mndbme03.pdf

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R.T.A. s.r.l. MNDBME03 01/09

MOTION CONTROL SYSTEMS

MIND B SERIESSTEPPING MOTOR DRIVES

INSTRUCTION MANUAL

R.T.A. s.r.l.

Via E. Mattei Frazione DIVISA27020 MARCIGNAGO (PV)Tel. +39.0382.929.855 - Fax +39.0382.929.150

Internet: http://www.rta.it- e-mail: [email protected]

R.T.A.DEUTSCHLAND GmbH

Bublitzer Strae, 3440599 DSSELDORF (Germany)Tel. +49.211.749.668.60-Fax +49.211.749.668.66Internet: http://www.rta-deutschland.dee-mail: [email protected]

R.T.A. IBERICAMOTION CONTROL SYSTEMS S.L.

C/Generalitat 22, 1 308850 GAVA BARCELONA (Spain)Tel. +34.936.388.805-Fax +34.936.334.595

Internet: http://www.rta-iberica.ese-mail: [email protected]


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INDEX

1 - NOTICES AND MANUAL STRUCTURE...................................................................3

2 - LIMITATIONS, HAZARDS AND CAUTIONS................................................43 - GENERAL CHARACTERISTICS AND IDENTIFICATION ........................................64 - INPUT AND OUTPUT LOGIC SIGNALS ..................................................................75 - POWER INPUTS AND OUTPUTS............................................................................86 - SETTING AND SIGNALLING ...................................................................................97 - DRIVE EXTERNAL CONNECTIONS......................................................................11

8 -

INSTALLATION AND ENVIRONMENT......................................................129 - LOGIC INTERFACING EXAMPLES .......................................................................13

10 - APPLICATION NOTES..............................................................................14

Symbol meaning

The section marked with this symbol contains warnings regarding safety problems. If the directionsindicated in these sections are not fulfilled, it could arise hazardous situations .

The section marked with this symbol contains information regarding operations which are strictlyforbidden.


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1 - NOTICES AND MANUAL STRUCTURE

1.1 - This manual covers the following items:

MIND B series stepping motor drives in all their standard versions.

Standard characteristics of special versions of MIND B series stepping motor drives (see chapter1.2).

For models and versions identification see also chapter 3.

1.2 - For the purposes of this manual the terms used assume the meaning below described (see fig. 1).

Control system(PLC, CNC or others)

Steppingmotor drive

Electricalsupply

Movementmechanical

system

External commandsand/or sensors

Steppingmotor

Fig. 1

Drive: electronic part of an electromechanical motion system, which receives some digital oranalog input signals from an external control system and gives to the stepping motor thesuitable phase excitation sequences, in order to obtain the mechanical movements required by

the control system. The drive can also communicate its status to the control system throughsome logic signals. In this manual we consider the drive as a BDM (EN 61800-3, chap.3, Fig.1).

Control system: part of the machine which decides and controls all machine functions and givesto the drive all execution commands. It could be a numerical or programmable control, apersonal computer or a specific control card. In the simplest machines it could also be a groupof sensors and electromechanical switches.

Electrical supply: all machine parts suitable to supply the drive in a correct way; usually rectifier,filter capacitor, transformer separating from the main, anti-interference filter and all switches andprotection systems.

Standard drives are all models (see chapter 3 for identification) whose characteristics complycompletely with those described in this manual. Special versions are all models in which some

characteristics differ from the description given in this manual. For these models, some part ofthe manual does not apply and, in these cases, you must have the specific "variation sheet"which becomes an integral part of the manual itself.

1.3 - Products described in this manual (see list in chapter 1.1 and identification code in chapter 3) are CEmarked and comply with the following directives:

1) Low Voltage (73/23/EEC and further modification).

2) Electromagnetic Compatibility (89/336/EEC and further modification).

1.4 - Remember that, as stated in all directives, compliance exists only when a product is used inaccordance with its destination and following manufacturer prescriptions. Thereby, all relevantindications about use, cautions, installation and limitations here described must be followed by user

in order to stay within compliance limits: from this point of view, chapter 2, 8 and 10 are particularlyimportant, but the entire content of this manual has to be carefully read and considered in order toobtain the information necessary for a correct use.


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1.5 - Conformity declaration regarding above mentioned products is kept by R.T.A. (as manufacturerresiding in EEC country) together with technical construction file at authority disposal.

1.6 - This manual is conceived in a way to offer to the personnel involved in project and safety verificationof a machine all information concerning characteristics, working conditions, application limits and

cautions about MIND B series stepping motor drives. The knowledge of this information is essentialfor a correct project of machines, apparatus and systems in which the drives are used; it is stronglyrecommended not to start any operation with the drives before you have completely read andunderstood the content of this manual; if you find some part of this manual not completelyunderstandable or lacking regarding your particular application, do not hesitate to contact directlyR.T.A. that can provide, if necessary, further information in order to make the user able to design hismachine and the related safety systems in the best way. Take into account that an incorrect use orinstallation, a wrong dimensioning of external safety elements related with the drive could bring toeconomical damages and also to hazards for human life.

1.7 - Consider the fact that these are products with a very wide range of possible applications in manydifferent working and environment conditions. For this reason this manual can only fix limits andgeneral rules but cannot take in consideration every single possible application condition. If you haveproblems to understand some part of this manual or to meet its indications with your specificapplication, do not hesitate to contact R.T.A. for further information. Take into account that R.T.A.has twenty years of experience in any kind of applications, which cannot be condensed in a manualbut can always be at customer disposal.

1.8 - The terms "user and customer" often used in this manual always indicate a skilled person as definedin chapter 2.9.

1.9 - This manual is considered valid at the moment of the selling of the product. It cannot be consideredinadequate as a consequence of product or manual changes or improvements after the selling.R.T.A. reserves the right of products and manual revisions without notice neither obligation ofprevious products and manuals revision.

2 - LIMITATIONS, HAZARDS AND CAUTIONS2.1 - MIND B series drives are suitable to drive two phases stepping motors with 4, 6 or 8 terminals with a

phase-inductance range between 1 mH and 15 mH. Their use for different purposes is not allowed.

2.2 - It is not allowed the use of these drives for any purpose different from the one above indicated.

2.3 - It is also not allowed the use in any condition not complying with one or more specific limitationsstated in this manual for electrical, mechanical and environmental quantity or characteristics.

2.4 - MIND B series drives are classified as protection degree IP20 (EN60529). This means that theymust be located inside a protective enclosure meeting requirements of standards applicable in thespecific application in which they are used.

2.5 - MIND B series drives have some dip-switches. They perform some adaptations (to the particular

motor, to application, etc). All these settings have to be made with the machine switched off,before putting it in service; none of them requires the machine switched on.

2.6 - MIND B series drives and related power supply contain capacitors able to store a certain amount ofelectrical energy. As a consequence, in some cases, according with application conditions andsupply dimensioning, a dangerous voltage could remain on the drive, after switching off, for a timegreater than 5 seconds. So it is recommended to wait an adequate time before working on the drive.

2.7 - The heatsink can reach high temperatures during normal working conditions (for example about 80C). Do not touch this component for some minutes, after switching off, in order to avoid scaldhazard.

2.8 - After a failure due to connection mistakes or others, in the drives could arise a temporary hot spot.For this reason avoid absolutely to install in explosive or flammable environments. Avoid also to

install near easily flammable materials and components;we recommend to verify that all thecomponents located in the enclosure are realized using self-extinguishing materials.


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2.9 - All products considered in this manual are sub-assemblies without a direct function, foreseen to beintegrated in a more complex machine or installation by a professional assembler. MIND B seriesdrives are conceived for restricted distribution (EN 61800-3 Ch. 3.2). Direct use of these products bya final user is not allowed. The professional assembler using this material has to be a skilled person,adequately qualified both in the generic field of electrical and electronic systems and in the specific

field of stepping motor systems. It is exclusive responsibility of the designer of the complete machineor installation in which this component is used to take care of the safety and reliability of his project.It is forbidden to use this material in application covered from one or more EEC directives (forinstance 89/336/EEC, 89/392/EEC, etc.) before the conformity to those directives has been declared.Regarding 89/336/EEC directive, see chapter 10.

2.10 - Use for safety related functions is forbidden (EN 60204-1). Moreover, when the applicationarrangement is in such way that a drive fault or failure could generate a dangerous condition,external independent safety protection system must be provided in the machine.

2.11 - In some case of drive failure, dangerous high voltage could appear at logic low voltage input andoutput terminals, even if this event is extremely rare. For this reason, from the point of view ofevaluation of the machine safety during a single fault condition, the external control system,connected to these inputs, has to be considered potentially subjected to high voltage, unless an

external separation is provided.

2.12 - Both CURRENT OFF input signal (see chapter 4) and internal electronic functional protections (seechapter 6) switch off the drive output power by means of semiconductor devices. They cannot beused to interrupt power in emergency stop function or in any function involving personnel safety.


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3 - GENERAL CHARACTERISTICS AND IDENTIFICATION

3.1 - DIMENSIONS

20 20

173

180

53

205

5

MINDseries

C2

C1

FAU

TER

HV

S2

V-

S1

V+

B-

A-

A

B

DP1

Fig. 2 Dimensions: all measures in mm.

3.2 - IDENTIFICATION

The models identification of MIND B series drives is as follows:

MIND BX.Ywhere:

X can be: 2,3, 4, 5 and identifies a standard model, differing for current value.

.Y is not present in standard models. If present Y can be a number or an alphanumericcharacter identifying a special version with some variations with respect to standard models.

Each sample is also identified with a serial number.


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4 - INPUT AND OUTPUT LOGIC SIGNALS

All input and output logic signals are optically insulated among them and from internal power circuits.Positive and negative terminals are separately accessible. For all logic signals in the following we indicatethe corresponding numbers of connector C2. An input signal is considered ON when a voltage as indicated

in fig. 3a is applied.21(-) and 20(+) CURRENT OFF INPUT:when this signal is ON drive is active. When it is OFF drive is

inhibited, thus motor current (and so holding torque) is turned to zero.19(-) and 18(+) DIRECTION INPUT: with this signal ON motor rotation direction is opposite to the one

obtained when this input is OFF. This signal has to be valid at least 100 sec before STEPsignal and has to stay in this state for at least 100 sec after last STEP sent to the drive.

17(-) and 16(+) STEP INPUT: active transition is the OFF-ON transition of this signal. Suggested duty-cycle 50%. Maximum frequency: 80 kHz with square wave signal supplied from an outputable to produce a voltage between 5 and 24 Volt and a current of 15 mAmp.

23(-) and 22(+) STEP x 4:when this input is ON, pulse sent to STEP INPUT is multiplied by four. It can beused with the operation modes marked with a xin table 4 (chapter 4). This signal has to bevalid at least 2 milliSec before STEP signal and has to stay in this state for at least 2

milliSec after last STEP sent to the drive.15(-) and 14(+) DRIVE FAULT OUTPUT:when this output is ON, drive is normally working; when it is OFFdrive is in no-working state. Drive automatically goes in no-working state when someprotection is active and automatically recovers when this protection resets.

GENERAL NOTE: ALL THE ABOVE INDICATED SIGNALS ARE OPTICALLY INSULATED, THEFOLLOWING ONES ARE NOT OPTICALLY INSULATED AND ARE REFERRED TO TERMINAL 24;USING THE SIGNALS BELOW INDICATED YOU LOSE THE GALVANIC SEPARATION.

13 STEP TRANSITION COMMUTATION:connecting this terminal to terminal 11 the activetransition is inverted (from OFF-ON to ON-OFF).

11 +12VDC

auxiliary:12 VDC

auxiliary output (12 mAmp. maximum) useful for a possible inputor output bias together with an internal GND. USE ONLY IF A LOW VOLTAGE SUPPLYIS NOT AVAILABLE.

12 +5VDCauxiliary:5 VDCauxiliary output (12 mAmp. maximum) useful for a possible input oroutput bias together with an internal GND. USE ONLY IF A LOW VOLTAGE SUPPLY ISNOT AVAILABLE.

24 INTERNAL GND:(internally connected to terminals 5, 6, 7 of connector C1). This can beused for the connection of logic signals cable shield when it is required or necessary inconsequence of control system characteristics.

DRIVE

GND1 KOHM

820 OHM

CURRENT OFF, DIRECTION and STEP 4inputs structure scheme

Output structure

DRIVEVmax = 45 VoltImax = 10 mAVsat < 0.8 Volt

Out+

Out-

NOTE:Insert a protection diode in parallel with the loadin case of inductive load

(3a) (3b)

Fig. 3 Inputs and outputs scheme.


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5 - POWER INPUTS AND OUTPUTS

In this chapter drive power input and output and the necessary power supply for drive working are described.

5.1 - Drive power outputs are the four connections to stepping motor. Drive power inputs are the two

connections to VDCnom coming from power supply. All connector C1 terminals are listed in thefollowing Table 1.

Table 1

CONNECTOR C1 DESCRIPTION

1 Motor winding terminal B

2 Motor winding terminal B-

3 Motor winding terminal A-

4 Motor winding terminal A

5 Shield of shielded motor cable

6 GND

7 Power supply negative pole8 Power supply positive pole

5.2 - Earth terminal Earth terminal is in frontal panel inferior part and has to be electrically connected toearth (PE terminal of the machine in which the drive is installed).

5.3 - The terminal indicated as GND is the point of motor-drive system that has to be connected to earth (PEterminal) in order to guarantee the correct operation of some drive protection systems. No other pointat a different potential both of logic circuit and power circuit has to be connected to earth; particularlydo not connect to earth transformer secondary winding. Other points at the same potential of GNDcould be connected to earth using the cautions suggested by classical techniques to obtain a correctlocation of multiple earth connections. Shielded cables both of logic signals and motor outputs must beconnected to points at the same potential as GND. Besides consider that GND terminal is internallyconnected to terminals 5 and 7 of C1 and to terminal 24 of C2. See connection schemes of fig. 5, 10and 11.

5.4 - Table 2 shows power inputs and outputs characteristics:

Table 2 MIND B2 MIND B3 MIND B4 MIND B5

VDCmin (VOLT) 42 75 85

VDCnom (VOLT) from 55 to 85 from 95 to 140 from 120 to 180

VDCmax (VOLT) 102 170 220

INP

min (AMP) 2.28 5.7 4.55 6.7

INP

max (AMP) 4 10 8 12

INPstep (AMP) 0.57 1.4 1.15 1.8

Dimensions (mm) 180 x 53 x 173

5.5 - Definition of terms used in table 2:

VDCmin e max : minimum and maximum supply voltage for drive operation; under and over this voltageautomatic protections will inhibit drive operation.

VDCnom : nominal value of DC voltage supply (range) at the drive input (terminals 7, 8).

INP : indicates nominal phase current, which flows in each motor winding, measurable withmotor turning at low speed. The drive is equipped with automatic current reduction withmotor at standstill. Phase current is calibrated at final test moment and can be set from thecustomer, choosing among four different values, by means of DIP-SWITCHES.

INPmin e max : minimum and maximum nominal phase current value which can be set by user using DIP-SWITCHES.

INPstep : spacing of the possible current values.


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6 - SETTING AND SIGNALLING

6.1 MIND B series drives are general purpose products which can be used to drive many different motormodels in different kind of applications. For this reason they have a six positions DIP-SWITCH suitableto adapt drive characteristics to the specific motor and/or application. The setting of this dip-switch

has to be made by customer before putting in service the drive. Do not forget to do thesesettings: wrong setting could get application errors and also motor damages and hazards. Ledsignalling drive status are also present.

6.2 - Fig. 4 shows the position of DIP-SWITCH, signalling LEDs, connectors and labels in MIND B seriesdrives.

C1

DIP SWITCH

DP1

YELLOW

C2

Fig. 4 Dip-switches, signalling leds and connectors.


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6.3 - Table 3 shows the setting of dips 1, 2 as a function of motor nominal current suitable to a specificapplication.

Table 3 NOMINAL CURRENT (Amp)

DIP 1 DIP 2 MIND B2 MIND B3 MIND B4 MIND B5

ON ON 2.28 5.7 4.55 6.7ON OFF 2.85 7.1 5.7 8.6

OFF ON 3.42 8.6 6.85 10.3

OFF OFF 4 10 8 12

6.4 - Table 4 shows the setting of dips 3, 4, 5 and 6 as a function of required operation mode.

Table 4 OPERATION MODE (steps/rev)

DIP 4DIP 3 EQUALIZATION DIP 5 DIP 6

ON OFF

ON EXCLUDED ON ON 4000X 3200X

OFF ACTIVE ON OFF 2000X 1600X

OFF ON 1000 800

OFF OFF 500 400

= default factory setting.

X= in this operation mode STEP x 4 INPUT can be activated.

6.5 The following list and table 5 show the meaning of the signalling LEDs existing on the drive.

LED HV : ON = supply voltage inside correct operating range.OFF = drive not supplied or supply voltage out of the correct range (in the second case you

have also LED FAU ON).

LED TER: ON = drive placed in no-working state by thermal protection (in this case LED FAU is ON).

OFF = heatsink temperature in working range.

LED FAU : ON = drive placed in no-working state by one of the following protection:

a- Thermal protection if LED TER is ON.b- Max or Min supply voltage if LED HV is OFF.c- Short circuit or wrong motor connection if LED HV is ON and LED TER is OFF.

OFF = drive in working state if LED HV is ON.

Table 5

LED HV LED TER LED FAU DRIVE CONDITION

OFF OFF OFF Drive not supplied or fuse broken

OFF OFF ON Wrong supply voltage

ON ON ON Thermal protectionON OFF ON Short circuit at motor output or drive broken

NOTE: OFF = LED switched off;

ON = LED switched on.

All protections are self-resetting, when the intervention causes disappear.


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7 - DRIVE EXTERNAL CONNECTIONS

7.1- Dimensioning power for transformer, bridge rectifier, filter capacitor and related external components.The basis to calculate this power is the total power required from drive and motor. It is the sum of thefollowing terms:

- Mechanical power delivered to load: mainly depending on application characteristics likefriction, inertia, efficiency of mechanical transmission etc.

- Motor losses: mainly depending on motor type, drive voltage, speed and duty cycle.

- Drive losses: mainly depending on drive model, current setting and duty cycle; accordingwith these parameters these losses can approximately vary between 60 and 130 Watt. It isoften very hard to do an exact forecast of drive and motor losses; in these cases a safetyover-dimensioning of the supply elements proportional to the uncertainty of the data isrecommended. To get more accurate information, contact R.T.A. describing all the data ofthe particular application. Obviously if a single power supply is used for more than one drive,the calculated power for the dimensioning has to be the sum of single drive powers.

7.2- In the schematic diagram of fig. 5 it is shown the possibility to use a single-phase group or, inalternative, a three-phase group. The choice between the two solutions depends on technical and

economical considerations hard to summarize. Generally speaking a three-phase group is stronglyrecommended when the total required power overcomes one of these two limits: 500 - 600 Watt meanpower and 700 Watt peak power. Please consider this only as a rough indication.

7.3- C capacitor value has to be calculated in a way to get an adequate ripple voltage level; in any case,also if the ripple level value is fulfilled, this component can never have a capacitance below the onegiven by the following formula:

N x Cmin

in which: N= number of drives connected to the same power supply.

Cmin = 1500 F (MIND B4, B5); 3300 F (MIND B2, B3)7.4- C capacitor must have a working voltage at least equal to the working voltage chosen for the drive and

must have a relatively low impedance at high frequency.

7.5- R1 resistor purpose is to discharge C capacitors when the system is switched off, avoiding the riskthey remain indefinitely charged at high voltage. Remember that, in these cases, you must put aclear label in your installation in order to warn the operators of the residual voltages risk.

7.6- Transformer TR must fulfil to the following requirements:

7.6.1- Supply through a transformer secondary winding the correct voltage. These VACvalues are intendedas measured at secondary terminals in no load condition and with primary voltage at its nominal value.Maximum voltage drop at full power load must be less than 5%.

7.6.2- Grant the separation between the drive circuits and the main. Remember that connection of drive

circuits with the main is strictly forbidden. The use of autotransformer is strictly forbidden.

7.6.3- Grant the separation between the drive circuits and all other circuits of the same machine. Thismeans that the transformer secondary dedicated to drives has to be used exclusively fordrives.

7.7- Indicated protection devices must perform the protection of power supply: they have to be slow actingfuses, whose nominal current has to be chosen in accordance with supply dimensioning power. Takeinto account that the drive has an electronic protection against short circuit on drive power inputterminals and an internal protection realized using an acting fuse in case of drive failure.

7.8- The cross-sectional area of conductors used in power supply circuit must be chosen according withdimensioning power (see 7.1). The cross-sectional area of the four shielded conductors betweenmotor and drive must be chosen in accordance with nominal current which has been set in the drive.


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Steppingmotor

MAIN(220 o 380 VAC)

PE

T

PE

+C

Shieldedcable

R1

+VDC nom

-VDC nom

TO OTHER DRIVES(IF PRESENT)

WHITE DIODES AREPRESENT ONLY WITH

THREE-PHASE TRANSFORMER

GND

VAC

SWITCHING ANDPROTECTION

SYSTEMS

EMI FILTER

TRANSFORMER

PE

DRIVE CHASSISEARTH

1

2

3

4

5

6

7

8

Shield

A

A -

B

B -

GND

-VDC

+VDC

PE

METAL CABINET

ENCLOSING THE SYSTEM

LENGTH OF CONNECTION BETWEEN C CAPACITORAND TERMINALS 7 AND 8 = MAX 60 cm

1112131415161718192021222324

Step x 4

Dir. In

Fault Out+

-

+

-

C. Off In+

-+

-

+

-Step In

GND

+ 12 V aux+ 5 V auxStep trans.

Fig. 5 Drive external connections scheme.

8 - INSTALLATION AND ENVIRONMENT

All products considered in this manual have the following common characteristics:

8.1 - Protection degree IP20 (EN 60529): it is user responsibility to provide an adequate protectionenclosure suitable to meet the standards regarding the specific application in which the products areused.

8.2 - Direct connection with the main is not allowed. Transformer separation is mandatory.

8.3 - Installation and work environment. Installation is allowed in a micro-environment with:

Environment conditions class 3K3(IEC 721-3-3): that implies, among other things, a workingtemperature from +5C to +40C and relative humidity from 5% to 85% non condensing.

Pollution degree 2 (IEC 664-1): that implies, among other things, that installation inenvironments in which explosive and/or flammable and/or chemically aggressive and/orelectrically conductive gas, vapor or dust could be present is strictly forbidden.


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Mechanical conditions class 3M1 (IEC 721-3-3).

If the environment in which the machine is used does not satisfy these conditions, suitableconditioning systems have to be provided for the enclosure.

8.4 - Storage environment in original enclosure:

Temperature: from -25C to +55C. Relative humidity: from 5% to 95%.

Environment conditions class 1K3 (IEC 721-3-1). Pollution degree 2.

8.5 - The drives generate some amount of heat (see chap. 7.1). Take care of this in considering the totalamount of heat generated in the enclosure in which the drives are located. In order to make easierair circulation in the drive, install the drive vertically (not turned upside down) with at least 5 cm offree space over and under the drive and 1 cm to the left and the right of the drive. Do not obstruct airgratings.

9 - LOGIC INTERFACING EXAMPLES

In this chapter some interfacing techniques are shown. They have to be considered only as examples. Thebest way to interface the drive with the control system can be chosen only with a complete knowledge ofcontrol system and application needs.

MIND B SERIES

DRIVE

V+

CONTROL

SYSTEM

CONTROL

SYSTEM

MIND B SERIES

DRIVE

V+

Fig. 6 Interfacing a MIND B logic output and an input of a control system operating at V+ voltage.

MIND B SERIES

DRIVE

V+

Fig. 7 Driving a micro-relay by means of a MIND B logic output.


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CONTROL

SYSTEM

MIND B SERIES

DRIVE

V+

Fig. 8 Driving a MIND B logic input from a control system with a NPN open collector output.

CONTROL

SYSTEM

MIND B SERIES

DRIVE

V+

Fig. 9 Driving a MIND B logic input from a control system with a PNP output.

10 - APPLICATION NOTES

10.1 - Drive (or drives) power supply can not be used to supply other machines.

10.2 - MIND B series drives are BDM (Basic Drive Module) conceived for restricted distribution (EN 61800-3). This means that R.T.A. has the responsibility to verify the products compatibility in some typicalway of use in order to give correct installation information. In any cases, it is responsibility of theprofessional assembler, who installs this product, to verify the compatibility of the complete machineor system.

10.2.1 - The set consisting of drive, motor, transformer and all related cablings are source of electromagneticinterferences. The assembler of installation must consider these problems during the project of theplant where the drive (or drives) will be installed in order to shield and/or reduce these interferences.Tests performed by R.T.A. show that the most effective measures able to reduce these interferencesare the following:

Shielding of cables for the connection between motor and drive. The shield of this cable has tobe directly connected to MIND B series drive terminal 5. This shielding can be avoided only incase of very small and compact machine where motor, drive and related connections arelocated in the same enclosure, equipped with an adequate shield.

Connect earth line to motor chassis. From the point of view of radio-frequency emissionsshielding, it is usually sufficient the connection to machine chassis assured by mounting flangesand screws, as long as both screws and chassis are made of conductor material and the

chassis is connected to earth. See fig. 10. Location of motor-drive set in a single container shielding from electromagnetic interferences.


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Use a power supply with a transformer with a metallic shield, connected to earth, interposedbetween primary and secondary winding.

Interpose a filter between the transformer primary and the main (220 or 380 VAC). The filter isused to reduce conducted electromagnetic interferences. Filter characteristics in a specific

installation depend on following factors:- Strictness degree of the specific standard regarding the machine on which drive is used.

- Power level of application (voltage and current setting of the drive).

- Presence of other filtering systems in the general electrical machine installation.

In any case, following filter types are recommended:

- CORCOM VDK series for single-phase power supply.

- CORCOM FCD10 series for three-phase power supply.

Different models inside these series differ for current rating; thereby choose the specific modelaccording to power level of your installation.

Consider that the position of the filter in the system is particularly important: no electromagneticcoupling must exist between circuits up the filter and circuits down the filter; if such coupling ispresent, the effectiveness of filter could be strongly reduced.

All earth connections above mentioned have to be realized in a way to present the less possibleinductance.

10.2.2 - Considering drive logic input signals immunity from external noise present in the environment inwhich they are most often used, take in account following normal procedures, suggested from theclassical techniques for relatively fast signals treatment:

Use shielded cables.

When cables length exceeds 5-6 meters, prefer "buffer" type driving signals instead of "opencollector" type.

Keep signal cables separate from power cables. In particular keep signal cables separate frommotor output cables.

Verify carefully logic level compatibility when interfacing drive with control system.

10.2.3 - A correct accomplishment of these procedures constitutes an essential starting point in order torealize an installation which complies with the requirements of 89/336/EEC directive. The effectivecompliance with specific standards covering the particular application in which this drive is used willhave in any case to be proved in the complete installation, because the effectiveness of suggestedactions depends also on machine topology and on their correct fulfilment. Tests performed by R.T.A.simulating typical installations and following above mentioned indications show that it is possible tostay within the limit of EN61800-3 standard.

10.2.4 - In some cases, due to the characteristics of particular installations, conflicts between groundconnections necessary for shielding purposes and ground connections necessary for safety reasonscould arise. Remember that, in such cases, prescriptions regarding safety take priority, butremember also that, in the great majority of cases it is possible to find a solution meeting bothprescriptions; R.T.A. is at disposal for further information about these problems.


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PE

Steppingmotor

To Drive

WRON

G

PE

SteppingMotor To Drive

RIGHT

D

D distance as shortas possible

(few centimeters)

Fig. 10 Shielded connection at stepping motor side.

PE

To motor

Drive

WRON

G

MIND

To motor

PE

Drive

RIGHT

D

D distance as shortas possible

MIND

Fig. 11 Shielded connection at drive side.

mndbme03.pdf

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