operation and maintenance manual for 1:1 ... - imageevent

OPERATION AND MAINTENANCE MANUALFOR

1:1 REDUNDANT SWITCHOVER UNITMODELS:

The model number supplied is:

______ RSU-B______ RSU-S______ RSU-B/B______ RSU-S/S______ RSU-B/S

The following options have been supplied:

______ Option 15: 50 Ohm IF Impedance.______ Option 17A: RS422 Remote Interface.______ Option 17B: RS485 Remote Interface (Standard).______ Option 17C: RS232 Remote Interface.______ Option 17D: Contact Closure Remote Interface.______ Option 17F: IEEE-488 Interface.______ Option 17H: Ethernet Interface.

The MITEQ reference number is ___________

DRSUX00K128025P

Rev.K

ii

MANUAL REVISIONS

11/15/04: REV.J TO REV.K

ADDED "SECTION 3.3.3: ETHERNET INTERFACE" TO TABLE OF CONTENTS ANDSECTION THREE.

CHANGED "SECTION 3.3.2.10: REMOTE INTERFACE CONNECTION" TO "SECTION3.3.4" IN TABLE OF CONTENTS AND SECTION THREE

BLOCK 128025 REV. M TO REV. P; REVISED PARTS LIST AS PER CHANGEADDED OPTION 17H TO OPTIONS LIST ON COVER SHEET

iii

TABLE OF CONTENTS

SECTION 1

INTRODUCTION

Paragraph Page

1.1 GENERAL DESCRIPTION ............................................................................. 1-1

1.1.1 PHYSICAL .......................................................................................... 1-11.1.2 FUNCTIONAL ..................................................................................... 1-9

1.2 EQUIPMENT CHARACTERISTICS................................................................ 1-10

1.2.1 PHYSICAL .......................................................................................... 1-101.2.2 FUNCTIONAL ..................................................................................... 1-10

1.3 EQUIPMENT REQUIRED............................................................................... 1-12

1.3.1 EQUIPMENT SUPPLIED .................................................................... 1-121.3.2 EQUIPMENT REQUIRED BUT NOT SUPPLIED ................................ 1-12

SECTION 2

INSTALLATION

2.1 UNPACKING, STORAGE, RESHIPMENT ...................................................... 2-1

2.2 MOUNTING .................................................................................................. 2-1

2.3 TURN-ON PROCEDURE ............................................................................... 2-1

2.4 SYSTEM CONFIGURATION .......................................................................... 2-1

iv

TABLE OF CONTENTS (Cont.)

SECTION 3

OPERATION

Paragraph Page

3.1 INTRODUCTION ............................................................................................ 3-1

3.2 CONTROLS .................................................................................................. 3-1

3.2.1 EXTERNAL CONTROLS .................................................................... 3-13.2.2 INTERNAL CONTROLS...................................................................... 3-2

3.3 OPERATING PROCEDURE........................................................................... 3-4

3.3.1 LOCAL OPERATION .......................................................................... 3-4

3.3.1.1 Auto Mode ................................................................................. 3-43.3.1.2 Manual Mode ............................................................................. 3-4

3.3.2 REMOTE OPERATION....................................................................... 3-5

3.3.2.1 Contact Closure ......................................................................... 3-5

3.3.2.2 Remote Bus Option.................................................................... 3-53.3.2.2.1 Serial Bus ............................................................................. 3-53.3.2.2.2 IEEE-488 Bus ....................................................................... 3-5

3.3.2.3 RS232/422/485 Protocol ............................................................ 3-73.3.2.3.1 Message Format................................................................... 3-73.3.2.3.2 Header Byte.......................................................................... 3-73.3.2.3.3 Device Address Byte............................................................. 3-73.3.2.3.4 Command/Error Code........................................................... 3-83.3.2.3.5 Parameter Bytes ................................................................... 3-83.3.2.3.6 Trailer Byte ........................................................................... 3-83.3.2.3.7 Checksum Byte..................................................................... 3-8

3.3.2.4 Command Codes ....................................................................... 3-93.3.2.4.1 Set On-Line/Standby Status: Pa ........................................... 3-93.3.2.4.2 Return RSU/Converter Fault Status: Q ................................. 3-93.3.2.4.3 Return RSU Mode: R............................................................ 3-93.3.2.4.4 Return On-line/Standby Status: S ......................................... 3-103.3.2.4.5 Set RSU Mode: Ua ............................................................... 3-10

3.3.2.5 Programming Examples............................................................. 3-113.3.2.6 Device Address/Baud Rate Selection......................................... 3-113.3.2.7 RS485 Bus Termination ............................................................. 3-113.3.2.8 RS422 Bus Termination ............................................................. 3-11

v


SECTION 3

OPERATION

Paragraph Page

3.3.2.9 IEEE-488 ................................................................................... 3-123.3.2.9.1 Data Input Message Format.................................................. 3-12

3.3.2.9.1.1 Set On-line/Standby Status............................................. 3-123.3.2.9.1.2 Set RSU Mode ................................................................ 3-12

3.3.2.9.2 Data Output Message Format............................................... 3-143.3.2.9.2.1 RSU/Converter Fault Status Format................................ 3-143.3.2.9.2.2 RSU Mode Format .......................................................... 3-143.3.2.9.2.3 Converter On-line/Standby Status Format....................... 3-14

3.3.2.9.3 Service Request ................................................................... 3-153.3.2.9.4 Device Address/Service Request Enable.............................. 3-15

3.3.3 ETHERNET INTERFACE.................................................................... 3-16

3.3.3.1 Functional Description................................................................ 3-163.3.3.2 Ethernet Setup........................................................................... 3-163.3.3.3 Accessing the System................................................................ 3-173.3.3.4 Ethernet Firmware Upgrade....................................................... 3-233.3.3.5 Connection Without a Network................................................... 3-24

3.3.4 REMOTE INTERFACE CONNECTOR................................................ 3-27

3.4 EMERGENCY OPERATION........................................................................... 3-283.5 SHUTDOWN PROCEDURE........................................................................... 3-28

SECTION 4

PRINCIPLES OF OPERATION

4.1 INTRODUCTION ............................................................................................ 4-1

4.2 FUNCTIONAL DESCRIPTION........................................................................ 4-1

4.3 SUBSYSTEMS AND COMPONENTS FUNCTIONAL DESCRIPTION............ 4-3

4.3.1 CONTROL BOARD ASSEMBLY (A4A2) ............................................. 4-34.3.2 SWITCHES (A2A1, A5A1) .................................................................. 4-34.3.3 POWER SUPPLIES (A1A3, A1A6)...................................................... 4-44.3.4 RS232 REMOTE INTERFACE BOARD (A4A3)

(Option 17C: RS232 Remote Interface Only)...................................... 4-44.3.5 IEEE-488 REMOTE INTERFACE BOARD (A4A3)

(Option 17F: IEEE-488 Remote Interface Only).................................. 4-4

vi


SECTION 5

MAINTENANCE

Paragraph Page

5.1 INTRODUCTION ............................................................................................ 5-1

5.2 PREVENTIVE MAINTENANCE ...................................................................... 5-1

5.2.1 DC VOLTAGE..................................................................................... 5-15.2.2 INSERTION LOSS OF THE RSU........................................................ 5-1

5.3 CORRECTIVE MAINTENANCE ..................................................................... 5-2

5.3.1 POWER SUPPLY MALFUNCTION..................................................... 5-25.3.2 TRANSFER SWITCH MALFUNCTION ............................................... 5-2

SECTION 6

DIAGRAMS

6.1 INTRODUCTION ............................................................................................ 6-1

vii


TABLES

Number Page

1-1 Equipment Supplied........................................................................................ 1-121-2 Test Equipment Required But Not Supplied.................................................... 1-122-1 External Connections...................................................................................... 2-22-2 Standard Converter Configuration .................................................................. 2-35-1 Parts List - 1:1 Redundant Switchover Unit..................................................... 5-36-1 List of Diagrams.............................................................................................. 6-1

FIGURES

1-1 Front View, 1:1 Redundant Switchover Unit.................................................... 1-21-2 Rear View, RSU-S Redundant Switchover Unit .............................................. 1-31-3 Interior View, RSU-S Redundant Switchover Unit ........................................... 1-41-4 Rear View, RSU-B Redundant Switchover Unit .............................................. 1-51-5 Interior View, RSU-B Redundant Switchover Unit ........................................... 1-61-6 Rear View, RSU-X/X Redundant Switchover Unit ........................................... 1-71-7 Interior View, RSU-X/X Redundant Switchover Unit........................................ 1-83-1 1:1 Redundant Switchover Unit Front Panel Layout........................................ 3-33-2 Remote Bus Option ........................................................................................ 3-63-3 RS422/485 Bus Termination Jumpers ............................................................ 3-134-1 Block Diagram, Redundant Switchover Unit.................................................... 4-25-1 Test Setup for Channel Insertion Loss Measurement ..................................... 5-2

DIAGRAMS

6-1 Wiring Diagram (128009)................................................................................ 6-26-2 Schematic Diagram, Control Board Assembly (A4A2) .................................... 6-86-3 Assembly Diagram, Control Board Assembly (A4A2)...................................... 6-96-4 Schematic Diagram, RS232 Remote Interface Assembly

(A4A3), (RS232 Remote Option Only) ...................................................... 6-116-5 Assembly Diagram, RS232 Remote Interface Assembly

(A4A3), (RS232 Remote Option Only) ...................................................... 6-126-6 Schematic Diagram, IEEE-488 Remote Interface

Assembly, (A4A3), (IEEE-488 Remote Option Only) ................................. 6-146-7 Assembly Diagram, IEEE-488 Remote Interface

Assembly (A4A3), (IEEE-488 Remote Option Only) .................................. 6-15

APPENDIX

A Power Supply Manual (121897)...................................................................... 6-16

1-1

SECTION 1

INTRODUCTION

1.1 GENERAL DESCRIPTION

1.1.1 PHYSICAL

The following is a general description of the 1:1 Redundant Switchover Unit (RSU). The mainchassis houses all RF components, control circuitry and power supplies.

The chassis is 19" x 20" x 1.75" panel height. Slides are provided for mounting in a standard19" equipment rack.

The following items are found on the front of the unit:

• On/Off Power Switch, Power Supply A (A1A2)

• On/Off Power Switch, Power Supply B (A1A5)

• Alarm LED Power Supply A

• Alarm LED Power Supply B

• Alarm LED Converter A

• Alarm LED Converter B

• Alarm LED RSU

• Mode Select Switches

• Unit A/B On-line/Standby Status Select Switch

The following items are found on the rear of the unit:

• AC Voltage Input, Power Supply A (A1A1)

• Fuse, Power Supply A

• AC Voltage Input, Power Supply B (A1A4)

• Fuse, Power Supply B

• Coaxial Switch (A5A1) Inputs/Outputs (Supplied only for RSU-S and RSU-B/S)

• Coaxial Switch (A2A1) Inputs/Outputs (Supplied only for RSU-B, RSU-B/B andRSU-B/S)

• Converter A Alarm Input Connector, J7

• Converter B Alarm Input Connector, J8

• Remote Interface Connector, J9

• Remote Interface Connector, J10 (Optional)

• Ground Lug

• Address Select Switch (A4A6) (Option 17A, 17B, 17C, 17F)

1-2

Unit A/BOn Line/StandbySelect Switch

Alarms

ModeSelect

Switches

A1A2AC PowerOn/OffSwitch

Power Supply "A"

A1A5AC PowerOn/OffSwitch

Power Supply "B"

Figure 1-1. Front View, 1:1 Redundant Switchover Unit

#6612

1-3

Power Supply "B"AC VoltageInput/Fuse

J4AOff-LineOutput

Connector

J3Converter "A"

InputConnector

J7Converter "A"Alarm InputConnector

GroundLug

Power Supply "A"AC VoltageInput/Fuse

J3AConverter "B"

InputConnector

J4On-LineOutput

Connector

J8Converter "B"Alarm InputConnector

Figure 1-2. Rear View, RSU-S Redundant Switchover Unit

#6612

J9Remote

InterfaceConnector

(Option 17 Only)

J10Remote

InterfaceConnector

(Option 17A,17B Only)

A4A6AddressSelect

(Options 17A, B, C, F

Only)

#6612

1-4 Figure 1-3. Interior View, RSU-S Redundant Switchover Unit

A1A1

A1A4

A5A1

A4A4

A1A3

A4A2

A4A5Options 17A,

17B, 17D Only)

A1A6

A1A5

A1A2

A4A3(Options17C, 17F

Only)

1-5 Figure 1-4. Rear View, RSU-B Redundant Switchover Unit

#6612

Power Supply "A"AC VoltageInput/Fuse

Power Supply "B"AC VoltageInput/Fuse

GroundLug



J9Remote

InterfaceConnector

(Option 17 Only)

J10Remote

InterfaceConnector

(Options 17A, B Only)

J2AOff-LineOutput

Connector

J2On-LineOutput

Connector

J1Converter "A"

InputConnector

J1AConverter "B"

InputConnector

A4A6AddressSelect

(Options17A, B, C, F

Only)

1-6 Figure 1-5. Interior View, RSU-B Redundant Switchover Unit

#6612

A2A1

A1A3

A4A5(Options 17A,

17B, 17D Only)

A1A4

A1A1

A1A6

A1A5

A1A2

A4A3(Options17C, 17F

Only)

A4A2

A4A4

J9Remote

InterfaceConnector(Option 17

Only)

J10Remote

InterfaceConnector

(Option 17A,17B Only)

1-7

GroundLug

Power Supply "A"AC VoltageInput/Fuse Power Supply "B"

AC VoltageInput/Fuse

J4AOff-LineOutput

Connector

J3Converter "A"

Input Connector J1Converter "A"

Input Connector

J3AConverter "B"

Input Connector

J1AConverter "B"

Input Connector



J2AOff-LineOutput

Connector

J4On-LineOutput

Connector

J2On-LineOutput

Connector

A4A6AddressSelect(Options17A, B, C,F Only)

#6612

Figure 1-6. Rear View, RSU-X/X Redundant Switchover Unit

1-8 Figure 1-7. Interior View, RSU-X/X Redundant Switchover Unit

#6612

A1A2

A4A3(Options 17C,

17F Only)

A4A2

A1A5

A1A1

A1A4

A5A1

A2A1

A4A4

A1A3A4A5

(Options 17A,17B, 17D Only)

A1A6

1-9

1.1.2 FUNCTIONAL

The 1:1 Redundancy Switching Unit (RSU) is used with two converters, one on-line and thesecond in standby mode. A fault condition in the on-line converter, or an operator generatedcommand, will switch the standby converter into the transmission path and switch the failedconverter off-line.

The unit is equipped with fully redundant power supplies and is available with remote businterface options for remote line control and monitoring.

The 1:1 RSU design ensures continuous operation allowing a fault to be repaired and/or routinemaintenance of a converter to be performed without disruption of signal transmission.

With the exception of the Remote Contact Closure and No Remote options, the RSU stores allinformation in non-volatile memory. If power is lost, the RSU will return to its original settingswhen power is restored. For Contact Closure and No Remote installed the default settings areas follows:

Option Power On Settings

Remote Contact Closure REMOTE, AUTO

No Remote LOCAL, AUTO

1-10

1.2 EQUIPMENT CHARACTERISTICS

1.2.1 PHYSICAL

A. Weight: 30 pounds

B. Overall Dimensions: 19" x 20" x 1.75" panel height

C. Signal Connectors (J3, J3A, J4, J4A): SMA femaleBNC female (RSU-B/B)SMA female (RSU-S/S)

D. Signal Connectors (J1, J1A, J2, J2A): BNC female

E. Remote Interface Connectors (J9, J10) -

1. RS422/485: DEM-9S

2. RS232: DEM-25P

3. Contact Closure: DEM-25S

4. IEEE-488: IEEE receptacle

F. Converter Alarm Input Connectors (J7, J8): DEM-9P

G. Primary Power Input: IEC-320

1.2.2 FUNCTIONAL

A. Frequency Range -

ModelNumber

J1, J1A, J2, J2AFrequency

J3, J3A, J4, J4AFrequency

RSU-B 50-180 MHz -RSU-S - 0.95-18.4 GHz

RSU-B/B 50-180 MHz 50-180 MHzRSU-B/S 50-180 MHz 0.95-18.4 GHzRSU-S/S 0.95-11.4 GHz 0.95-18.4 GHz

B. RF Specifications -

Frequency Insertion Loss(max.)

AmplitudeFlatness/40 MHz

(max.)

Return Loss(min.)

Isolation(min.)

50-180 MHz 0.2 0.2 23 800.95-6.5 GHz 0.3 0.2 18 606.5-8.4 GHz 0.4 0.2 18 608.4-14.8 GHz 0.45 0.2 16 60

14.8-18.4 GHz 0.6 0.4 12 55

1-11

C. Primary Power: 100, 120, 220, 230/240 VAC(Selectable at rear panel)

D. DC Test Points (Internal) -

1. Power Supply A: +20.5 ±0.2V, +5.35 ±0.25V

2. Power Supply B: +20.5 ±0.2V, +5.35 ±0.25V

E. Alarm Input Connector (J7, J8) Pin Designations -

1. Converter Fault: Contact Closure of pins 1 and 2

2. Converter Normal: Contact Open of pins 1 and 2

1-12

1.3 EQUIPMENT REQUIRED

1.3.1 EQUIPMENT SUPPLIED

Table 1-1 lists the equipment supplied with each system.

TABLE 1-1

EQUIPMENT SUPPLIED

ITEM DESCRIPTION QUANTITY1 1:1 Redundant Switchover Unit 12 AC Voltage Line Cord 23 DEM-9S Connector 24 Remote Interface Connector 1 or 25 Slides 1 Pair

1.3.2 EQUIPMENT REQUIRED BUT NOT SUPPLIED

Table 1-2 lists the equipment required for periodic maintenance and calibration of theswitchover unit.

TABLE 1-2

TEST EQUIPMENT REQUIRED BUT NOT SUPPLIED

ITEM DESCRIPTION QUANTITY1 Wiltron 6648A Sweep Generator (10 MHz-20 GHz) 22 Wiltron 560A Scalar Network Analyzer 13 Hewlett Packard 8495B/8494B Step Attenuator

(0-81 dB)1

4 Wiltron 60N50 VSWR Bridge (10-2000 MHz) 15 Wiltron 64A50 VSWR Bridge (2-8 GHz) 16 Wiltron 69A50 VSWR Bridge (8-18 GHz) 17 W and G RM4 Radio Link Measuring Set 18 Hewlett Packard 8566B Spectrum Analyzer 19 Hewlett Packard 8970 Noise Figure Meter 1

10 EIP 545A Microwave Frequency Counter 111 Hewlett Packard 436A Power Meter 112 Hewlett Packard 8405A Vector Voltmeter 113 Phillips PM3215 Oscilloscope 114 Compaq Portable Computer 115 SEL 488-2000, RS-232 to IEEE 488 Adapter 116 Fluke 6160B Reference Synthesizer 117 Fluke 77 Digital Multi-Meter 1

2-1

SECTION 2

INSTALLATION

2.1 UNPACKING, STORAGE, RESHIPMENT

Carefully open the shipping container and remove the equipment. Weight of the RSU isapproximately 20 pounds. Inspect the equipment thoroughly and report any damage.

If the equipment is to be stored, it should be wrapped in plastic and kept in a clean, dry place.

If the equipment is to be reshipped for any reason, wrap in heavy plastic and ship in a heavy(275 lb. test) double-wall carton. At least three inches of a solid packing material should beused on all sides of the converter. The carton should be marked to indicate that it containsfragile electronic equipment.

2.2 MOUNTING

THIS EQUIPMENT IS NOT FOR USE IN A DOMESTIC ENVIRONMENT.

THIS EQUIPMENT IS INTENDED FOR RACK MOUNTING.

OPERATOR INJURY MAY OCCUR IF UNIT IS NOT PROPERLY MOUNTED.

THIS EQUIPMENT MUST BE SECURELY MOUNTED.

Slides are provided for mounting in a standard 19" equipment rack.

2.3 TURN-ON PROCEDURE

After mounting, make all external connections per Table 2-1. Refer to section 3.4 for propersystem configuration. Refer to Section 1 for the physical configuration of the RSU.

Apply power to the RSU by depressing the front panel power On/Off switches.

Power Supply fault and RSU fault lights should be off.

System is now operational.

2.4 SYSTEM CONFIGURATION

Refer to Table 2-2 for Standard Converter Configurations.

2-2

TABLE 2-1

EXTERNAL CONNECTIONS

1 Attach power cord to AC socket (A1A1, A1A4).2 Connections for specific system configurations are shown in Section 2.4.3 Connect redundancy switch outputs of converter "A" to J7 and converter "B"

to J8.4 Connect remote interface to J9, J10 (Optional).

3-1

SECTION 3

OPERATION

3.1 INTRODUCTION

The following paragraphs describe the controls, adjustments and procedures for turn on,operation, emergency operation and shut down of the RSU.

3.2 CONTROLS

3.2.1 EXTERNAL CONTROLS (Figures 1-1 and 1-2)

A. On/Off switches (A1A2, A1A5) apply AC power to the RSU.

B. Fuses (A1A1, A1A4): 3.0A for 120VAC (1.5A for 220VAC).

C. AC Power Selection (A1A1, A1A4)

Voltage input is selected using a card located below the fuse on the AC input connector. Theselected voltage input is indicated on the installed card. To change the voltage input, pull thecard out and replace it with the desired voltage facing out. The card can be used to set the ACinput voltage to 100, 120, 220 or 240 VAC.

D. Mode

The yellow LEDs indicate RSU mode. Pressing AUTO/MANUAL switches the RSU betweenAUTO and MANUAL (LOCAL mode only). Pressing LOCAL/REMOTE always switches theRSU between LOCAL and REMOTE mode.

E. Converter A/B, On-line/Standby

On-line/Standby status of each converter is indicated by the green and yellow LEDs. Pressingthe On-line/Standby switch toggles the status of Unit A and Unit B if the RSU is inLOCAL/MANUAL mode. One unit is always on-line and the other on standby.

F. Alarms

The red LEDs indicate a fault in Unit A, Unit B, Power Supply A, Power Supply B and the RSU.The RSU LED will turn on for the following conditions:

• Transfer switch in the wrong position• Power supply fault• RSU circuit board fault

3-2

3.2.2 INTERNAL CONTROLS (Figure 1-3)

A. Power Supply Voltage Adjustment (A1A3, A1A6)

Adjustment of the power supplies (A1A3, A1A6) within the specified tolerances may be madeusing an insulated tuning tool (refer to Appendix).

PowerSupply

Setting Tolerance

"A" (A1A3) 20.5 V ±0.25 V5.35 V ±0.2 V

"B" (A1A6) 20.5 V ±0.25 V5.35 V ±0.2 V

3-4

3.3 OPERATING PROCEDURE

Follow the Turn-On Procedure in Section 2.3.

Make all external connections as per Table 2.1.

In the event of a fault in one of the power supplies used in the system, a fault LED indicator onthe front panel will light. In the event of a fault, consult corrective maintenance, Section 5.3.1, todetermine possible cause and/or remedies.

The "RSU" alarm LED indicator will light if either a power supply fault occurs or a transfer switchis in the incorrect position. If power supply fault has occurred consult corrective maintenance,Section 5.3.1, to determine possible cause and/or remedies. If a power supply fault has notoccurred consult corrective maintenance, Section 5.3.2.

3.3.1 LOCAL OPERATION

The operating modes are selected from the front panel or over the optional remote bus.

3.3.1.1 Auto Mode

In this mode the On-line/Standby status of Units A and B is automatically controlled by the RSUwithout operator intervention. The On-Line/Standby status of Units A and B (position of thetransfer switch) is changed when a fault is detected from the On-line unit. Control of converterstatus is locked out from the front panel and the remote bus.

3.3.1.2 Manual Mode

On-Line/Standby status of Units A and B is controlled from the front panel (LOCAL Mode) or theremote bus (REMOTE mode). Converter faults are still monitored by the RSU but have noeffect on the On-Line/Standby status.

3-5

3.3.2 REMOTE OPERATION

On-Line/Standby status and Auto/Manual mode are selected from the remote bus. The frontpanel is locked out with the exception of the LOCAL/REMOTE switch.

3.3.2.1 Contact Closure

Form C relay contacts are provided at the rear panel REMOTE connector and indicate RSUstatus, mode and alarm settings. When set to REMOTE mode, RSU status andAUTO/MANUAL mode may be set by momentarily or continuously shorting pins on theREMOTE connector (see REMOTE INTERFACE CONNECTOR).

3.3.2.2 Remote Bus Option

In this configuration a System Controller is used to control the converters and RSU (see Figure3). The Remote Bus options consist of several serial bus options (RS232/422/485) and theIEEE-488 bus option.

3.3.2.2.1 Serial Bus

When polled the RSU will respond with Mode, Status or Fault Status information in eitherLOCAL or REMOTE mode. On-line/Standby status and AUTO/MANUAL mode are set from theSystem Controller only when the RSU is in REMOTE mode.

3.3.2.2.2 IEEE-488 Bus

When addressed to talk, the RSU will respond with Mode and Status information in eitherLOCAL or REMOTE mode. When addressed to listen, the RSU will accept data only inREMOTE mode.

3-7

3.3.2.3 RS232/422/485 Protocol

All transmissions are multi-byte sequences beginning with a header byte and ending with atrailer byte and checksum byte. The transmitted bytes are all ASCII printable characters in therange of 20H to 7AH.

Data transmission format is a 10 bit sequence consisting of 1 Start, 7 Data, 1 Parity and 1 Stopbit. Odd or Even parity is set from the rear panel ADDRESS DIP switch. All characters,including the checksum character, are checked for parity. If any character in the message has aparity, framing or overrun error, the entire message is ignored and no response is made by theconverter.

The RSU continually monitors the communications bus and will accept all messages addressedto it even when in LOCAL mode. When in LOCAL mode, receipt of any messages other thanFault Status, On-line/Standby Status and Mode will be ignored and the RSU will respond withan error code.

3.3.2.3.1 Message Format

The general message format is as follows:

HEADER - DEVICE ADDRESS - COMMAND/ERROR CODE -PARAMETERS (if required) - TRAILER - CHECKSUM

The response time from Message to acknowledge is 100 ms. maximum.

Since all bytes are ASCII printable characters, a compatible terminal may be used to control theRSU or monitor traffic on the communication bus.

3.3.2.3.2 Header Byte

The Header Byte is 7BH, ASCII character "{".

3.3.2.3.3 Device Address Byte

The Device Address may take on the values from 40H to 5FH (thirty-two possible addresses).

3-8

3.3.2.3.4 Command/Error Codes

Command CodesCode ASCII Character Function50H,3nH

Pn Set On-line/Standby Status

51H Q Return RSU/Converter Fault Status52H R Return RSU Mode53H S Return On-line/Standby Status55H U Set RSU Mode

Error CodesCode ASCII Character Function61H a Command not recognized62H b Illegal parameter or parameter out of range63H c RSU in Local mode64H d Busy

3.3.2.3.5 Parameter Bytes

Parameters are numeric characters. Non-numeric parameters such as ",", "." or values beyondthe range of the RSU will be rejected and cause the RSU to respond with error code "b".

3.3.2.3.6 Trailer Byte

The Trailer byte is 7DH, ASCII character "}".

3.3.2.3.7 Checksum Byte

The Checksum byte is the sum modulo 95 of all message characters beginning with the headerbyte up to and including the trailer byte.

The value 32 is subtracted from each character value before taking the modulo 95 sum. Thevalue 32 is added to the final sum to obtain the Checksum value. All values are in decimal.

Checksum = Mod [(Character Value - 32), 95] +32

3-9

3.3.2.4 Command Codes

The following paragraphs describe each of the command codes.

3.3.2.4.1 Set On-line/Standby Status: Pa

The RSU responds to the set command in Remote mode only.

Remote Command Sequence: PaRSU Response: P

P: Command indicatora = 0 - B On-line, A Standbya = 1 - A On-line, B Standby

3.3.2.4.2 Return RSU/Converter (Units A and B) Fault Status: Q

The RSU responds in both Local and Remote mode.

Remote Command: QRSU Response: Qabc

0 = Normal1 = Fault

Q: Command indicatora = Unit Ab = Unit Bc = RSU

3.3.2.4.3 Return RSU Mode: R


Remote Command: RRSU Response: Rab

R: Command indicatora = 0 - Remotea = 1 - Localb = 0 - Manualb = 1 - Auto

3-10

3.3.2.4.4 Return On-line/Standby Status: S


Remote Command: SRSU Response: Sa

S: Command indicatora = 0 - B On-line, A Standbya = 1 - A On-line, B Standby

3.3.2.4.5 Set RSU Mode: Ua

The RSU responds to the set command in Remote mode only.

Remote Command Sequence: UaRSU Response: U

U: Command indicatora = 0 - Manuala = 1 - Auto

3-11

3.3.2.5 Programming Examples

The RSU address is 40H (ASCII code for @). The following are typical commands andresponses showing the ASCII printable characters.

A. Set the RSU mode to AUTO.

Controller Command RSU Response{@U1}! {@U}o

B. Return the RSU/Converter Fault status. The response indicates a fault in the RSU.

Controller Command RSU Response{@Q1}k {@Q001}=

C. Set the On-line/Standby status. The response indicates the RSU is in LOCAL modeand will ignore the command.

Controller Command RSU Response{@P1}{ {@c}}

3.3.2.6 Device Address/Baud Rate Selection

The device address is set with the ADDRESS DIP switch on the rear panel. S1, 2, 3, 4 and 5select the five LSBs of the address in binary (switch Off = "1", switch On = "0", S1 = LSB). Thetwo MSBs are permanently set to "10" and not available to the user.

The baud rate and parity are selected with switches S6, 7 and 8 in the following code (switch Off= "1", switch On = "0").

S8 S7 Baud Rate0 0 12000 1 24001 0 48001 1 9600

S6 Parity0 Even1 Odd

3.3.2.7 RS422 Bus Termination (Figure 3-2)

A jumper selectable, 120 ohm termination resistor is connected across the DATA IN +/- andDATA OUT +/- terminals. Installing E1 places the resistor across the DATA OUT terminals andE2 across the DATA IN terminals.

3.3.2.8 RS485 Bus Termination (See Figure 3-2)

A jumper selectable, 120 ohm termination resistor is connected across the DATA +/ DATA -terminals. Installing E1 places the resistor across the terminals.

3-12

3.3.2.9 IEEE-488 Control

The RSU performs the basic Talker and Listener functions as specified in IEEE Standard 488.It is also capable of sending a Service Request to the IEEE-488 Controller and will respond witha status word when the Serial Poll Enable message is received.

3.3.2.9.1 Data Input Message Format

The messages to and from the RSU are ASCII character strings terminated with CR, LF andEOI.

3.3.2.9.1.1 Set On-line/Standby Status

This message sets the on-line/standby configuration of Units A and B. The unit must be inMANUAL mode to respond to this command.

Pa

a = 0 - B On-line, A Standbya = 1 - A On-line, B Standby

3.3.2.9.1.2 Set RSU Mode

This message sets the RSU mode.

Ua

a = 0 - Manuala = 1 - Auto

3-14

3.3.2.9.2 Data (Output Message) Format

These messages determine the RSU's response when it is addressed to talk by the IEEE-488Controller. A Data Format message remains in effect until another one is received. DQ is thepower on default format.

3.3.2.9.2.1 RSU/Converter Fault Status Format

Data Format RSU ResponseDQ Qabc

0 = Normal1 = Fault

Q: Fault status format indicatora = Converter Ab = Converter Bc = RSU

3.3.2.9.2.2 RSU Mode Format

Data Format RSU ResponseDR Rab

R: Mode format indicatora: 0 = Remote, 1 = Localb: 0 = Manual, 1 = Automatic

3.3.2.9.2.3 Converter On-line/Standby Status Format

Data Format RSU ResponseDS Sa

S: Converter on-line/standby status format indicatora: 0 = A Standby, B On-line 1 = A On-line, B Standby

3-15

3.3.2.9.3 Service Request

The RSU will issue a service request (activate the SRQ line) when a fault is detected in theRSU. The fault may be caused by a power supply problem, transfer switch failure or circuitboard failure.

The IEEE-488 Controller responds by sending the SPE message (Serial Poll) and addressesthe RSU to talk. The RSU responds with the following message:

Bit No.7 6 5 4 3 2 1 00 1 0 0 0 S2 S1 S0

S0/1 indicates which component caused the service request by setting the appropriate bit to 1.

S0: Power SupplyS1: Transfer switch or RSU circuit board

3.3.2.9.4 Device Address/Service Request Enable

The device address is set with the ADDRESS DIP switch on the rear panel. S1, 2, 3, 4 and 5select the address assignment in binary (switch Off = "1", On = "0", S1 = LSB). Switch 8enables the Service Request feature (switch Off = Disabled, On = Enabled). S6, 7 are spares.

3-16

3.3.3 ETHERNET INTERFACE

3.3.3.1 FUNCTIONAL DESCRIPTION

The MITEQ RSU can be equipped with an Ethernet Interface (Option 17H) feature permittingcontrol and monitoring via a 10 or 100 Mbps Ethernet connection. Available interface protocolsare HTTP (web access), SNMP (Simple Network Management Protocol), and Telnet.

The use of standard protocols makes it possible to provide (password-protected) access to theconverter from any location in the world where an internet connection is available

3.3.3.2 ETHERNET SETUP

Connection

The Converter must be connected to the facility Local Area Network (LAN) network via anindustry-standard 10baseT RJ45 cable. The cable should be a “direct” cable, not a “crossover”cable. The Converter may also be connected directly to a PC without a LAN. (See below fordetails)

Configuring Internet Protocol (IP) Operating Parameters

An Internet Protocol (IP) address and associated parameters must be configured in the unit sothe controlling device can address it. Normally, the individual or organization managing thefacility’s LAN assigns this address. (See below for information on connecting directly to a PCwithout a Local Area Network). Three parameters will be required:

IP Address (Factory Setting 192.168.1.1)Subnet Mask (Factory Setting 255.255.255.0)Gateway (Factory Setting 0.0.0.0)

Note: Factory setting IP address is assigned at time of final testing of the converter. The defaultIP is recorded on the Final Test Data Sheet for the unit. Unique MAC addresses are providedand recorded on the basis of serial number at MITEQ.

To change Ethernet IP settings, run Netburner IPsetup, (which is available from MITEQ uponrequest). This program does not rely on IP settings to communicate. It can see MITEQequipment regardless of the Subnet and Masking settings of the PC and the unit.

3-17

The right hand column shows a list of all MITEQ Ethernet devices that are on the same Subnetas your PC. The left hand column shows the IP settings for the selected unit.

To change the IP settings, select a unit from the right hand column, and modify the IP settingsunder the header NDK Settings. Click the Set button to enforce the changes. The unit will resetitself, and come back on the network a few seconds after that.

Note: Some networks are set up to block this program. If your network blocks this, then youmust change the network settings or connect your PC directly to the unit (see Section 3.3.3.5).

Verifying Proper Connection and Configuration

The connection and configuration may be verified from a PC attached to the LAN using thenetwork “ping” command. From a command prompt, enter

“ping <assigned IP address>”

The response will indicate whether a connection was established.

3.3.3.3 ACCESSING THE SYSTEM

Access via the Web Interface

All system settings may be may be queried or modified via the Web Interface. The web pagedesigns have been optimized for the use with the Microsoft Internet Explorer (MSIE) Version 5.0web browser, or higher. Use of Cookies must be enabled (see the TOOLS|INTERNETOPTIONS|PRIVACY setting).

Web access may function properly, or with somewhat degraded performance, using otherbrowsers of the same vintage. Browsers of earlier vintage are not recommended.

To connect to the Converter, launch the web browser on any PC connected to the same LAN,and enter the address

http://<assigned IP address>

A sign-on page requesting the password should be displayed. (See below for information onconfiguring for access to the Converter by name instead of IP address). The default passwordis “11111”.

3-18

Once logged in the home page will appear.

The Manual/Auto Status, Remote/Local Status, and Alarm Status, will appear on all of theremaining pages.

The operator may navigate between the available pages by clicking on the links labeled “Home”,“Comms”, “Misc”, and “Log Out”.

From the home page the Auto/Manual status can be changed, and the Online/Standby Statuscan be changed if in Manual Mode.

3-19

To set an operating parameter, make the appropriate changes, change the (screen locked)pull-down to UNLOCKED, and press the Submit or other applicable button.

THE COMMUNICATIONS PROVIDES ACCESS TO THE COMMUNICATION SETTINGS OFTHE UNIT. CHANGING THE IP SETTINGS WILL DISRUPT THE SESSION AND THEOPERATOR WILL BE REQUIRED TO RECONNECT TO THE UNIT AT THE NEW SETTINGS.THESE CAN BE SET FROM THE FRONT PANEL. SNMP PARAMETERS CAN ALSO BEDEFINED FROM THIS PAGE. THE TABLE BELOW DESCRIBES THE FIELDS ON THECOMMUNICATIONS PAGE.

3-20

COMMUNICATIONS PAGE FIELDSIP Address View or set the system IP address (changing this value will

reset the system)IP Subnet Mask View or set the system IP Subnet Mask (changing this value

will reset the system)IP Gateway View or set the system IP Gateway (changing this value will

reset the system)System Contact View or set the SNMP System Contact parameterSystem Name View or set the SNMP System Name parameterSystem Location View or set the SNMP System Location parameterRead Community View or set the SNMP Read Community parameter (enter a

long arbitrary string to make SNMP inaccessible)Write Community View or set the SNMP Write Community parameter (enter a

long arbitrary string to make SNMP inaccessible)

3-21

The following table describes the fields on the Miscellaneous Page.

MISCELLANEOUS PAGE FIELDSSecond BetweenAlarm Updates

View or set how frequently the alarm indications will berefreshed on the Logs page

Enable FirmwareUpgrade

Permit or prevent remote upgrade of the converter Ethernetfirmware.

Enable Telnet Permit or prevent Telnet accessOld PasswordNew PasswordNew Password

Update the system password (1-5 digits). All three values mustbe entered. If the old password does not match the existingpassword, or the two new password entries are different, theupdate will not occur.

Send a Test Trap Check this box and press Submit to send a single SNMP testtrap

3-22

Pressing the Logout button will end the session and the following page will appear on thebrowser.

3-23

Access via SNMP

The Converter may be accessed and monitored via the Simple Network Management Protocol(SNMP). SNMP is designed for control of network elements from a central management point.

The SNMP Management Information Base (MIB) file for the system, available from MITEQdefines the specifics of the interface. This file is read by the chosen SNMP management tool toprovide an “understanding” of the interface. The MIB file is in a format that can be ready withany text editor. Do NOT modify this file.

SNMP operating parameters may be set on the COMMS web page. If SNMP operation is notdesired, this feature may be rendered inaccessible by inserting a long arbitrary string in theRead Community and Write Community fields.

Access via Telnet

The Converter may be accessed via Telnet. There is no special protocol on the Telnet channel;the Converter will expect the same commands, and offer the same replies, as via the serial port.

Telnet access must first be enabled on the COMMS web page. If not being used, it isrecommended that it be left disabled for security reasons.

When a Telnet connection is established, the Converter will request the password, which shouldbe sent in the standard MITEQ wrapper (‘{‘<address byte (ignored)><password>’}’<checksumbyte>). The connection will be refused if a user is already logged in via the web interface.

Once the connection is established, standard serial commands may be sent and responses willbe received. Logout is automatic when the Telnet connection is broken.

COMMON ERROR MESSAGES:

“{AUNAVAILABLE (1)}F” Telnet connection was refused because Telnet is disabled. Go tothe web interface (page labeled misc.htm) to enable it.

“{AUNAVAILABLE (2)}G” Telnet connection was refused because a user is already loggedinto the web interface.

3.3.3.4 ETHERNET FIRMWARE UPGRADE

Instructions on how to use the firmware update program:

• Install AutoUpdate and copy the s19 file to your computer. Make a note of whereyou save the file.

• Start AutoUpdate.exe.• Find the Converter. Click the "Find..." button, it will show a list of Ethernet-based

Converters that are available for reprogramming. Highlight the converter you wishto reprogram and click "OK".

• Select the s19 file for uploading to the converter. Click "Browse..." and select thefile DBRSU_APP.s19. It is the other file that was extracted from the zip file.

• Check the box that reads "Reboot When Complete."• Start the update process. Click "Update." There will be a message box that reports

if it successfully completed or not. Successful programming takes approximately 30seconds, unsuccessful programming can take 2 minutes to time out.

After the upgrade, it will be necessary to log in again. The new firmware version will be visibleon the login page.

3-24

3.3.3.5 CONNECTING WITHOUT A NETWORK

For testing, familiarization, or configuration, the Converter may be connected to a PC without aLAN. This may be done two ways:

• Connect via an Ethernet hub, using standard cables• Connect directly using a single, reversing cable

In this configuration, the PC must be configured with a Static IP address. The procedure for thisvaries between OS types and versions. Consult the operating manual or help files availablewith the computer to be used to determine the proper procedure.

The computer must be configured with the same Subnet Mask, but a different IP address, toconnect properly. For connecting with the converter as shipped from the factory, the followingsettings are recommended:

IP Address 192.168.1.2Subnet Mask 255.255.255.0Gateway 0.0.0.0

Note: Factory setting IP address is assigned at time of final testing of the converter. Thedefault IP is recorded on the Final Test Data Sheet for the unit. Unique IP addresses areprovided and recorded on the basis of serial number at MITEQ.

Both standard and reversing cables are widely available. The following chart is provided forassembling cables if desired, or for identifying a specific cable type:

Direct Cable Wiring1 wh/or 12 or 23 wh/gn 34 bl 45 wh/bl 56 gn 67 wh/br 78 br 8

Crossover Cable Wiring1 wh/or 32 or 63 wh/gn 14 bl 45 wh/bl 56 gn 27 wh/br 78 br 8

3-25

Reaching the Converter by NAME instead of IP address

If the Converter is connected to a LAN equipped with a Domain Name Server, the networkmanager may be able to configure the server to associate a particular text name with an IPaddress. If this is not the case and addressing by name is desired, machines equipped withMicrosoft Windows may be configured for this capability.

Locate the “hosts” file on the PC to be configured. Some common locations for the host’s fileare:

Windows XP: C:\WINDOWS\SYSTEM32\DRIVERS\ETCWindows 2K: C:\WINNT\SYSTEM32\DRIVERS\ETCWin 98\ME: C:\WINDOWS

The hosts file is a plain-text file of the form:

<ip address> <associated name>

Add the desired address/name pair(s) to the list. Generally, it is a good idea to back up anysystem file before modification. An example host file is provided here:

216.239.39.99 google.com127.0.0.1 localhost192.168.1.1 miteq9700_1192.168.1.2 miteq9700_2

In some cases, it may be necessary to reboot the PC before changes to the host file take effect.

Other Operating Systems may use a different mechanism. Consult the appropriatedocumentation to change host settings.

3-26

ETHERNET GLOSSARY

10-baseT Controlled-impedance cable used for Ethernet wiringCrossover Cable An Ethernet cable wired with the signal pairs reversed, to

permit connection of two computer devices.Direct Cable An Ethernet cable wired with the signal pairs directly

connected, to permit connection between a computer andhub or router

FTP File Transfer Protocol, a protocol for moving files betweencomputers via a TCP/IP connection

Gateway An IP setting parameter that indicates how a device mayconnect to other devices that are not a member of theimmediate subnetwork.

HTTP Hypertext Transport Protocol. The standard protocol formoving web pages between servers (e.g. the Converter)and clients (e.g. the web browser).

Hub A component used to connect several Ethernet-equippeddevices together.

IP Address Internet Protocol address. A unique address used toidentify and connect to a device.

LAN Local Area Network. A means (usually, but not alwaysEthernet) for connecting multiple computing devicestogether for high-speed communications.

IP Internet Protocol. Specifies an organization of datapackets sent between computers for networkcommunications.

MSIE Microsoft Internet Explorer, the web browser integratedwith most versions of Microsoft Windows. The Converterinterface design was optimized for operation with MSIE 5.0or higher

RJ45 The standard telephone-style connector used forterminating twisted-pair Ethernet cables.

SNMP Simple Network Management Protocol, a system ofcommunication between managed network elements (e.g.the Converter), and a network control program, e.g. HPOpenview.

Subnet Mask A numeric mask defining the size of a subnetwork. Bitscleared in the mask define IP addresses that maycommunicate on the subnetwork.

TCP Transmission Control Protocol. Specifies a mechanism forestablishing a virtual connection between networkelements, usually via IP

Telnet A simple mechanism for communicating between twodevices via TCP. A connection is opened between thedevices, and bytes may then pass freely between them, aswith a serial connection.

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3.3.4 REMOTE INTERFACE CONNECTOR

RS232 - D subminiature connector, 25 conductor, male.

J9-1 Ground-2 TX Data-3 RCV Data-7 Ground

RS422 - Two D subminiature connectors, 9 conductor, female. J9 and J10 are internallyconnected together

J9-1 Ground-3 Data Out --5 Data In --7 Data Out +-9 Data In +

RS485 - Two D subminiature connectors, 9 conductor, female. J9 and J10 are internallyconnected together

J9-1 Ground-3 Data --7 Data +

IEEE-488

IEEE-488 compatible 24 contact connector (receptacle).

3-28

Contact Closure - D subminiature connector, 25 conductor, female.

Command Close Common OpenA On-line/B Standby 3 2 1B On-line/A Standby 1 2 3AUTO 6 5 4MANUAL 4 5 6

Status, Alarms Close Common OpenA On-line/B Standby 9 8 7B On-line/A Standby 7 8 9LOCAL 12 11 10REMOTE 10 11 12AUTO 16 15 14MANUAL 14 15 16RSU Normal 19 18 17RSU Fail 17 18 19Converter A Normal 22 21 20Converter A Fail 20 21 22Converter B Normal 25 24 23Converter B Fail 23 24 25Signal/Frame Ground 13

3.4 EMERGENCY OPERATION

In the event of a failure in RSU components, refer to Section 5 to determine possiblecause/remedies.

3.5 SHUTDOWN PROCEDURE

The RSU is completely shut down when the AC power is removed.

4-1

SECTION 4

PRINCIPLES OF OPERATION

4.1 INTRODUCTION

The following paragraphs provide information on the principles of operation of the MITEQ 1:1Redundant Switchover Unit. Overall functional operation of the system is discussed inParagraph 4.2 and detailed principles of operation for the individual subassemblies arepresented in Paragraph 4.3.

4.2 FUNCTIONAL DESCRIPTION

The 1:1 Redundant Switchover Unit (RSU) is used with two converters, one on-line (ConverterA) and the second in standby mode (Converter B). A fault condition in the on-line Converter A,or an operator generated command, will physically remove Converter A's input/output signallines and connect them to the standby Converter B.

The unit is equipped with fully redundant power supplies and is available with remote businterface options for off-line control and monitoring.

Its design ensures continuous operation, allowing a fault to be repaired and/or routinemaintenance of a converter performed without disruption of signal transmission.

With the exception of the Remote Contact Closure and No Remote options, the RSU stores allinformation in non-volatile memory. If power is lost, the RSU will return to its original settingswhen power is restored. For Contact Closure and No Remote installed the default settings areas follows:

Option Power On Settings

Remote Contact Closure REMOTE, AUTO

No Remote LOCAL, AUTO

Current RevisionAs of 11/15/2004 11:33:07 AMdglover

Page of1 1

4-3

4.3 SUBSYSTEMS AND COMPONENTS FUNCTIONAL DESCRIPTION

4.3.1 CONTROL BOARD ASSEMBLY (A4A2)

The Control board assembly contains the microcomputer and analog circuitry necessary tocontrol the front panel indicators, accept data from the front panel keys, monitor switchpositions, and provide a remote bus interface.

The microcomputer is designed with a microprocessor which contains on-chip RAM, a serialport and an I/O port. Program memory is stored in a EPROM. An additional RAM is located inthe peripheral IC along with I/O ports and a timer. The I/O ports read the rear panel DIP switchfor address and baud rate selection (remote bus option only), control the "AUTO", "MANUAL","LOCAL", "REMOTE", and "RSU" front panel LEDs, and monitor the DC voltage alarm circuitry.The on-chip timer is used as a gated oscillator to sound the buzzer.

The I/O port on the microprocessor stores and recalls data from the EPROMs (non-volatilememory). When the remote bus option is used, the microprocessor's on-chip serial I/O port isused with the interface ICs to provide an RS422/485 interface.

Front panel keys are monitored by the keyboard encoder. The keys are scanned at a periodicrate and an interrupt is generated whenever a key is pressed. Key debouncing and multiple keylockout are also provided in the chip.

The power monitor IC performs three functions. It generates a power-on reset pulse wheneverpower is turned on. As a power monitor, it continuously monitors the +5V power supply andgenerated a reset signal if the supply drops below 4.5V. It also contains a watch dog timerwhich must be periodically reset by the microprocessor. Failure to do so indicates a circuitfailure and causes a reset pulse to be generated.

The analog section monitors the DC voltage fault levels for the power supplies. The front panelalarm LEDs, "PSA" and "PSB" are controlled from the analog circuitry. The "RSU" fault LED islit if either a power supply fault occurs or a switch indicates that it is in the incorrect position.

4.3.2 SWITCHES (A2A1, A5A1)

A. Switch Specifications -

The specifications for the Transfer Switches (A2A1 and A5A1) are the same as thespecifications indicated in Section 1.2.

4-4

4.3.3 POWER SUPPLIES (A1A3, A1A6)

A complete manual for the power supplies is given in Section 7. The following informationapplies:

Power Supply Part Number Voltage Setting"A" (A1A3) 129248 (Alt. P/N

121897)+20.5 ±0.25 V

+5.35 ±0.2 V"B" (A1A6) 129248 (Alt P/N

121897)+20.5 ±0.25 V

+5.35 ±0.2 V

4.3.4 RS232 REMOTE INTERFACE BOARD (A4A3) (Option 17C: RS232 Remote Interface Only)

The RS232 Interface is an add-on PC board which connects to the front panel controller boardvia the J1 connector. Unlike other add-on PC boards, it does not connect to the microcontrollerbus, but simply converts RS422/485 levels from the front panel board into RS232 levels. Thesesignals are brought to the RS232 Interface via the J3 connector where they are converted toTTL levels by the DS3695 interface chips. At this point they are converted to RS232 levels bythe MAX232 chip and then connected to the rear panel Remote Interface connector via J2. The47æf capacitors are used for the charge pump in the MAX232 (negative voltage generator) andfor filtering the 5V supply line.

4.3.5 IEEE-488 REMOTE INTERFACE BOARD (A4A3) (Option 17F: IEEE-488 Remote Interface Only)

The IEEE-488 Interface is an add-on PC board which connects to the front panel controllerboard via the J1 connector. It enables the system to act as a basic Talker/Listener on anIEEE-488 bus (sometimes called the GPIB bus).

The circuit consists of the uPD7210 GPIB chip which acts as an interface between the GPIBbus and the microcontroller on the front panel board. It receives and generates handshakesignals with the bus controller and signals the microcontroller when messages have beenreceived. Timing signals for the uPD7210 are generated from an on board 1.8432 MHz/2.0MHz oscillator. The 75160 and 75161 are transceiver chips which buffer the signals on theGPIB bus and connect to the rear panel GPIB connector via J2. The 74HC00 is required todecode a signal direction signal to the 75161 (transmit or receive).

5-1

SECTION 5

MAINTENANCE

5.1 INTRODUCTION

This section includes information for troubleshooting and instructions for periodic monitoring ofRSU performance in case of malfunction.

5.2 PREVENTIVE MAINTENANCE

The RSU is a completely solid state design. Normal periodic inspection for cleanliness andmechanical integrity should be made in accordance with standard procedures.

To prevent long and costly downtime of the RSU, periodic monitoring of the overall RSUperformance parameters that are most indicative of individual RSU component performance isnecessary. A log should be maintained that provides a permanent record of RSU operation andcompares it to factory provided data. By doing so, any long term degradation, erratic orabnormal performance can be detected early. The overall RSU performance parameters thatare most indicative of individual system component performance and encompass all systemcomponents for correct overall RSU performance are the RSU channel insertion loss, switchingfunctions and power supply performance.

Any excessive change in RSU channel insertion loss indicates a malfunction in the performanceof the switch or a defective interconnect cable. A failure in switch operation may be due to afaulty switch or switch driver failure.

5.2.1 DC VOLTAGE

Connect the digital voltmeter to the DC test point(s) on the power supply. If voltage is beyondtolerance, reset power supply (refer to Appendix and Figure 1-3), using the tuning adjustmenton the power supply.

5.2.2 INSERTION LOSS OF THE RSU

The following procedure is to be followed for insertion loss measurements. Connect the testequipment as shown in Figure 5-1. Set the sweeper to cover the required input frequencyrange. Set the attenuator on the log memory scope to 000 and memorize the input reference.Connect the RSU into the test setup and measure the desired channel. Record the insertionloss of the RSU.

The insertion loss of the RSU should be periodically monitored to reveal deviations which wouldindicate possible malfunction.

5-2

Figure 5-1. Test Setup for Channel Insertion Loss Measurement

5.3 CORRECTIVE MAINTENANCE

If the RSU malfunctions during normal use or if the tests in Section 5.2 reveal excessivediscrepancies in RSU performance, isolation and correction of the malfunction becomesnecessary.

While it is difficult to fully anticipate and describe all possible failure modes in a complicatedelectronic system, this manual contains sufficient information in the form of theory of operationand diagrams to enable an experienced technician to isolate and remove the malfunctioningmodule. In addition, power supply failures can be corrected on the station level.

5.3.1 POWER SUPPLY MALFUNCTION

If the fault is detected in the power supply, remove the power supply protective cover. CheckAC voltage input to the power supply. With the help of the power supply schematics in Section7, isolate the malfunctioning component.

5.3.2 TRANSFER SWITCH MALFUNCTION

If a fault is detected in the switch position, either the switch drive may have failed or the controlboard assembly has failed. With the help of the control board assembly and schematic isolatethe malfunctioning component.

SweeperGenerator

1:1 RSU DetectorOscilloscope

or LogMemoryScope

SteppedAttenuator

TABLE 5-1

PARTS LIST - 1:1 REDUNDANT SWITCHOVER UNIT

ITEM "A" NUMBER MANUFACTURER PART NUMBER DESCRIPTION

5-3

1 A1A1 Corcom 6J4(F1881) AC Line Filter2 A1A2 MITEQ 126215 On/Off Switch3 A1A3 MITEQ 129248 Power Supply

MITEQ 121897 (Alternate P/N) Power Supply4 A1A4 Corcom 6J4(F1881) AC Line Filter5 A1A5 MITEQ 126215 On/Off Switch6 A1A6 MITEQ 129248 Power Supply

MITEQ 121897 (Alternate P/N) Power Supply7 A2A1 128440-9 Transfer Switch - RSU-B, RSU-B/B, RSU-B/S Only

128440-10 Transfer Switch - RSU-S/S Only8 A4A1 MITEQ 119967 Front Panel Assembly9 A4A2 MITEQ 120573 Control Board Assembly

OPTION 17C10 A4A3 MITEQ 121527 RS232 Control Board

OPTION 17FMITEQ 121531 IEEE-488 Control Board

OPTION 17HMITEQ 147921 Ethernet Control Board

11 A4A4 MITEQ 122863 Alarm Input Interface BoardOPTIONS 17A, 17B, 17D

12 A4A5 MITEQ 122863 SPDT Select SwitchOPTION 17H

MITEQ 121084 Alarm Input Interface BoardOPTIONS 17A, 17B, 17C, 17F

13 A4A6 K40-8S Address Select14 A5A1 128440-10 Transfer Switch (RSU-S, RSU-B/S, RSU-S/S Only)

128440-9 Transfer Switch (RSU-B/B Only)

XXXXX represents a unique number assigned at time of order. 128025P

6-1

SECTION 6

DIAGRAMS

6.1 INTRODUCTION

This section contains the schematic diagrams and overall wiring diagrams for the 1:1Redundant Switchover Unit.

TABLE 6-1

LIST OF DIAGRAMS

Fig. No. DESCRIPTION PAGE6-1 Wiring Diagram, 1:1 Redundant Switchover Unit 6-26-2 Schematic Diagram, Control Board Assembly (A4A2) 6-86-3 Assembly Diagram, Control Board Assembly (A4A2) 6-96-4 Schematic Diagram, RS232 Remote Interface

Assembly (A4A3) (RS232 Remote Option Only)6-11

6-5 Assembly Diagram, RS232 Remote InterfaceAssembly (A4A3) (RS232 Remote Option Only)

6-12

6-6 Schematic Diagram, IEEE-488 Remote InterfaceAssembly (A4A3) (IEEE-488 Remote Option Only)

6-14

6-7 Assembly Diagram, IEEE-488 Remote InterfaceAssembly (A4A3) (IEEE-488 Remote Option Only)

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operation and maintenance manual for 1:1 ... - imageevent

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