UFS 15-22-40-110 UFS15J-22J-40J BRAKING UNIT SCS Static Control Systems

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UFS 15-22-40-110 UFS15J-22J-40J BRAKING UNIT SCS Static Control Systems | Manualzz

SCS Static Control Systems

El ectroni c and Automati on

UFS 15-22-40-110

UFS15J-22J-40J

BRAKING UNIT

Mod. S04P01M05 Rev 00

File:

NT348E05 Rev. 05

Sign.

Date.: 13/12/01

Prepared by: P.SALA

Page 1 of 21

Verified by: F.MOLINELLI

S.C.S. Static Control Systems

CONTENTS

0. WORK SAFETY.............................................................................................................. 3

0.1 EMC Requirements .................................................................................................................. 4

1. WORKING DESCRIPTION ............................................................................................. 5

1.1 Alarm leds ................................................................................................................................ 6

1.2 Switching ON and OFF............................................................................................................. 6

2. MODEL AND DIMENSIONS ........................................................................................... 7

2.1 Outline dimensions................................................................................................................... 7

2.2 Wiring terminals........................................................................................................................ 7

2.3 Installation ................................................................................................................................ 8

3. CONNECTIONS.............................................................................................................. 9

3.1 Connections UFSxx/UFSxxJ .................................................................................................. 9

3.2 Assembly in the electric cabinet ............................................................................................. 10

4. FEATURES AND PERFORMANCES .......................................................................... 11

4.1 General Technical Features ................................................................................................... 11

4.2 Features of UFSxx version ..................................................................................................... 11

4.3 Dissipated power by UFSxx versions ..................................................................................... 11

4.4 Exclusion of the thermal relay and continual service working................................................. 12

5. STANDARD APPLICATION TABLE ............................................................................ 13

5.1 Standard braking resistances (SCS KIT)................................................................................ 13

6. BOARD THERMAL DIMENSIONING ........................................................................... 14

7. VARIANTS AND CONFIGURATIONS......................................................................... 15

7.1 Technical features of the UFSxxJ version .............................................................................. 15

7.2 Max. dissipated power – UFSxxJ version ............................................................................... 15

7.3 Standard applicative table for UFSxxJ ............................................................................... 15

7.4 Starndard brake resistors for UFS xx J.................................................................................. 16

7.5 Configuration of the UF braking voltage by means of the DIP-SW ........................................ 16

7.6 Suggested settings for standard mains voltages (dip-switch SW1)........................................ 17

7.7 Min. brake resistance values with SW1 in various positions................................................... 17

8. CONNECTION TO MORE BRAKING UNITS ON AN INVERTER................................ 18

8.1 Connections of more units in synchronism (master/slave). Application notes ...................... 18

NT348E05 Date 13/12/01 Page 2 of 21

S.C.S. Static Control Systems

0. WORK SAFETY

STATEMENT

This braking unit was designed, based on the EEC directives applicable to it, that is to say:

• Low voltage directive No. 73/23 - 93/68

• Machine directive 89/392 - 91/368 - 93/44

UL - CSA compliance

All braking unit models (listed below) are bult in compliance with UL – CSA safety standards (UL

508-C: file n. E213814).

Product Covered: UFS15 - UFS15J - UFS22 - UFS22J - UFS40 - UFS40J – UFS110

This is a complex component aimed at being integrated into the equipment by skilled staff only.

This equipment can be used in industrial areas only.

It must be connected to the relevant inverter. It can cause troubles to radio-frequencies.

This equipment must be used, installed and managed by skilled and qualified staff, familiar with its application and working. The usage will be compliant with provisions stated in:

PRODUCT STANDARDS (if set)

BASIC CEI EN 60204-1 STANDARD

RUNNING

THIS

To the safety purpose, some basic provisions should be recalled:

ALWAYS FORESEE A SECTIONING MEAN FROM THE POWER SUPPLY NETWORK

PROVIDE ELECTRIC AND NON-ELECTRIC GUARDS TO PREVENT DAMAGES TO

PEOPLE AND GOODS IN CASE OF EQUIPMENT FAILURE.

SCS rejects any responsibilities for direct and indirect damages linked to the unproper usage of this option.

DANGER: ELECTRICAL SHOCKS

NOTE: The contents of this manual when printing it, is to be considered as correct.

However the manufacturer is entitled to change its contents without any notice.

NT348E05 Date 13/12/01 Page 3 of 21

S.C.S. Static Control Systems

0.1 EMC Requirements

Even if SCS considers this product as a complex component this braking unit was designed to match requirements as per provisions in CEI EN 50081-2 standard (Emission) and CEI EN

50082-2 standard (Immunity). It was tested in an independent laboratory and trials gave a positive outcome. Consequently, the CE mark on the product serial number label is valid both for the CE

LVD 73/23 93/68 directive (low voltage, safety) and for the EEC EMC 89/336 directive

(electromagnetic compatibility).

This equipment is an outside option for inverter and works in a strict coordination with its related inverter from which it receives control and power supply.

Since there is no direct connection with the power supply network, this equipment contribution to

EMC emissions is negligible since these latter are fully absorbed by the inverter power supply filter (refer to the inverter user’s guide).

Mount the braking unit close to its relevant inverter, minding to create with this a mutual low impedance and high frequency earthing (ex. the surface of the mounting plate). The connection to the braking resistor must be as short as possible and will be performed using a braided or shielded cable. Braking resistor will have a metal screen or will be armoured in order to filter emissions. To have further execution detail, please apply to our guide NT247.

The end verification in the conformity of emission and immunity EMC standard for the specific product and/or to the full installation applicable to it, are under the manufacturer’s and/or the end installer’s province.

NT348E05 Date 13/12/01 Page 4 of 21

S.C.S. Static Control Systems

1. WORKING DESCRIPTION

The UFS braking units are conceived to be joined with the Mitsubishi inverter, FREQROL and

MELTRAC series. However, they can be used with inverters or converters equipped with BUS-

DC.

These packages aim at dissipating, through a control chopper, the energy coming from the load

(kinetic energy during the braking phase). Normally, this energy produces a rise of the inverter

Bus DC and this value cannot exceed a given limit. The instantaneous power that can be absorbed is sent to a group of power resistors. Every group is self-supplied by the inverter Bus

DC.

The UFS braking units are equipped with circuit for synchronization (through the two-wire cable connection) for the Master/Slave connection of more parallel units. By means of this circuit it is possible to increase the total brake power, connecting more units – also of different sizes - to the same BUS-DC, provided that each unit is connected to the resistor group that is specific for that UFS size.

In order to protect the external braking resistors,on the UFS standard unit a suitable electromechanical thermal relay is mounted with insulated auxiliary contacts which are available to operate the alarm sequences.

For the brake unit protection, on the heat sink a bimetal thermostat is mounted and internally connected, whose intervention causes the temporary deactivation of the unit.

The braking power is to be dimensioned in function of the actual braking cycle, considering pauses. The braking power is given by:

P

=

1

2

Jw

2

*

1 t brake

(1 rad/sec = 9,55 rpm)

Power ‘P’ in watt, speed ‘W’ in rad/sec, time ‘t’ in sec., moment of inertia ‘J’ in Kg*m

2

to the motor axis.

Obviously, the stated power is to be reduced by the power necessary for the working. This latter contributes to brake the load. In its turn, the motor thermally absorbs 10% approx. of the nominal power, due to its inside leaks. Considering pauses, the mean power will become:

BRAKING BRAKING

P

(I)

PAUSE t1 t2

P

M

=

P

*

t

1

t

2

Ieff

=

I

*

t

1

t

2

NT348E05 Date 13/12/01 Page 5 of 21

S.C.S. Static Control Systems

Used resistors must be able to dissipate at least the continual service power. The power values shown on the table provide for a quite hard engagement (braking for 15 seconds approx. and 150 seconds pause). These can be reduced provided that the application requires it. In this event, the thermal relay is to be delayed in function of the maximum power that every resistor can dissipate.

I

=

R

1.1 Alarm leds

The green ‘ON’ led, states that the braking unit is supplied by the DC source. Usually, it is lighted.

The red ‘BR’ led lights on when the unit transfers energy coming on the load on resistors. Usually it is switched off, but it blinks when the unit is working.

1.2 Switching ON and OFF

The unit is equipped with a circuit which directly takes the power supply from the BUS-DC to which it is connected (P and N terminal boards). In order to avoid spurious switching ON of the braking circuit, the inside enabling is delayed by 1 sec versus the step voltage arrival of the BUS-

DC voltage to the nominal value.

This delay is not working in case of very short power failures (1,5 sec) or if the rise of the same is very low.

NT348E05 Date 13/12/01 Page 6 of 21

2. MODEL AND DIMENSIONS

2.1 Outline dimensions

W

50

UFS15 / 15J / 22 / 22J / 40 / 40J – UFS110

H

S.C.S. Static Control Systems

240

250

220

L1

M5x15

Variable dimensions according to size

Quote

Model

UFS15,22,40

UFS15J,22J,40J

W

100

L1

/

UFS110 107 270

Weight

H

175 2.5 Kg

195 3.9 Kg

2.2 Wiring terminals

UFS15,UFS22,UFS40,UFS15J,UFS22J,UFS40J

Outside terminal 2,5 sq.mm.

3 = thermal relay common

4

5

= NA inside thermal relay contact

= NC inside thermal relay contact

Outside terminal 6 sq.mm.

P/P1 = Positive terminal of Bus-DC

N

F

= Negative terminal of Bus-DC

= Braking resistors terminal

G/Y = yellow/green terminal for power earth PE

NT348E05 Date 13/12/01 Page 7 of 21

S.C.S. Static Control Systems

Inside terminals can be reached by removing the product transparent cover

M1 terminal on the printed circuit board

M1-1 = Connection inside thermostat

M1-2 = Connection inside thermostat

M4 terminal on the printed circuit board – synchronism command input

M4-1 = INA

M4-2 = INB

M5 terminal on the printed circuit board – synchronism command output

M5-1 = OUTA

M5-2 = OUTB

UFS110

Outside terminal 16 sq.mm.

P/P1 = Positive terminal of Bus-DC

N = Negative terminal of Bus-DC

F = Braking resistors terminal

G/Y = yellow/green terminal for power earth PE

Inside terminals can be reached by removing the product transparent cover

M1 terminal on the printed circuit board

M1-1 = Connection inside thermostat

M1-2 = Connection inside thermostat

M4 terminal on the printed circuit board – synchronism command input

M4-1 = INA

M4-2 = INB

M5 terminal on the printed circuit board – synchronism command output

M5-1 = OUTA

M5-2 = OUTB

The contacts of the inside thermic can be reached by removing the product transparent cover

97-98 = NO contact of inside thermic

95-96 = NC contact of inside thermic

2.3 Installation

The units are designed to work under natural ventilation. When installing the unit, please provide for a sufficient area to make the air circulate. Then match with an assembling pitch by

150 mm. (horizontal) and 400 mm. (vertical).

If the units are installed next to other heat generating units, verify that the air temperature does not exceed the maximum working temperature stated at the paragraph on technical features.

In case they are installed near other apparatuses which emanate heat, please ensure that the ar temperature does not exceed the max. operating temperature, which is indicated in the technical features paragraph.

The UFSxxx units are not protected against short circuit or against wrong connections. A wrong connection of the P, N, terminals, of the resistors, or a wrong value of the same, or the setting of a brake threshold not suitable for the application, can irreparably damage the unit itself or the inverter.

NT348E05 Date 13/12/01 Page 8 of 21

S.C.S. Static Control Systems

3. CONNECTIONS

3.1 Connections UFSxx/UFSxxJ

Common PE

K1

PE

L1 L2 L3

INVERTER

P

N

+

_

PE

Max 3m

P

N

P1

F

+

_

M

RUFC

M1-2

+

-

REF

M1-1

MR-UFS

96 95

97 98

3

Thermal alarm

4

STOP

5

START

K1

K1

THERMOSTAT

UFSxx

to aux supply

Figure 4.1 UFS standard connection

Note: In the UFS110, contacts of thermic relay are not reported in outside terminals, but can be acceded by removing the product transparent cover.

NT348E05 Date 13/12/01 Page 9 of 21

S.C.S. Static Control Systems

3.2 Assembly in the electric cabinet

The units must be connected using the shortest possible cables. The max. absolute length of the

P, N, power cables is 3 meters.

The max. length of the connections of the P1, F, resistor is 5 meters.

The P, N, connections must be carried out using braided cables; they must not be inserted very close (min 150mm) to signal cables which are sensitive to EMC troubles. In case of practical problems, square crossings (at 90° degrees) between power and signal cables are allowed.

NO Yes

Power cable

Signal cable

The same rules are valid also for the connection cables of the brake resistors.

The connection of the earth cable (PE) must be branched , (star type branch), from one single spot (earth bar) together with all the PE connections of the network, of the motor, of the EMC filter , of the inverter, etc.

NT348E05 Date 13/12/01 Page 10 of 21

S.C.S. Static Control Systems

4. FEATURES AND PERFORMANCES

4.1 General Technical Features

Tolerance on the intervention voltage: 0.8%

Hysteresis : about 2%

Ambient temperature 0°C

÷

40°C

Maximum braking time = 10s

Protection degree IP20

Thermal guard with manual / automatic reset

4.2 Features of UFSxx version

Power supply voltage 450Vdc-678Vdc

Maximum voltage 800Vdc

Unit Braking voltage

Maximum peak current IP (A)

Maximum instantaneous power

Pmax (KW)

Standard

Ith (A)

%ED

Max

RF(

Ω min.

)

UFS15

UFS22

UFS40

UFS110

745

745

745

745

18

34

55

140

14

25

41

105

4

÷

6

7

÷

11

12

÷

18

23

÷

32

10%

10%

10%

5%

>40

>22

>13,5

>5,3

Used resistor models must allow a very-high over-chargeability (20/1). Cement-made corrugated belt models are the best.

N.B. The resistors values indicated, are referred to the units setted on the standard threshold voltage (SW-4 = ON = 745V)

4.3 Dissipated power by UFSxx versions

Power dissipated with the unit in stand-by mode @678Vdc: 27W

Power dissipated when braking; @745V ; I = I max

; d.c. = 10% *

UFS15 UFS22 UFS40

33W 37W 42W

UFS110

48W

P.S.: The stated dissipated powers do not include the power dissipated by external braking resistors.

* d.c. = 5% for UFS110

NT348E05 Date 13/12/01 Page 11 of 21

S.C.S. Static Control Systems

4.4 Exclusion of the thermal relay and continual service working

If the thermal relay (external or internal) is unconnected, the braking package can work in continual service at the IC. current. In this event, the outside resistors will be value modified in order that they cannot exceed the IC. Their minimum values will be those shown on the following table:

Unit

UFS15

UFS22

UFS40

UFS110

UFS15J

UFS22J

UFS40J

Resistor for continual service

50

- 14KW in die cast or tungsten

33

- 20KW in die cast or tungsten

25

- 33KW in die cast or tungsten

17

-42KW in die cast or tungsten

25

- 7KW in die cast or tungsten

17

- 10 KW in die cast or tungsten

13

- 15 KW in die cast or tungsten

IC (A)

15

22

30

44

15

22

30

Note: Value of resistors in the table, are vaild only for the units setted at the standard braking threshold (SW-4 = ON = 745V).

See note par. 7.5

The exclusion of the inside thermal relay in the UFS unit includes the changing in the wiring of such relay. The elements of the thermal relay are to be short-circuited using cables of the same section than those present in the unit. The outside resistors are to be guarded with fuses or automatic magneto-thermal switches fit to mounted resistors, and at least with the same IC current, if they are used under this condition.

Use the signaling contact of the internal or external temperature relay, to interrupt the power supply of the inverter and of the unit. See the indicative diagram at par. 3.1

NT348E05 Date 13/12/01 Page 12 of 21

S.C.S. Static Control Systems

5. STANDARD APPLICATION TABLE

In the below table is reported an indicative pairing, obtained from the motor power and from the braking torque percentage in comparison with the rated torque. The pairing is only indicative and, to be sure that the braking units application will not cause problems, it is necessary to check the machine while operating or to calculate exactly the regenerative energy during the braking phase.

Braking torque

Motor power

(kW)

5,5 7,5 11 15 18,5 22 30 37 45 55 75 90 110 132 160 220 280

150 % - 5 sec.

UFS 15

100% - 15 sec.

UFS15/UFS22

UFS 22 UFS40

UFS22

50% - 15 sec.

UFS15 UFS22

UFS110

UFS40

UFS40

2 x UFS110

UFS110

UFS110

3 x UFS110

2 x UFS110

2 x

UFS110

5.1 Standard braking resistances (SCS KIT)

Since many applications require a working cycle with a braking time shorter than 2s and a pause time at least of 40s (E.D. =5%), braking units UFSxx are provided with standard resistors that, if used according to the following directions, allow to dissipate the energy coming from the motor.

Unit SCS kit

UFS15 RUFC15

UFS22 RUFC22

UFS40 RUFC40

1 pz. x 40

1200W

1 pz x 24

2000W

2 pz. x 6,8

2000W

UFS110 RUFC110

4 pz. x 6,8

2000W

Connection

Overall

Resistance

Overall power continuous duty S1

40

-0%+10%

24

-0%+10%

13,6

-0%+10%

1,2 kW

2 kW

4 kW

Overall power intermittent duty

S3 %ED 5%

(Max 2s cont.)

14kW

25kW

41kW

Dimensions

1 pc

L/W/H.

310/100/75

365/100/75

365/100/75

6,8

-0%+10%

8 kW 82kW 365/100/75

NOTE: The UFSxx units can tolerate working cycles harder the the one described for the SCS kit.

Thus, if necessary, it can use the braking units with resistors different from those given in the

SCS kit. When using other resistor values, NEVER use ohm values lower than those stated at the paragraph 4.2 , since this can damage the unit.

NT348E05 Date 13/12/01 Page 13 of 21

S.C.S. Static Control Systems

6. BOARD THERMAL DIMENSIONING

At the end of the braking stage, the RF resistor can reach even very high surface temperatures

(max. 450°C). Place them in danger-free areas and far from products which could be interested in the heat flow. The energy absorbed by the resistor is the following one:

E = Pmax*t E = in Joule Pmax = in watt t = in seconds

Remember that 1K calory is equal to 4187 Joules, or 1,16*10E-3KW/h (1KW = 860Kcal), and these latter are to be considered for the heat disposal and the dimensioning of the ventilation in the electrical board. One can consider a mean power in function of the processing cycle that, in the worst case, is equal to the maximum P power of the resistor stated in the table, for the RF standard version.

The necessary ventilation, considered in the board thermal exchange, is given by:

Q

=

P

* 50

T

°

Q = cubic meters/hour P = power in KW,

T° = environment/board thermal drop (generally 3

÷

5°C).

NT348E05 Date 13/12/01 Page 14 of 21

S.C.S. Static Control Systems

7. VARIANTS AND CONFIGURATIONS

7.1 Technical features of the UFSxxJ version

The “J” version is identical to the previous one but the standard level threshold is 375V.

It is suitable for mains voltages 200

÷

240V

±

10%. See par. 7.6, 7.7

Power supply voltage 234Vdc

÷

372Vdc

Max. voltage 400Vdc

Unit

UFS15J

UFS22J

UFS40J

Braking voltage

375

375

375

Max, peak current IP (A)

18

34

55

Max. istantaneous power Pmax (KW)

6,7

12,7

20

Ith (A) standard

4

÷

6

7

÷

11

12

÷

18

%ED

10%

10%

10%

RF(

Ω min.

>21

>11

>6.8

)

N.B. The resistors values indicated, are referred to the units setted on the standard threshold voltage (SW-4 = ON.= 375V)

7.2 Max. dissipated power – UFSxxJ version

Dissipated power (unit in stand-by mode) @ 372Vdc: 14W

Dissipated mean power during braking; @375Vdc : I = I max

; d.c. = 10%

UFS15J

18W

UFS22J

22W

UFS40J

28W

7.3 Standard applicative table for UFSxxJ

In the below reported table an indicative coupling is shown, obtained from the motor powers and from the braking torque percentage in comparison to the rated torque. Such a coupling is only indicative, and to be sure that the application of the brake units will not cause problems, it’s necessary to carry out a check on the machine operation, or a precise calculation of the energy which is regenerated during the braking phase.

Motor power

Brake torque

150% - 5 sec

100% - 15 sec.

50% - 15 sec.

NT348E05

5,5 7,5

UFS15J

11 15 18,5 22

UFS22J

UFS15J / UFS22J

UFS15J

UFS40J

UFS22J

UFS2

2J

30

UFS40J

UFS40J

37 45 55

2xUFS40J

2xUFS40J

1UFS40J+

1UFS15J

Date 13/12/01 Page 15 of 21

S.C.S. Static Control Systems

7.4 Starndard brake resistors for UFS xx J

Unit SCS Kit

UFS15J

UFS22J

UFS40J

RUFC

15J

RUFC

22J

RUFC

40J

1 pz. x 24

800W

1 pz x 12

1200W

1 pz. X7.5

2000W

Connection

Total resistance

Total power

S1 continuous service

Total power S3 cyclic service

%ED 5%

(Max 2s continuous)*

Dimensions

1 piece

L/W/H.

0.8kW

6kW 240x100x75

24

-0%+10%

12

-0%+10%

7,5

-0%+10%

1.2 kW

2kW

12kW

19kW

310x100x75

365x100x75

NOTE: When using differents values for resistors, NEVER use ohm values lower than those shown at the paragraph of the technical features, because this can damage the unit.

7.5 Configuration of the UF braking voltage by means of the DIP-SW

The unit is equipped with 8 microswitches, by which it is possible to set a braking value different from the standard one, as indicated in the following table. In the table, to clarify as much as possible, the voltage values for the activationa and deactivation (SLAVE) of the unit are reported.

SW1 UFSxx

1 2 3 4 5 6 7 8 Braking on Braking off

on off off off off off off off off on off off off off off off off off on off off off off off off off off on off off off off off off off off on off off off off off off off off on off off off off off off off off on off off off off off off off off on

778

770

754

745

726

703

690 slave

764

757

740

730

710

690

677 slave

UFSxxJ

Braking on Braking off

390

386

379

375

364

353

347 slave

384

380

371

367

357

346

340 slave

SW1 – 4 (S1) = ON standard position.

Warning! Setting a braking threshold higher than standard (745V/375V), it’s necessary to change the homic and power values of the braking resistors in order to prevent any damage to the resistors and to the braking units..

NT348E05 Date 13/12/01 Page 16 of 21

S.C.S. Static Control Systems

7.6 Suggested settings for standard mains voltages (dip-switch SW1)

Supply mains

+/-10%

200

210

220

230

235

240

380

400

415

420

440

460

480

BUS DC with mains +10%

311

326

342

357

365

373

591

622

645

653

684

715

746

Standard brake voltage

Vbr

347

353

375

375

386

390

745

745

745

745

745

754

778

UFSxxJ

UFSxx

Dip switch

SW1 standard

Position = ON

7

6

4

4

2

1

4

4

4

4

4

2

1

Dip switch

SW1

Position Min

7

6

5

4

3

2

4

4

6

5

2

7

7

Dip switch

SW1

Position Max

5

4

3

2

2

1

4

4

3

3

3

2

1

Note:

Standard position as from delivery ex works

7.7 Min. brake resistance values with SW1 in various positions

SW1-

Position

1

4

5

2

3

6

Vbr UFS15 UFS22 UFS40 UFS110

UFSxx Ipk =

18A

Ipk =

34A

Ipk =

55A

Ipk =

140A

RF braking min. value (ohm)

778

770

754

745

726

703

43.2

42.7

41.8

41.4

40.3

39.0

22.9

22.6

22.2

21.9

21.3

20.7

7

8

690 x

38.3

x

20.3

x

Ipk max. peak current (A)

Vbr rated intervention voltage (Vdc)

RF min. total resistance (Ohm)

14.1

14.0

13.7

13.5

13.2

12.8

12.5

x

5.55

5.5

5.38

5.32

5.18

5.02

4.93

x

386

379

375

364

353

347 x

Vbr UFS15J UFS22J UFS40J

UFSxxJ Ipk =

18A

Ipk =

34A

Ipk =

55A

390

RF braking min. value

(ohm)

21.7

11.5

7.1

21.4

21.1

20.8

20.2

19.6

19.3

x

11.3

11.1

11.0

10.7

10.4

10.2

x

7.0

6.9

6.8

6.6

6.4

6.3

x

NT348E05 Date 13/12/01 Page 17 of 21

S.C.S. Static Control Systems

Note: The min. RF values indicated in the table are given for SW1 positions (S1), considering the

Ipk max. peak current, and brake voltage Vbr indicated in tables of the par. 7.6, and 7.7

according to the formula

RF

min

=

Vbr

Ipk

For SW1 = ON = 4 , Vbr = 778V

RF

min

=

778

18

=

43 , 2

ohm

Rf = 43 ohm

8. CONNECTION TO MORE BRAKING UNITS ON AN INVERTER

In case the power of a single braking unit should not be sufficient any longer for the foreseen application, it is possible to connect more braking units to the same BUS-DC.

To do this it’s necessary to use one standard UFS, which operates as MASTER unit, and other

UFS units, configured as SLAVE units.

The only operation that is necessary to carry out on the standard UFS units, in order to configure

Them in the SLAVE mode, is that of deactivate the autonomous braking (turn the switch N°8 of

the Dip-Switch SW1 to the “ON” position).

The UFS units are provided with two output terminals, to propagate the brake command to other

UFS units, and with two input terminals which accept command coming from the MASTER unit or from a SLAVE unit preceding it. Please see the connection diagram hereafter reported. The brake command is delayed for about 30uS, and remains active for approx. 450uS when command is over.

This allows to attenuate the switching disturb which would occur when switching contemporarily all the UFS units connected to the same BUS-DC, and it’s a negligible time lag considering the normal operating cycle of the drive.

The max. number of UFS that can be connected in this way is 5 (1 MASTER and 4 Slave).

It’s possible also to connect different UFS sizes (i.e.: 1 UFS110 and 1 UFS40), provided that each unit is connected to the brake resistor which is suitable for that size, using for example the kit supplied by SCS. The UFS units are not protected against short-circuits and therefore if a resistor is not properly connected, this can seriously damage the unit and the inverter.

8.1 Connections of more units in synchronism (master/slave). Application notes

When more interlocked master/slave units are used, the P,N, connections must be all branched from the same source, P (+), N (-)) inverter terminals or BUS-DC with cables having the same length, and braided each other in pairs. The connections of the respective resistances must be independent.

The best connection is obtained with all units mounted one close to the other (horizontal pairing side by side).

The vertical assembly (piling up in columns) is unfavourable, and usually it causes problems due

NT348E05 Date 13/12/01 Page 18 of 21

S.C.S. Static Control Systems to noises, that can lead to an irregular unit operation, because of EMC harmful couplings on the synchronism cables.

The cable that transmits the synchronism command from the "master" unit (M5-1 and M5-2 terminals) to the "slave" unit (M4-1 and M4-2 terminals) and to the subsequent one, is a signal connection that can be sensitive to the EMC noises.

The connection must be made with a braided pair of very short cables (max 0,3 meters) having a section of 0,25 …0,5 mm^2 (AWG24….20); It is peremptorily necessary to avoid any coupling with other cables that are a source of EMC troubles (power cables, mains cables, connections to

EMC filters, motor-cables, P, N, connections, connections to the brake resistor, and so on).

One connection of the synchronism cable raised from the plate, without any passage in the cable-duct is usually an effective protection against the EMC noises.

R1 R2 Rn

UF-1

Master

P/N M5

2

Inverter

P / N L1..L3

EMC

Filter

3

UF-2

Slave

P/N M5 M4

1

UF-n

Slave

P/N M4

1

Wrong connections.

Harmful EMC couplings

2 Accidental PE connections

3 Long M/S synchronism connections

NT348E05 Date 13/12/01 Page 19 of 21

M5

UF1

PE P/N

1

M4 M5

UF2

PE P/N

S.C.S. Static Control Systems

M4

UFn

PE P/N

R1 R2 Rn

Power

Supply

Inverter

P/N PE L1.L3

EMC

Filter

2

Common PE

3

UF1 Master

UF2 Slave

Ufn Slave

1

Correct connections

Separated and short signal cables

2 Star-shaped PE connections

3 Separated and independent cable paths

NT348E05 Date 13/12/01 Page 20 of 21

S.C.S. Static Control Systems

Common PE

PE Motor

PE1

PE2

PEn

PE

INVERTER

P N

M

PE Motor

TWISTED

MAX 3m

RUFC

TWISTED

MAX 3m

RUFC

TWISTED

MAX 3m

RUFC

to alarm series

INA

INB

P N

M4-1

M4-2

P1 F

M5-1

M5-2

OUTA

OUTB

SW1-8=off

(default)

MASTER

TWISTED

Max 0.3m

0,25…0.5mm^2

PE1

INA

INB

3 5

P

N

M4-1

M4-2

P1 F

M5-1

M5-2

OUTA

OUTB

SW1-8=on

SLAVE 1

TWISTED

Max 0.3m

0,25…0,5mm^2

INA

INB

PE2

3 5

P N

M4-1

M4-2

P1 F

M5-1

M5-2

OUTA

OUTB

SW1-8=on

SLAVE n

3 5

PEn

Fig. 8.1 UFS connections under MASTER/SLAVE configuration

NT348E05 Date 13/12/01 Page 21 of 21

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