mpr 6 3 dgf instruction manual

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Table of Contents

Page Subject 2 Introduction 3 Wiring Diagram 4-5 Terminal Review 6-7 Front Panel and LCD Displays 8-9 Menu Configuration 10-17 Parameter Settings 18 Trip/Alarm and Reset Options 19-20 Setting Summary 21 Actual Data 22 Statistical Data 23 Service Options Messages 24 Flash & Constant Massages 25 Communication 26-27 Technical Specification 28 Dimensions

Safety • Read this manual carefully before operating the equipment and follow its instructions • Installation, operation and maintenance should be in strict accordance with this manual, national

codes and good practice. Installation or operation not performed in strict accordance with these instructions will void manufacturer’s warranty.

• Disconnect all power inputs before servicing the MPR-6/3.

Attention 1. This product was designed for compliance with IEC 947-4-2 for class A equipment. 2. The MPR-6/3 is are designed to meet UL requirements 3. For further information, see Technical Specification

Warnings • Internal components and P.C.B’s are at main potential when the MPR-6/3 is connected to main.

This voltage is extremely dangerous and will cause death or severe injury if contacted. • Unit must be grounded to ensure correct operation, safety and to prevent damage.

The company reserves the right to make any improvements

Or modifications to its products without prior notice.

Introduction

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The MPR-6/3 Motor Protection Relay is a new generation of microprocessor based relay designed to protect three phase induction motors. The MPR-6/3 incorporates two main functions. a. Motor protection. b. Supervision and communication. Motor Protection AC motors are very rugged and reliable when operating within their limits. However, they are usually designed to operate close to their rated limits with minimal margins for operating under abnormal conditions. A comprehensive protection device is required to accurately create a Thermal Model for the motor to run safely up to its limits. This relay should protect the motor from abnormal conditions in the power supply, motor and cable faults as well as operator malfunctions. The MPR-6/3 monitors three phase currents (true RMS line currents are measured at a sampling rate of 0.5 mSec). The MPR-6/3 monitors ground fault current (true RMS) and zero sequence voltage (3Vo), for Directional Ground Fault protection. The MPR-6/3 monitors three temperature (RTD or PTC/NTC Thermistor) inputs. In all, the MPR-6/3 provides a comprehensive protection package. Protection - Too many starts - Maximum start time, - Under current - Load increase - Thermal level (Overload) (*) - Over-current Jam / Stall & Short circuit (*) - Unbalanced current (*) - Directional Ground fault current - Phase Sequence - Temperature (3 Sensors)- RTD Pt.100 or PTC/NTC Thermistor (*) - External fault 1- N.O/N.C contacts - External fault 2 - N.O/N.C contacts Two separate levels (*) Each of the these faults has 2 separate levels. Normally level 1 will be used as an Alarm and level 2 as a Trip. It is possible to use both as Alarms or as Trips with different time delays. Field settings Protection levels and time delay settings are individually configured through the key pad on the front panel or through the communication port. Configurable operation Unique Tripping/Alarm options, makes it possible to designate any of the above faults as an Alarm, Trip, both or none. Further more, two auxiliary relays can be designated to operate with any of the faults.

"Time To Trip" and "Time To Start" When current exceeds the overload setting a built-in unique algorithm calculates the time until motor will be tripped (when thermal capacity is 100%), enabling the operator or host computer to take corrective actions before tripping. After the MPR-6/3 has tripped the motor it will calculate the time delay until motor can be restarted, after it has cooled down. Informative data An illuminated LCD (Liquid Crystal Display) with 2 lines and 16 characters each provides clear status and statistical information. Identical information is available through the communication Actual Data - Phase currents, Ground fault current and Thermistor resistance, Motor load in % of FLC, Thermal Capacity, Time to trip, Time to start, Unbalanced current. Statistical Data - Motors running hours, Total number of starts, Total number of trips, Last start time, last start current peak, Last Trip, Last Alarm, Phase currents, Ground fault current, all at time of trip. Communication RS485 serial link with Modbus communication protocol, operating at baud rate of 1200 to 9600 bits/sec enables monitoring of setpoints and actual parameters. Modifications of the setpoint parameters through the serial link make it very easy to enter user setpoints in place of the factory default parameters. The serial link enables remote control of both the MPR-6/3 and the motor. Up to 32 MPR-6/3 relays can be connected on the same link to the host computer. When a need for more than 32 units arises, using MMI & Data highway equipment, an unlimited number of relays can be connected to the host computer. Analogue Output Programmable Analogue Output in reference to: Motor Load Current, Max. of I1-I3, I1, I2, I3, Ground Current, T1, T2, T3, Min. of T1-T3, Max of T1-T3, Thermal Capacity and can be programmed to normal or inverted : 0-20mA, 4-20mA outputs. Easy setting and operation The front panel LCD together with a Keypad and LEDs enables user friendly interface, accurate digital parameters setting, actual parameters reading, and detailed trip and alarm messages display. Unauthorized setting changes can easily be prevented by the software setting

Wiring Diagram & Terminals Review

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Output Relays (C/O, 8A/250VAC, 2000VA) Alarm Relay (Fail-Safe logic) Common .................................................................... 1 N.C ............................................................................ 2 N.O ........................................................................... 3 Fail safe logic - when MPR-6/3 is energized Alarm Relay is energized (changing contacts position). Upon fault which is designated as "Alarm" the relay de-energizes (contacts return to original position). Trip Relay Can be designated (by parameter setting) as one of: * Trip relay (changes contact position upon fault which is designated as "Trip"). * Trip relay with Fail-Safe logic. Common ……………………………………………..4 N.C ............................................................................ 5 N.O ........................................................................... 6 Programmable Relay C Can be designated (by parameter setting) as auxiliary relay - dedicated for a fault or group of faults. Common ……………………………………………..7 N.C ............................................................................ 8 N.O ........................................................................... 9 Programmable Relay D Can be designated (by parameter setting) as auxiliary relay - dedicated for a fault or group of faults. Common ……………………………………………10 N.C .......................................................................... 11 N.O ......................................................................... 12 Discrete inputs Input 1....................................................................... 13 Programmable: Reset, External Fault (N.O or N.C). Input 2 ...................................................................... 14 Programmable: Reset, External Fault (N.O or N.C). Common .................................................................. 15 Note: The Discrete input circuitry is isolated as a group from all other terminals. Discrete Inputs voltage level should be same as Control Power Supply voltage level. Control power supply (115VAC, 230VAC 50/60 Hz, 110VDC, to be specified). Ground ..................................................................... 18 Neutral (-) ................................................................ 19 Phase (+) ................................................................. 20 Analogue Inputs (from 5A C/T, or 1A by special order) Line Currents Phase L1 ........................................................... 21 ,22 Phase L2 ..................................................... 23 ,24 ,25 Phase L3 . .................................................... 26, 27, 28 Terminals 25 and 28 are for convenience when residual wiring is used (not applicable with DGF). Ground Fault Current ........................................ 29, 30


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CT’s and ZCT Wiring Diagrams Note: Standard protection CT’s should be used to measure the line currents. Core Balance ZCT (200mA to 1.5mA) must be used for the Directional Ground Fault. Residually connected line CT’s are not a suitable alternative.

3Vo (Broken Delta VT) WIRING Diagram Three single phase VT’s with Tertiary connection in broken delta to measure the zero sequence voltage. Connect the output voltage to terminals 35 (+) & 36 (-) as shown. The MPR-6/3 is designed for standard 3Vo level of 110V/190VAC.

Resistances * RTD 100Ω-240Ω * Thermistor 0.1KΩ-30KΩ RTD or Thermistor (all must be of same type) selection is done by removing rear panel to set Dip Switches SW1.1 - SW1.8 on Micro-Controller Printed Circuit Board. Set all 8 ON for Thermistors and OFF for RTDs. RTDs three wire measurement system is used to compensate for cable resistance. See temperature table below (max. allowed cable resistance is 25Ω). Note: Consult supplier for on-site / field modifications. Resistance-Temperature-Device Conversion Table (Pt.100=Platinum 100 Ω) TEMP IN Pt.100 OHMS (Ω) (°C) (DIN 43760) --------------------------------------------- 0 100.00 10 103.90 20 107.79 30 111.67 40 115.54 50 119.40 60 123.24 70 127.07 80 130.89 90 134.70 100 138.50 110 142.29 120 146.06 130 149.82 140 153.58 150 157.32 160 161.04 170 164.76 180 168.46 190 172.16 200 175.84 Note : Maximum cable resistance allowed must be ≤25% of RTD resistance. Unconnected temperature sensors: • When the TPR-6 is configured to read RTD sensors,

and RTD’s are not connected at any of the inputs, short the unused inputs of each RTD (41+42+43, 44+45+46 & 47+48+49).

• When the TPR-6 configured to PTC Thermistor, and Thermistors are not used, short each unused Thermistor input (41+42, 44+45 & 47+48).

• When configured to NTC Thermistor, and a Thermistor is not connected, leave open.

See drawing at bottom of page 3.


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RTD / Thermistor Input RTD 100-240Ω ...........................................41-42&43 RTD 100-240Ω ...........................................44-45&46 RTD 100-240Ω ...........................................47-48&49 (Where 43, 46 & 49 are for RTD compensation) Thermistor 0.1K-30KΩ ...................................41-42 Thermistor 0.1K-30KΩ ...................................44-45 Thermistor 0.1K-30KΩ ...................................47-48 Shielded cables must be used, connect shield to ground Note: If RTD/Thermistor is not used, leave open Disconnected Temperature Sensor The MPR-6/3-DGF contains “Disconnected Temp. Sensor” which detects a missing sensor and signals the “Alarm”, but not the “Trip”. Normally, when a sensor’s temperature is very high, a typical relay will trip on high temperature. In the MPR-6/3 when temperature reading becomes infinite rapidly, it will only Alarm and will not Trip. Temp. measurements will show ????. Serial Link Standard RS485 Half Duplex, with MODBUS protocol. Twisted shielded pair should be used for wiring.

Serial Port (-) ............................................................ 39 Serial Port (+) ........................................................... 40 Shield – Connect to Ground Note: 1. In order to match the line, connect 120 Ω

resistor between (+) and (-) at the end and beginning of the line.

Analogue Output Programmable Analogue Output in reference to: Motor Load Current, Max. of I1-I3, I1, I2, I3, Ground Current, T1, T2, T3, Min. of T1-T3, Max of T1-T3, Thermal Capacity and can be programmed to normal or inverted output. Twisted shielded pair should be used for wiring, Connect Shield to Ground. Programming allow selection between: 0-20mA 4-20mA Or their respective inverse. Maximum value (20mA or 0mA) is related to max. scale defined in the “Analogue out Full Range” window. Analogue Port (+) ..................................................... 51 Analogue Port (-) ...................................................... 52 Shield – Connect to Ground (See note) Warning The analogue output circuit is isolated as a group together with the RS485 communication. When using both connections, verify that analogue out user (or RS-485 user) is using isolated circuitry.

Front Panel &LCD Displays

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LEDs and LCD On - Illuminates when control power supply is connected. Start/ Run - Flashes during starting, illuminates continuously after completion of starting Alarm /Trip - Flashes in Alarm condition, illuminates continuously at Trip condition . Turns off after resetting. LCD Display – Illuminated two lines of 16 characters each, presenting all data and messages. Operation Upon initiation the On LED lights and the LCD displays:

Communication ***Settings***

In order to review above page press Select key. Messages are displayed on the LCD in two lines. • Upper line describes

parameter's name. • Lower line shows its value.

To change settings, press

or keys and save the new value by pressing Store key. Once data was properly stored in the non-volatile memory the LCD displays the 2 sec. flash message:

DATA SAVED OK

Notes : 1. A new parameter setting

becomes effective when set, even before storing it in the non-volatile memory. Setting a parameter without storing, and moving to another page, will return the parameter to its previously stored value.

2. Any set-point parameters can be viewed, altered and stored at any time (provided that Parameters Lock set to No). However, it is not recommended to change and store parameters while motor is starting or running.

3. Any stored parameter is kept indefinitely in the non-volatile memory.

Keys Page - Press to change set-point pages in positive cyclical order. Select - Press to scroll parameters within page. If key is pressed for more than 0.5 sec, parameters will be displayed at a fast rate.

- Press to increase / decrease parameter value. Press and hold to fast rate changing (*). Store - Press to store displayed parameter value in the non-volatile memory (*). Reset - Press for more then 0.5 Sec. to cancel displayed Alarm or Trip (*). Short press on the RESET key will toggle the direction of massage display. At up direction a " __ " character is displayed at the bottom left hand side of the LCD. Pressing on Page key or leaving the keypad with no action for 10 Sec returns scroll direction to forward (down) direction. Notes: If "Parameters Lock" is set to Yes, parameters can be only viewed. When Parameters lock is set to No, it is possible to view, change and store any setting parameter.

Front Panel & LCD Displays

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Five types of information displays are available. 1. Parameter Settings By pressing Page key the LCD displays the following headers:

SYSTEM PARAMETER ***SETTINGS***

PROTECTION

***SETTINGS***

TRIPPING / ALARM ***OPTIONS***

2. Informative Data By continuing pressing Page the LCD displays the following headers:

ACTUAL DATA

3. Service Messages

By pressing Page and keys the LCD displays the following header:

SERVICE *** OPTIONS ***

4. Flash Messages Flash messages are displayed as a response to an event. For example, the flash message after storing is:

DATA SAVED OK

5. Constant Messages Messages which are displayed upon fault. For example, when starting process is too long and MAX START TIME is enabled as Trip the following constant message will appear.

TRIP: MAX START TIME

Alarm message for a missing Temperature sensor.

Notes : 1. Pressing Store key while the LCD displays an

"Actual Data" parameter, will store this parameter as default display. If no key is pressed for more than five minutes, this parameter will be constantly displayed.

2. Pressing Store key while the LCD displays a

header, will store this header as the default display. If no key is pressed for more than five minutes this header will be constantly displayed

Returning to Factory Default Values Press Page and simultaneously, the LCD will display:

SERVICE ***OPTIONS***

Press Select key twice, the LCD will display:

STORE NOW ? DEFAULT SETTINGS

Press Store and Page keys simultaneously, the LCD will display:

DATA SAVED OK

Attention : Storing Default parameters erases all previously updated parameters. Clearing Statistical Data Values Press Page and simultaneously, the LCD will display:

SERVICE ***OPTIONS***

Press Select key three times, the LCD will display:

CLEAR STATISTICAL DATA

Press Store and Reset keys simultaneously, the LCD will display:

DATA SAVED OK

Attention : Clearing statistical data erases all previously stored statistical data.

Menu Configuration

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UPON INITIATION, the LCD Displays: I1= , I2 = , I3 =

PAGE 1 PAGE 2 PAGE 3 PAGE 4 PAGE 5

SYSTEM PARAMETER

*** SETTINGS *** PROTECTION

*** SETTINGS *** TRIPPING ALARM

*** OPTIONS *** ACTUAL DATA

-****- STATISTICAL DATA

-****-

SELECT SELECT SELECT SELECT SELECT

TO REVIEW/MODIFY ALL PARAMETERS PRESS KEYS TO CHANGE PARAMETER VALUE

LINE FREQUENCY 50HZ

MAX START TIME 10 SEC.

MAX START TIME TRIP: DISABLE

I1 I2 I3 0 0 0 A

LAST START PERIOD 5.5 SEC

MOTOR FLC 100 AMP.

NUMBER OF STARTS 10

MAX START TIME ALARM: ENABLE

I0 3V0 0 0 mA,V

LAST START MAX I 350A

CT PRIMARY 100 AMP.

STARTS PERIOD 30 MIN.

MAX START TIME AUTO RST: DSABL

T1 T2 T3 95 96 94 C

LAST TRIP THERMAL LEVEL 2

ZCT RATIO 133.3

#ST AUTO RST DLY 15 MIN.

MAX START TIME RELAY C: DISABLE

MOTOR LOAD CURR. 0% OF FLC

LAST ALARM THERMAL LEVEL 1

TRIP INHIBIT OFF

UNDER CURR. LEVEL 40% OF FLC

MAX START TIME RELAY D: DISABLE

UNBALANCE CURR. 0%

TRIP I1,I2, I3 90 90 90 A

CONFIG. TRIP REL TRIP

UNDER CURR. DELAY 5 SEC.

TOO MANY STARTS TRIP: DISABLE

THERMAL CAPACITY 20% OF CAPACITY

TRIP I0,3V0 0 0.0 mA,V

CONFIG INPUT 1 REMOTE RESET

LOAD INCREASE 120% OF FLC

UNDER CURRENT TRIP: DISABLE

TIME TO TRIP-O/L NO TRIP EXPECTED

TRIP T1, T2, T3 0 0 0 C

CONFIG INPUT 2 REMOTE RESET

O/C LEVEL 1 – JAM 400% OF FLC

LOAD INCREASED TRIP: DISABLE

TIME TO START 0 SEC

TOTAL RUN TIME 10137.5 HOURS

CONFIG. ANLG OUT 4..20mA NORMAL

O/C LVL 1 DELAY 2.0 SEC.

O/C LEVEL 1 - JAM TRIP: ENABLE

TOTAL # OF STARTS 1017

AN.OUT PARAMETER MOTOR LOAD CURR.

O/C LVL 2 – SHORT 800% OF FLC

O/C LVL 2 - SHORT TRIP: ENABLE

TOTAL # OF TRIPS 12

AN.OUT FUL RANGE 200% OF FLC

O/C LEVEL 2 DELAY 0 5 SEC

THERMAL LEVEL 1 TRIP: DISABLE

PARAMETERS LOCK NO

OVERLOAD PICKUP 105% OF FLC

THERMAL LEVEL 2 TRIP: ENABLE

MOTOR NUMBER 0

THERMAL LEVEL 1 80% OF CAPACITY

UNBALANCE LVL 1 TRIP: DISABLE

ADDRESS NUMBER 248

T6X TIME 10 0 SEC

UNBALANCE LVL 2 TRIP: DISABLE

BAUD RATE 19200

HOT/COLD RATIO 50%

PHASE S EQUENCE TRIP: DISABLE

COOL TIME FACTOR 5

GROUND FAULT TRIP: DISABLE

UNBALANCE LVL 2 15% OF FLC

COMM PORT FAILED TRIP: DISABLE

U/B LVL 2 MAX T 30 SEC

INTERNAL FAILURE TRIP: DISABLE

GND FLT CURRENT 0.2A

EXTERNAL FAULT 1 TRIP: DISABLE

GND FLT VOLTAGE 15V

EXTERNAL FAULT 2 TRIP: DISABLE

GND FAULT PHASE 60°

TEMP. LEVEL 1 TRIP: DISABLE

GND FAULT DELAY 0.2 SEC

TEMP.2 LEVEL 2 TRIP: DISABLE

CH 1 2 3 SENSOR RTD

THERMISTOR TYPE PTC

TEMP. LEVEL 1 100 ° C

TEMP. LEVEL 2 130 ° C

Menu Configuration

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Program Version SMP260596-Modbus

Store Now ? Default Settings

Clear Statistical Data

Service *** Options ***

Select

Page 1

Press Select + Key to enter Service Options mode

Key to select the required parameters

Press Page + Store Key to Store Default Settings

Press Reset + Store Key to Clear statistical Data

Parameter Settings

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SYSTEM PARAMETERS ***SETTINGS***

Parameter & Default Value Description Range Increments

LINE FREQUENCY 50 HZ

Rated frequency 50 / 60 Hz

MOTOR FLC 100 Amp.

Motor Full Load (name plate) Current. 1 - 1000A 1A

CT PRIMARY 100 Amp. Primary rated current of Current Transformer. 1 - 1500A. 1A

ZCT RATIO 133.3

Type of Zero sequence (Ground Fault) Current Transformer.

10.0- 2000.0 0.1

TRIP INHIBIT OFF

Inhibits Trip command thus preventing opening of motor contactor when current exceeds a set value, to prevent contactor's damage. The fault must be cleared by an upstream circuit breaker or fuses. When contactors are not used (circuit breaker application) set to OFF. Note: Thermal Level 2 Trip overrides trip inhibit setting.

400-1000% of Motor FLC, OFF

10%

WARNING The MPR-6/3 will not protect the motor against high current above the current inhibit setting. It is the customer's responsibility to ensure that the motor is protected against fault current, above Current Inhibit by external protection.

CONFIG. TRIP REL Designation of Output Relay B as: • Trip • Trip fail-safe

CONFIG. INPUT 1 Remote Reset Designation of Input -1 as:

• Remote Reset • Ext. fault 1 N/O • Ext. fault 1 N/C

CONFIG. INPUT 2 Remote Reset Designation of Input -2 as:

• Remote Reset • Ext. fault 2 N/O • Ext. fault 2 N/C

CONFIG. ANLG OUT 0..20mA NORMAL

Choose Desired Output range (mA) • 0-20mA, 0-20mA Invert • 4-20mA, 0-20mA Invert

AN.OUT PARAMETER

Parameter for the analogue output ref.

Motor Load Curr., Max. of I1-I3, I1, I2, I3, Ground Curr., T1, T2, T3, Min. of T1-T3, Max. of T1-T3, Thermal Capacity

AN.OUT FUL RANGE Define the highest output of the ref. device From 0-250% (in °C or mA), or % of Thermal Capacity (Respectively)

PARAMETERS LOCK No

Set to Yes to prevent setting parameters changes, resetting Thermal Capacity and storing.

No / Yes

MOTOR NUMBER 0

For customer convenience only, This parameter has no effect on MPR-6/3 operation. 0 - 999 1

ADDRESS NUMBER 248

MPR-6/3 Address on Serial Link. RS485 Allows a maximum of 32 MPR-6/3's on a twisted pair. For user convenience, the number of serial links is extended to 3 digits.

1-247, 248 = Off 1

Baud Rate 19200

Serial Link communication speed in bps. Disconnect and then reconnect control supply after any change of baud rate.

1200, 2400, 4800, 9600, 19200

Parameter Settings

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PROTECTION ***SETTINGS***


MAX. START TIME 10 sec.

Maximum permitted starting time. End of starting is assumed when motor's current decreases below 110% of Overload Pickup value.

1 - 250 sec. 1 sec.

NUMBER OF STARTS 10 At fault LCD displays: TOO MANY STARTS

Maximum Permitted number of starts during "Starts Period". Auto Reset, when Enabled, occurs after "#St Auto Rst Dly" time has elapsed.

1 - 10 1

STARTS PERIOD 30 min.

Time period during which the number of starts is counted. 1 - 60 min. 1 min.

#ST AUTO RST DLY 15 min

Auto reset (when enabled) delay after Too many starts faults. 1 - 60 min. 1 min.

UNDER CURR. LEVEL 40% of FLC

Under Current level for a running motor. Fault occurs when current decreases below the set value for more than Under Curr. Delay.

10 - 90 % of Motor FLC. 1%

UNDER CURR. DELAY 5 sec.

Under Current delay. 1 - 60 sec. 1 sec.

LOAD INCREASE 120% of FLC

Load Increase Alarm. Operative after start process ended (after current decreased below 110% of Overload pickup). Fault occurs when motors average current increases above the set value for more than 5 sec.

60 - 150% of Motor FLC 1%

O/C LEVEL 1 - JAM 400% of FLC

Over Current Level-1. Stall / Jam protection, operative after end of starting process. Fault occurs when motors average current increases above set value for more than O/C Lvl 1 Delay.

100 - 500 % of Motor FLC. 10%

O/C LVL 1 DELAY 2.0 sec.

Time delay for over current level-1. 0.5 - 10 sec. 0.1 sec.

O/C LVL 2- SHORT 800% of FLC

Over Current Level-2. Short circuit protection, operative during starting and running. Indicates that current exceeded set value for more than O/C Delay. Note: O/C Level 2" Trip is prevented when the highest of any of the line currents exceeds Trip Inhibit setting. It is designed to prevent opening of motor contactor under high short circuit conditions to protect it's contacts from being damaged.

400 - 1200 % of Motor FLC. 10%

O/C LVL 2 DELAY 0.5sec.

Time delay for over current level -2. Note: When set to 0 actual delay is less than 90 mSec.

0 – 4 sec. 0.1 sec.

OVERLOAD PICKUP 105% of FLC

Lower threshold for Thermal Level 1 / 2 protection. Thermal trip is not possible as long as current is below the set value. When current increases above the set value a trip will occur after a time delay that depends on the present value of the current level, the “Thermal Capacity” and on the t6x setting

60 – 130 % of Motor FLC. 1%

Parameter Settings

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THERMAL LEVEL 1 80% of Capacity

Simulation of motor’s thermal condition, stored in a thermal register. The “heating” of the thermal register (i.e. it’s increment) is related to the square of the current (the highest of the three line currents). The rate of “cooling” of the thermal register is directly related to motor’s present Thermal condition. Thermal capacity of 100% is equivalent to a motor running at the maximum allowed temperature. At this point the motor must be tripped (Thermal level 2). “Thermal Level 1” is adjustable from 50-99% of “Thermal Trip”. The following three parameters are used to calculate the “Thermal Capacity”.

50 – 99 % of max. thermal capacity.

1%

t6X TIME 10.0 sec

Overload trip time of cold motor at 6 times Motor FLC. (The time required to heat Thermal Capacity from 0 to 100% at 6 x FLC).

0.5 – 120 sec. 0.5

HOT/COLD RATIO 50%

The ratio between thermal Capacity available for a hot motor and thermal capacity available for a cold motor. (A higher setting allows for a longer time before tripping hot motor due to high current).

20- 100% of Thermal Capacity.

1%.

COOL TIME FACTOR 5

The Ratio between cooling time constant of stopped motor to the heating/cooling time constant of running motor.

1 – 15 1

UNBALANCE LVL 2 15% of FLC

Unbalance Current –The difference between maximum and minimum values of motors’ three line currents, divided by motors’ maximum current or motors’ FLC (this method prevents nuisance alarms at low currents). Fault occurs only if actual Unbalance is greater than the set value. See figure 6 for time delay. This parameter has no influence on unbalance level 2 time delay. Notes:

1. Unbalance Level 1 is automatically set to 50 % of Unbalance Level 2 setting. It uses fixed time delay of 5 sec.

2. To prevent nuisance tripping, Unbalance Level 2 is in effect, only after Unbalance Level 1 fault is active

10 – 40% see curve on page 15

U/B. LVL 2 MAX T 30 sec.

Unbalance curve selection. Time delay at 10 % of Unbalance. Fault time inversely relates to the actual unbalance (See page 15).

20 – 120 sec. 1 sec.

Parameter Settings

14


GND FLT CURRENT 0.2A

Zero sequence Ground fault operating current. Fault may occur only if ZCT Ground Current exceeds GND FLT CURRENT set value.

100mA – 10A 10mA

GND FLT VOLTAGE 15V

Zero phase (3Vo) operating voltage. Rated Input Voltage is 110V/190VAC. Fault may occur only if zero phase voltage exceeds GND FLT VOLTAGE set value. The voltage level is ignored if GND FLT VOLTAGE is set to Off. Setting this parameter to OFF, cancels the Directional current detection feature . The MPR-6/3 operates with normal non-directional, sensitive, ground fault protection.

5 - 30 V, Off 1V

GND FLT PHASE 60°

Expected phase between: (-)3Vo (3Vo output, with swapped wires) to zero sequence current of the faulty line. Phase is considered positive if the ZCT current Leads the (-)3Vo voltage. Fault may occur only if ZCT Ground Current is in the range of GND FLT PHASE ±90°. The zero sequence voltage to current phase angle is ignored if GND FLT PHASE is set to Off Setting this parameter to OFF, cancels the Directional current detection feature . The MPR-6/3 operates with normal non-directional, sensitive, ground fault protection.

0 – 90°,Off 10°

GND FLT DELAY 0.2 Sec.

Ground fault Delay. Fault occurs only if zero sequence current and voltage exceed their settings, and gnd fault phase match the operating range for more than GND FLT DELAY.

0.1 – 20 sec. 0.1 sec.

CH. 1 2 3 SENSOR RTD

Select desired temperature sensors (selection must be accompanied by internal dip switch settings)

RTD / Thermistor

THERMISTOR TYPE PTC

Determines type of Thermistor (when used) . PTC - Positive Temperature Coefficient NTC - Negative Temperature Coefficient

NTC/ PTC

TEMP. LEVEL 1 100°C

Choose the desired temperature set point for Alarm

• 0-250°C • 0.1-30KOhm

1°C 0.1KOhm

TEMP. LEVEL 2 130°C

Choose the desired temperature set point for Trip

• 0-250°C • 0.1-30KOhm

1°C 0.1KOhm

Parameter Settings

15

Figure 4 - Overload Protection - Cold Motor Figure 5 - Overload Protection - Hot Motor (hot/cold ratio = 0.5)

I/In1098765432

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2

3

45

6

10

100

1000

10000T

ime

(Sec

)

t6x=120

t6x=60

t6x=30

t6x=20

t6x=10

t6x=5

I/In

1098765432

1

1

2

3

4

56

10

100

1000

10000

Tim

e (S

ec)

t6x=120

t6x=60

t6x=30

t6x=20

t6x=10t6x=5

100

Parameter Settings

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Actual Unbalance (%)

1009080706050403020101

2

3

45

10

120

1000

Para

met

er: U

/B L

VL

2 M

ax T

ime

(Sec

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80

60

40

20

Figure 6 - Unbalance Protection

Unbalance Level Value Selection: Diagonal selected line intersects with the vertical axis at U/B LEVEL MAX T, as set at Protection Settings page. Unbalance greater then Unbalance LEVEL will Alarm / Trip after time delay that depends on the severity of the unbalance and the selected curve. Example: Assume that the user requires the MPR-6/3 to trip the motor at 40% Unbalance current after a delay of 5 sec. The intersection point of 5 sec and 40 % is on a diagonal line which intersects the X axis at 80 sec. Hence, set U/B LEVEL MAX T parameter to 80 sec. Please note that at 60 % unbalance the MPR-6/3 will trip after approximately 2.5 sec. Unbalance LVL 2 parameter will set the lower threshold under which the MPR-6/3 will not trip. Note: To prevent nuisance tripping, Unbalance Level 2 is in effect only after Unbalance Level 1 fault is active.

Parameter Settings

17

Directional Ground Fault Protection Isolated systems The Directional Ground Fault protection of the MPR-6/3, is mainly designed for isolated (ungrounded) system. In such systems, there is no direct connection between the mains lines and the ground. Cable capacitances and ZCT (Zero sequence CT’s) resistive loading, effectively ties the mains to ground. Upon a fault of a phase to ground, relatively small capacitive-resistive current flows. The direction (phase) of ZCT current in the faulty line, is opposite (by 180°) to other ZCT currents in the healthy lines. To detect the phase of the ZCT current, a voltage reference is required. This voltage can be obtained using a Broken Delta winding connection of voltage transformers. This output voltage is normally marked (3Vo). The MPR-6/3 uses (-)3Vo as it’s reference voltage. (-) sign is obtained by swapping the two output wires of the broken delta, while connected to the MPR-6/3 relay. For a solid L1 to ground fault of an ideal symmetrical system: • The three line-to-line voltages remain unchanged. • (-) 3Vo voltage, is in phase with VL1-N (same phase angle as L1 line to neutral voltage). • ZCT current of the faulty line equals to the sum of the capacitive-resistive currents of all healthy lines. The capacitive current component in a faulty line (as measured by the ZCT), Leads the reference (-)3Vo voltage, by 90°. The ZCT is normally resistively loaded. It’s current is in phase with (-)3Vo. The total phase angle of the ZCT current in the faulty line Leads the (-3Vo) reference voltage by 0° to 90°, according to the value of equivalent capacitive and resistive currents. The MPR-6/3 allows for a setting range of the expected ZCT current (lead) phase from 0° to 90°. In a typical system, the capacitive current is significantly larger than the resistive current, therefore the default phase is set to 80°. The Directional Ground Fault protection operates only if the following 4 conditions are fulfilled:

• (-)3Vo value is larger than set value (GND FLT VOLTAGE). • ZCT current is larger than set value (GND FLT CURRENT). • ZCT current Leads (-)3Vo output voltage by the set phase angle ±90° (GND FAULT PHASE). • The above condition is maintained for more than the set time (GND FAULT DELAY).

The MPR-6/3 uses high quality filtering of the zero sequence voltage and current, using both 8th order filters and software filtering to suppress high frequency harmonics and d.c component induced by faults or system operations Phase angle Characteristics Compensated Systems In a compensated mains, the system Neutral is connected to earth via a reactance (known as Peterson coil), used to balance the system capacitance. In such case the overall reactive current can be capacitive or inductive. For a directional ground fault of a compensated system, set the GND FLT PHASE to 0°.

Parameter Settings

18

Additional Protection

Parameter & Default Value Description Range

PHASE SEQUENCE No

Fault occurs when the phase sequence is reversed. Phase sequence is tested only for short period after starting. Detection of wrong phase sequence accomplished in less then 0.5 Sec. Note: The phase sequence is designed to operate properly only in DOL starting. If for example motor is started by electronic soft starter, VFD, etc. Phase Sequence protection must be set to Off.

Yes / No

EXTERNAL FAULT 1 If config. input 1 is set to Ext. Fault 1 N/O then Fault occurs when In.1 and common input terminal contact closes. If config. input 1 is set to Ext. Fault 1 N/C then Fault occurs when Programmable Input-1 contact opens.

EXTERNAL FAULT 2 If config. input 2 is set to Ext. Fault 2 N/O then Fault occurs when Programmable Input-1 contact closes. If config. input 2 is set to Ext. Fault 2 N/C then Fault occurs when Programmable Input-1 contact opens.

INTERNAL FAILURE The MPR-6/3 incorporates a built in Test program. The test program is constantly running in the background. Fault occurs when the MPR-6/3 detects an internal fault.

Communication Port Failed At fault LCD displays COMM FAILURE

Fault occurs when the MPR-6/3 detects three consecutive transmissions from the host computer, in which a parity bit, and/or the CRC word are wrong. Auto reset, when Enabled, occurs when a transmission from the host computer is received properly.

Trip / Alarm Options

19

Protection function Each of the MPR -6 Protection has five setting: 1. Trip 2. Alarm 3. Auto Reset 4. Relay C 5. Relay D

With this five setting any the MPR-6/3 protection can be assigned to each of the following functions : 1. Trip only 2. Alarm only 3. Alarm and Trip 4. Disabled 5. Enabling Auto Resetting 6. Operating Aux relay C 7. Operating Aux relay D

When Trip only is required 1. Set Trip: Enable, Alarm: Disable. Upon fault:

• Trip LED illuminates. • Trip relay: if designated as "Trip", energizes. if

designated as "Trip-Fail Safe", de-energizes. • Relays C and/or D (if assigned to function in this

fault) energize. 2. When Alarm only is required set Trip: Disable,

Alarm: Enable. Upon fault: • Alarm LED illuminates. • Alarm relay: De-energizes (fail-safe operation) • Aux relay C and/or D (if assigned to function in

this fault), energize. 3. When Alarm and Trip are required set Trip:

Enable, Alarm: Enable. Upon fault: • Trip and Alarm LEDs illuminate. • Trip relay: if designated "Trip", energizes. if

designated to "Trip-Fail Safe", de-energizes. • Alarm relay: De-energizes (fail-safe operation) • Aux relays C and/or D (if assigned to function in

this fault) , energize. 4. To Disable this protection set Trip: Disable, Alarm:

Disable 5. Operating Aux relay C

The relay can be assigned for one or more of the 20 faults. It will operates for a certain fault only if Trip or Alarm are enabled.

6. Operating Aux relay D The relay can be assigned for one or more of the 20 faults. It will operates for a certain fault only if Trip or Alarm are enabled.

External Faults External Fault 1 occurs when input 1 is set as “External Fault 1 NO” and the MPR detects control voltage between In.1 and common input terminals. External fault 1 occurs when Input 1 is set as “External Fault 1 NC” and the MPR detects no voltage between the “In1” and the “Common” input terminals. More than One Alarm or Trip. The MPR-6/3 is designed to accept and store the first Alarm it detects. If this alarm has not been reset and an additional alarm occurs, the MPR-6/3 will not display the second alarm on the LCD nor assign it to the Fault Data page. Example: If "Unbalance Level 1" occurs and then a "Thermal Level 1" occurs, the MPR-6/3 will continue displaying "Unbalance Alarm" message on both LCD and Statistical Data page. This is to assist the user in establishing the cause of the alarm. In case a trip occurs after an alarm, the trip message will override the alarm message. Resetting Reset after fault can be either through the Reset key on the front panel or remotely through Input -1 or 2, when designated as Remote Reset, or through the Serial link. The MPR-6/3 can also be assigned to have Auto Reset Auto Reset - When required set "Auto Rst: Enable" If not required set "Auto Rst: Disable" The MPR-6/3 resets itself automatically when the fault cause disappears. The Auto Reset is activated after a 2 sec. delay. Note: It is recommended to avoid unnecessary Autoreset On some faults, when Auto Reset is enabled, the MPR-6/3 trips and after a 2 sec. delay resets itself automatically. The fault message on the LCD disappears after 2 sec. Example: On "U/C Level 2", when Auto Reset function is Enabled, the contactor opens. After 2 sec. automatic Reset occurs. The motor stops and the "U/C Level 2" message is displayed for only 2 sec. Thermal Capacity Reset method (to enable emergency restart) Due to the importance of the Thermal protection a different reset method is used. Thermal Capacity fault can be reset only from the front panel Reset key. It is not possible to reset this fault through Input-1 or Input-2 and not through the communication. It is impossible to reset a "Thermal Level 2" condition until "Thermal Capacity " has reduced bellow 50%. If urgent starting is needed (while parameters lock=N0), before thermal capacity has reduced below 50%, press Reset key. The LCD will display: "Reset Thermal Capacity??? Pressing Reset key again after 1 second resets the Thermal Capacity.

Setting Summary

20

The following table summarizes the ranges and factory default settings for each of the parameters. New settings can be marked in the empty spaces ( ). In this table, (+) stands for "Enabled", (-) for "Disabled" and - to not applicable. Motor Number (___________) Application Name (____________________________________________)

Function No. Function Name Range Default

Settings Field Settings

1 Line frequency 50-60Hz 50HZ 2 Motor FLC 1-1000A 100A 3 C/T Primary 1-1500A 100A 4 ZCT Ratio 10.0 – 2000.0 133.3 (200/1.5) 5 Trip Inhibit 400-1000% FLC, Off Off 6 Config. Trip Relay Trip/Trip - Fail-safe Trip 7 Config. Input 1 Reset, Ext Fault N.O or N.C Reset 8 Config. Input 2 Reset, Ext Fault N.O or N.C Reset 9 Config. Anlg Out 0..20mA,4..20mA Normal/Inverted 4..20mA Normal 10 An.Out Parameter List of 12 parameters Motor Load Curr. 11 An. Out Ful Range 10 – 250% of FLC 200% of FLC 12 Parameters lock Yes / No No 13 Address No 1-247, 248=Off 248

Syst

em P

aram

eter

s Set

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14 Baud Rate 1200-9600 9600 15 Max Start Time 1-250 sec 10 sec 16 No of Starts 1-10 10 17 Starts period 1-60 min 30 min 18 #St Auto Rst Dly 1-60 min 15 min 19 Under Curr. Level 10-90% FLC 40 % 20 Under Curr. Delay 1-60 sec 5 sec 21 Load Increase 60-150% FLC 120 % 22 O/C Level 1- (Jam) 100-500% FLC 400 % 23 O/C Level 1 delay 0.5-10 sec 2 sec 24 O/C Level 2 - Short 400-1200% FLC 800% 25 O/C Level 2 delay 0-4 sec 0.5 sec 26 Overload pickup 60-130% FLC 105 % 27 Thermal Level 1 50-99% FLC 80 % 26 t6x (curve selection) 0.5-120 sec 10 sec 27 Hot to Cold Ratio 20-100% 50 % 28 Cool Time Factor 1-15 5 29 Unbalance Level 2 10-40% of FLC 15% 30 U/B Lvl 2 Max T 20-120 Sec 30 sec 31 Gnd Flt Current 0.1 – 10A 0.2A 32 Gnd Flt Voltage 5 – 40V, Off 10 V 33 Gnd Flt Phase 0-90° Lead from (-)3Vo to Ig, Off 60° 34 Gnd Flt Delay 0.1 – 20 Sec. 0.2 Sec. 35 CH 123 Sensor RTD / Thermistor RTD 36 Thermistor type NTC / PTC PTC 37 Temp. Level 1 0.1-30K / 1-250°C 3K / 100°C

Prot

ectio

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s

38 Temp. Level 2 0.1-30K / 1-250°C 4K / 130°C

Setting Summary

21

Trip/ Alarm Options:

Trip Alarm Auto Reset Relay C Relay D Protection

Description Dflt New Dflt New Dflt New Dflt New Dflt New ANSI Code Standards

1 Max Start Time - + - - - 48 2 Too Many Starts - - - - - 66 3 Under Current - - - - - 37 4 Load Increased - + - - - 51L 5 O/C Level 1-Jam + + - - - 51R 6 O/C Lvl 2 - Short + + - - - 50 7 Thermal Level 1 - + - - - 49S/51 8 Thermal Level 2 + + - - - 49S/51 9 Unbalance Lvl 1 - + - - - 46 10 Unbalance Lvl 2 + + - - - 46 11 Phase Sequence - - - - - 47

12 Directional GND Fault + + - - - 67

13 Comm Port Fail - - + - - 3 14 Internal Failure - + - - - --- 15 External Fault 1 - - - - - --- 16 External Fault 2 - - - - - --- 17 Temp. Level 1 - - - - - 49R 18 Temp. Level 2 - - - - - 49R

Note: Disable - Enable +

Actual Data

22

To enter Actual Data press Page key until Actual data header is displayed Note: Values given below are examples only.

ACTUAL DATA - -

Parameter & Example Value Description Range

I1 I2 I3 345 343 346 A

Line (motor) currents. 1A - 12KA.

I0 3V0 0 0 mA/V

Ground fault zero sequence voltage and current. 0 – 30V, 0–1000mA with 200/1.5mA ZCT

T1 T2 T3 95 96 94 C

RTD Measured °C / Thermistor measured resistance. Note: if Thermistor/RTD is not connected display shows: ?????

RTD 1-250°C Thermistor 0.1- 30K

MOTOR LOAD CURR. 90 % of FLC

Motor current as a percentage of Motor FLC. 0 - 1200% FLC

UNBALANCE CURR. 1%

Unbalance current, the difference between max. and min. of motor's three line currents, related to the larger between motor's max. line current and Motor FLC.

0 - 100%

THERMAL CAPACITY 20% of Capacity

Thermal register capacity. Trip level = 100% 0-250% of max. Thermal Capacity

TIME TO TRIP- O/L No Trip Expected

Expected time to trip (reaching 100% Thermal Capacity) at the present current value.

No trip expected, 0 - 4 hours

TIME TO START 0 sec.

Expected time to re-start is displayed on the LCD in one of the following cases: * After "Thermal Trip" - in this case it is the expected time of

the Thermal Capacity to decay to 50% of its the maximum "Thermal Capacity".

* After "Too Many Starts" Trip - it is the time until Auto Reset will be performed (if enabled)

After "Thermal Trip": 0 - ... minutes After "Too Many Starts" : 1 - few hours.

Statistical Data

23

STATISTICAL DATA - -

Parameter & Example Value Description Range

LAST STRT PERIOD 5 sec.

Last start time duration. 0-255 seconds.

LAST START MAX I 350 amp.

RMS maximum current (highest of three phases) during last start. 0-24000 amp.

LAST TRIP Temp. Level 1

Last active fault that was Enabled as a Trip. all 20 faults

LAST ALARM Temp. Level 2

Last active fault that was Enabled as an Alarm. all 20 faults.

Trip I1, I2, I3 110 112 109 A

Values of three line (motor) currents before last trip. 0-12000 amp.

TRIP I0,3V0 0 0 mA,V

Values of Ground Fault zero sequence voltage and current before last trip. 0 – 30V, 0-1000mA

TRIP T1,T2,T3

0 0 0 C

Values of thermal sensors before last trip. R1-R3 for Thermistors and T1-T3 for RTD’s

RTD 1-250°C Thermistor 0.1- 30K

TOTAL RUN TIME 10137.5 hours

Total run time since commissioning. 0-60,000 hours.

TOTAL # OF START 1017

Total number of starts since commissioning. 0-65535

TOTAL # OF TRIPS 12

Total number of trips since commissioning. 0-65535

Test Messages

24

SERVICE OPTIONS

Parameter & Example Value Description

PROGRAM VERSION MP3140702-Modbus

Program version description.

STORE NOW ? Default settings

Stores All factory default parameters in the non-volatile memory. Press Store and Set Page keys simultaneously, to store. "Data Saved Ok" message will be displayed for about two seconds. Resets and stores "0" for all the statistical data. Press Reset and Store keys simultaneously, to reset and store zero values in the non-volatile memory. The parameters are: Total run time , Total # of starts, Total # of trips, Last start period, Last start peak I, Trip I1, I2, I3, Trip GND current, Trip T1,T2,T3, Thermal capacity " Data Saved OK" message will be displayed for about two seconds.

CLEAR Statistical Data

Warning Resetting Statistical Data resets all previous statistical data values ! ! ! The last two actions (default storing and resetting statistical data ) should be done with care, since retrieving previous set-point parameters or statistical data is impossible.

Flash & Constant Messages

25

Flash Messages The message is displayed for a short while only. Display than returns to the previous message. Flash messages are usually displayed as a response to an operator action. It is used either to confirm activation of the requested operation, or to indicate reason for not doing so.


DATA SAVED OK

Displayed after pressing Store key. If an error is found during store process, then next message is shown.

STORAGE ERROR

Displayed when an error is found in the store process.

WRONG PARAMETERS

Displayed after power-up, if the non-volatile parameter check sum is found to be wrong.

UNAUTHORIZED ACCESS

Displayed when Parameters lock is set to yes, and a parameter change is attempted. Also displayed after Unauthorized Store action.

RESET THERMAL CAPACITY ???

Displayed as a response to pressing Reset key while parameters lock is set to No. It indicates that a second press on Reset key after 1 Sec. will reset thermal capacity to 0. Note : This should be done with care !! Resetting Thermal Capacity may prevent the MPC from tripping for thermal overload while justified

THERMAL CAPACITY RESET PERFORMED

Displayed after second press on Reset Key, as explained in the previous message.

Constant Messages Displayed, as a response to an event and not as a result of an operator action.


ALARM THERMAL LEVEL 1

Displayed when the Alarm LED illuminates. The lower line displays the fault name.

TRIP THERMAL LEVEL

Displayed when the Trip LED illuminates. The lower line displays the fault name.

Communications Communications Manual is supplied upon request

26

The MPR-6/3 incorporates RS485 serial link and uses a Modbus RTU protocol (The protocol is not included in this document) to provides high-speed data acquisition to supervisory computers. Data formats have been carefully structured to provide fast notification of alarms and continuous updates of performance parameters. Load control can be performed from host computers or by PLCs. The following can be performed through the communication. * Read and modify all MPR-6/3 Settings • Read all Actual and Statistical Data parameters • Reset

System security is exceptionally high, meeting the highest standards of protected communication in the industry. Included in each message is a 16 bit CRC. RS-232 to RS-485 Converter

For programming and supervision of single units via IBM-PC or compatible.

Small System Up to 32 MPRs can be connected to the PLC or host computer via a twisted shielded pair. Note: Terminate serial link cable with 120-Ohm resistors at both ends. The MPR-6/3 system is user expandable. No special engineering skills or tools are required. For larger systems a Data Highway enables multiple MPR-6/3 connection. The system also performs high-speed data acquisition Users therefore have a simple and friendly means of building a fully integrated monitoring and control systems An optional basic communication package is available. The package includes: 1. Windows (3.11 & 95) based package 2. Two meter cable with RS-232 to RS-485 Converter 3. Communication Manual

MPR-6

MPR-6 Modbus Communication

RS 232-485

M P R-6

M P R-6

M P R-6

M P R-6

M P R-6

M P R-6

120ohm

120ohm

Technical Specifications

27

Auxiliary Power Supply 110VDC. Consult factory for 230VAC (165 - 260V), 115VAC (88 - 125V), (to be specify). 45 to 65Hz. Power consumption: ≤ 10VA Current Measurement (three currents) Method : True rms. Range: 0.05 to 12 * phase CT Primary amps setting. Note: I1 is used to measure mains frequency. Lower (< 0.05) current may cause wrong frequency measurement which may cause inaccurate currents and voltage measurements. Full scale: 12 * phase CT Primary amps setting. Accuracy : ± 1.5% , for 0.9 to 1.5 * CT Primary amps setting.

± 5% above 1.5 * CT Primary ± (3% + 0.02 * CT Primary) below 0.9 * CT Primary

Power consumption: ≤ 0.1VA per 1A at 1Amp. input, (Input impedance ≤ 100mΩ) ≤ 0.5VA per 5A at 5Amp. input, (Input impedance ≤ 20mΩ)

Directional Ground Fault 3Vo measurement Method : True RMS. Rated input Voltage 110V / 190V. Measurement Range: 5V to 30V. Measured with 200mA / 1.5mA ZCT. Full scale: 30V. Accuracy : ± 3% of full scale. Input impedance: ≥ 50KΩ Allowed input range: <= 220VAC (saturated, no damage) Phase accuracy: ± 10° Directional Ground Fault Current measurement (ZCT primary current) Method : True RMS. Measurement Range: 0.1 to 1.0A at ZCT Primary, when measured with 200mA / 1.5mA ZCT. 0.75mA to 7.5mA at ZCT secondary. Full scale: 1A (saturated, no damage). Accuracy : ± 3% of full scale. Input impedance: ≤ 10Ω Allowed input range: <= 1A at ZCT secondary (at relay input terminals). Phase accuracy: ± 10° Thermistor Input RTD Input Range: 0.1 - 30KΩ. Range: 100 - 240Ω or 0°C - 250°C Accuracy: ± 0.1KΩ up to 5KΩ, ± 3% above 5KΩ. Accuracy: ± 3% of resistance. Time delay: 2 Sec Max wire resistance: 25Ω. Time Delay 2 Sec. Overload Alarm and Trip Curves (both heating and cooling) Fault time accuracy: ± 1 Second up to 10 seconds.

± 1 second ± 2% above 10 seconds. Threshold current level : OVERLOAD PICKUP ± 1.5%. Total Run Time Accuracy: ±2%. Current Unbalance Alarm and Trip Method: Unbalance = 100 * (Imax - Imin) / Ir [%] Where: Imax = max. of the three phase currents.

Imin = min. of the three phase currents. Ir = larger of (Imax , Motor FLC setting).

(to prevent nuisance tripping at low current levels) Alarm Threshold unbalance alarm level: 50% of Unbalance Current setting ± 2%. Alarm (fixed) time delay: 5.0 ± 0.5 Sec. Trip Curves Threshold unbalance trip Level: Unbalance Current setting ± 2%. Trip time accuracy: ± 1 Second up to 10 seconds.


28

± 1 second ± 2% above 10 seconds.


29

Fault Time Delays Accuracy: ±0.5 Sec. or ±2% of time, which ever is greater, for all but the above mentioned faults and the

following exceptions: - O/C Level 2: -0.1/+0.2 Sec. for less than 1Sec. delay.* - Ground Fault Level 2: -0.1/+0.2Sec. for less than 1Sec. delay.* * When adjusted to 0 60 ט mS ± 30mS.

Relays Contacts Rated load: 8A/250VAC 1800VA. 48Vdc, 0.25A Inductive 48Vdc, 1.0A Resistive Maximum voltage: 250VAC. 125Vdc, 0.15A 125Vdc, 0.4A Dielectric Strength 1500VAC, for 1 minute, Between Ground (terminal 18) and:

* Current inputs. * Auxiliary power supply inputs * Control terminals

Temperature Range 0°C to +50°C (default - all units), -10°C to +60°C (by special order) Designed to meet following Standards Impulse : IEC 255-4 (1976) & Amend #1 (1979)

IEC 255-5 (1977) 5 kV common-mode test

5 kV transverse-mode test Surge withstand :

Oscillatory 2.5 kV peak Fast transient 4 kV crest voltage In accordance with: ANSI C37.90.1 (1990), IEC 55-4 (1976) & Amend #1 (1979) Class III, IEC 255-22-2 (1988) Class III

RFI : In accordance with EMI standard ANSI C37.90.2

Dimensions (mm)

30

86.4

107Cut-Out

92

138

144

96

mpr 6 3 dgf instruction manual

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