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Index

NEBB SF7 Replacement 400Vac Sensing

Connection Diagram


Connection Diagram

Modification SF7 Special


Connection Diagram


Connection Diagram

NEBB SF7 Replacement Special

0-20mA Connection Diagram

0-10Vdc Connection Diagram

Commissioning information

Manual

MTR

NEBB SF7 Replacement - 22090511

Basic connection diagram

13-05-2009

V1.0

ENG

DATE

VERSION

1/3PAGE

o:\werkplaats\cd_avr_generator\nebb brown boveri\sf7\retrofit_3tx20_sf7\nebb_sf7_replacement_v1.1.vsd

S T + -X2

X1

W UV

+- +- +-

1K9.1 1K9.2 1K9.3

A1

A2

1K9

LH1LH2

A1

A21K10

1K10.1

1

2

3

13

14

15

16

9

10

26

27

28

17

18

19

20

11

12

1S8.1

1S8.1

21

22

23

24

UV

W

NEBB

R S T

(Clockwise rotation)

k

k

l

k

l

k

l

Pot

0

110

230

440l

600V

m3

m1

600V / 200V

m2

m5

600V / 230V

10K

230V SENSING

3TX20

* The use of external voltage setting is optional. (See manual)

*

Modification 3TX20_SF7_Special M/V Sandpiper

21-10-2009 Modification_3TX20_SF7_Special.doc

Author: MTR Confidential Information page 1 of 8 EMRI Electronics EDE

http://www.emri.nl This document is confidential and proprietary to EMRI Electronics. The recipient agrees not to copy, disclose, distribute or disseminate any of the documents and/or information contained herein to any person or entity except as EMRI Electronics approves in writing.

Problem The power supply voltage is too high. When the mechanic from EMRI measured the LH1-LH2 voltage it was 265Vac. The power supply for the AVR is designed for 230Vac with a maximum exceeding of 10%. Also the

high voltage damages the voltage transformer. When the AVR’s where examined by EMRI the 3TX20 were all ok. But the high voltage has broken the voltage transformer which also caused the defect fuses in the power

supply.

Solution Remove the voltage transformer on the EMRI AVR and re-wiring the EMRI AVR and the 600:250Vac voltage

transformer that is attached to the generator.

Figure 1, EMRI AVR Figure 2, Generator

Make sure that the generator and the AVR are switched OFF before working on the generator!





Step 1:

Locate the 600:250Vac transformer on the generator.

Figure 3, Voltage transformer on generator

Step 2:

Remove the 250Vac cable from the transformer and connect it to the 200Vac output from the transformer.

Figure 4, 600:250Vac Voltage transformer Figure 5, 600:200Vac Voltage transformer





Step 3: Locate the voltage transformer on the AVR

Figure 6, Voltage transformer on AVR

Step 4:

Remove the wiring from connection 6 and 8 and cut off the contact.

Figure 7, Wiring from connection 6 & 8





Step 5: Strip the wires in equal length and twist them together

Figure 8, Stripped wiring Figure 9, Twisted wiring

Step 6:

Put a cable-end on the twisted wires and shrink it.

Figure 10, Cable-end on the twisted wires





Step 7: Disconnect all connections from the voltage transformer

Figure 11, Remove all connections

Step 8: Unfasten the M8 bolt on the bottom side and remove the voltage transformer and the cooling for the rectifiers.

Figure 12, Bolt voltage transformer





Figure 13, Remove the cooling for the rectifiers Figure 14, Remove the voltage transformer

Step 9:

Mark the drill holes for the connector and drill 2.5mm holes. (Drill the holes at the same level as the drill hole for the voltage transformer).

Figure 15, Mark the drill holes Figure 16, Drill 2.5mm hole and tap it for M3 bolts





Step 10: Tap M3 and fasten the connector with the M3x20 bolts

Figure 17, Fasten the connector with the M3x20 bolts

Step 11:

Attach the wiring to the connector and bind it up with cable binders (Connect the two brown wires to connection 1 and the two blue wires to connection 4).

Figure 18, Bind up cables





Step 12: Replace the large M8 bolt by the small M8 bolt and fasten the cooling for the rectifiers

Figure 19, M8x25 Bolt

Final result

Figure 20, Final result

MTR

NEBB SF7 Replacement - 22090309


13-05-2009

V1.0

ENG

DATE

VERSION

1/3PAGE


S T + -X2

X1

W UV

+- +- +-

1K9.1 1K9.2 1K9.3

A1

A2

1K9

LH1LH2

A1

A21K10

UV

W

NEBB

R S T


l

k

1

2

1K10.1

1

2

3

13

14

15

16

9

10

26

27

28

17

18

19

20

11

12

1S8.1

1 2 3 4

6 7 8

L

K

M3

1S8.1

21

22

23

24

56R

0

110

230

440

T5

6600V / 380V

T2T6

6600V / 220V 220V / 150-185V

6600V

3TX20

MWA

NEBB SF7 Replacement - 10.5KV


22-03-2010

V1.0

ENG

DATE

VERSION

1PAGE


S T + -X2

X1

W UV

+- +- +-

1K9.1 1K9.2 1K9.3

A1

A2

1K9

LH1LH2

A1

A21K10

1

2

3

13

14

15

16

9

10

26

27

28

17

18

19

20

1S8.1

21

22

23

24

UV

W

NEBB

R S T(Clockwise rotation)

k

k

l

k

l

k

l0

110

230

440l

10.5KV/xxHz

T3

T1

10K

3TX20

* The use of external voltage setting is optional. (See manual)

*

11

12

m4

**

** Optional m4 for generators with Igen>3000 A

1S8.1

+-

1K10

29

30

1S8.1

- +

xxxV:230V

Voltage : 480V/60Hz

Underspeed : 55Hz

R15

T6

T5

53 54

43 44

13 14

F4

T2

14 15 40 37 38 39 33 34 35 29 30 31 32

63

31 32

64

A1 A2

E1 E2

21 22

T2 = 220V:190V

T6 = 10500V:220V

22

21

2 4 6

1 3 5

F3

F1

F2

K3

NEBB SF7 Replacement Special

MTR

NEBB SF7 Replacement

Connection diagram for 0-20mA setpoint adjustment

13-05-2009

V1.0

ENG

DATE

VERSION

2/3PAGE

n:\archief\orders 2009\emri electronics\22090309 (myren - sf7 replacement)\wiring diagram\nebb_sf7_replacement.vsd

3TX20S T + -X2

X1

W U V

+- +- +-

1K9.1 1K9.2 1K9.3

A1

A2

1K9

LH1LH2

A1

A21K10

UV

W

NEBB

R S T


l

k

1

2

1K10.1

1

2

3

13

14

15

16

9

10

26

27

28

17

18

19

20

11

12

* 1S8.1 - De-excitation switch (optional)

1S8.1

1 2 3 4

6 7 8

** Interlocking C.B.

+

-

0-20mA

L

K

T3

1S8.1*21

22

23

24

**

**

**

**

56R

MTR

NEBB SF7 Replacement

Connection diagram for 0-10V setpoint adjustment

13-05-2009

V1.0

ENG

DATE

VERSION

3/3PAGE

n:\archief\orders 2009\emri electronics\22090309 (myren - sf7 replacement)\wiring diagram\nebb_sf7_replacement.vsd

1S8.1

3TX20S T + -X2

X1

W U V

+- +- +-

1K9.1 1K9.2 1K9.3

A1

A2

1K9

LH1LH2

A1

A21K10

UV

W

NEBB

R S T


l

k

1

2

1K10.1

*

1

2

3

13

14

15

16

9

10

26

27

28

21

22

17

18

19

20

11

12

* 1S8.1 - De-excitation switch (optional)

1S8.1

1 2 3 4

6 7 8

** Interlocking C.B.

23

24

**

**

470R+

-

0-10Vdc

L

K

T3

**

**

56R

Commissioning Information

NEBB SF7 Replacement AVR Commissioning information

20-1-2010 Commissioning information 3TX20 SF7 Rettrofit_V1.0.doc

Author: PLO page 1 of 2 EMRI Electronics bv

http://www.emri.nl

This document is confidential and proprietary to EMRI Electronics. The recipient agrees not to copy, disclose, distribute or disseminate any of the documents and/or information contained herein to any person or entity except as EMRI Electronics approves in writing.

The EMRI 3TX20 SF7 replacement avr meet the specification for the NEBB WAB generators. There are some facts to pay additional attention to: DROOPKIT: A Droopkit for parallel operation must placed. This CT is placed in another phase compared to the genuine CT which is in de middle phase. Please note that correct phase direction and CT direction do matter for parallel operation. The genuine CT must be shortened or removed. See diagram. SELF EXCITATION /BUILD UP: Depending upon the generators operating voltage, size, speed, residual voltage and amplification, build up may be trouble free or troublesome. When problems during build up, pay attention to the next items: The avr has an underspeed setting, which may limit the building up due to the fact the the avr always starts from the underspeed state. Turning the potentiometer slightly and slowly clockwise may help to accelerate the build up. The LED should go off.

The avr (3TX20) has a build in self excitation circuit, which stops building up at a voltage derivated from the terminals LH1 and LH2, and the voltage selector setting. If the build up stops too soon or fluctuates at a lower level, the voltage selector can be set from 230V to 110V. Please note that the voltage at the terminals LH1 and LH2 never exceed the maximum voltage mentioned in the manual.

NEBB SF7 Replacement AVR Commissioning information

20-1-2010 Commissioning information 3TX20 SF7 Rettrofit_V1.0.doc

Author: PLO page 2 of 2 EMRI Electronics bv

http://www.emri.nl

This document is confidential and proprietary to EMRI Electronics. The recipient agrees not to copy, disclose, distribute or disseminate any of the documents and/or information contained herein to any person or entity except as EMRI Electronics approves in writing.

Since some generators do build up from the residual state very difficult, an additional relay contact has been integrated for building up. However this relay is intended to work positive to the build up sequence, it can also work negative depending upon the machines properties. When the avr starts, it is in underspeed state. When the building up of the voltage goes rather fast, the actual generator voltage exceeds the setpoint for underspeed, causing the avr�s output to decrease, and make the generator voltage instable / pending. Putting the additional relay contact out of function may help.

This can be done to move the shown wire to a not used terminal at the relay.

Manual

- Manual

Jan ‘08

3TX20 V2.0

Generator rewinding & repair. Voltage regulator products 3TX20_V2.0_JAN08.doc

Version : 16-1-2008 Page 2 of 18

READ THE MANUAL PRIOR BEFORE COMMISSIONING

Application, use or commissioning can only take place by acceptance of the general deliveries conditions of EMRI bv which are available upon request.

Check WWW.EMRI.NL for latest manual / updates / modifications or general installation information.

INTRODUCTION

This manual provides information for use and application of the product.

This information consists of - Warnings - Layout - Absolute maximum ratings - Commissioning information - Dipswitch and potentiometer settings - Layout terminals - General installation information and environmental aspects Application Diagrams

The manual does not cover all technical details of the product. Also may specifications being modified by the manufacturer without notice. For further information, the manufacturer should be contacted.

ELECTRICAL DANGER ELECTRICAL DANGER

LIVE VOLTAGE LIVE VOLTAGE

WARNING

To avoid personal injury or equipment damage: Mounting, connecting and commissioning, should be

performed by electrical qualified personal only.

Due to liability reasons, EMRI products may not be used, applied or commissioned in equipment residing under law of the United States of America or Canada. Neither may

EMRI products be applied or commissioned by any person residing under law of the United States of America

or Canada.

WARNING

Never work on a LIVE generator.



Introduction

This manual provides information for use and application of the EMRI 3TX20.

This information consists of

- AVR Layout - Absolute maximum ratings - Commissioning information - Dipswitch and potentiometer settings - Layout terminals - General installation information and environmental aspects - Application Diagrams

The manual does not cover all technical details of the product. Also specifications may be modified by the manufacturer without notice. For further information, the manufacturer should be contacted.

WARNING

To avoid personal injury or equipment damage: Mounting, connecting and commissioning, should be performed by electrical trained and qualified personal

only.

ELECTRICAL HAZARDOUS VOLTAGES DANGEROUS

DO NOT OPERATE WHEN NOT FAMILIAR WITH GENERATORS

WARNING

Never work on a LIVE generator. Unless there is another person present who can switch of

the power supply or stop the engine



AVR Layout

UVWX1X2ST

DIP1LED

3TX20

D FIPV Vfine

LH1 + - LH2

0

110

230

400

OP

TIO

N C

ON

NE

CT

OR

Supply voltage selector linkLH1 - LH2

THE AVR IS PROTECTED FROM THE ENVIRONMENT BY AN EPOXY COATING

DIMENSIONS : L X W X H

160 X 145 X 110 MM WEIGHT: 1850 GR.



Absolute maximum ratings / Specifications

SYMBOL PARAMETER CONDITION MIN. MAX. UNIT

UU, UV, UW Voltage sensing input < 30 s. - 500 VAC

Accuracy Voltage 1 %

Ix1, Ix2 Droop input 0,75 AAC

I+, I- AVR field current Forced < 0.5 sec.

20 40

ADC

LH1-LH2 110230400

Supply input 30*1

55*1

115*1

50 / 60 115/140230/260440/480

Hertz V

Rfield Field resistance Supply 110 V Supply 230 V Supply 400 V

2.5515

--

Vse *1 Self excitation (S.E.) > 5 V 3 10 V!

TAMB Operating ambient temperature

non condensing 0 +50 "C

TSTG Storage temperature non condensing -45 +150 "C

*1 depending upon self excitation behaviour of the generator

Supply Voltage selection link

Dependent upon self excitation bevaviour of the generator Safe operating area

115V115V

440V480V

50Hertz60Hertz

MAX

330V330V

Link 440Volt *2

55V55V

230V260V

50Hertz60Hertz

175V175V

Link 230Volt

30V30V

90V 115V140V

50Hertz60Hertz

90V90V

Link 110Volt

Select the supply voltage range so that MAX. value will never be exceeded *2 Use this high voltage input only upon low current and/or higher voltage exciter value’s

ask the manufacturer when in doubt



Commissioning information

The unit should be installed with respect to the environmental specifications as well as the rules mentioned in the General installation information. Dipswitch settings may not be altered when operating but need to be set beforehand. For safety reasons the voltage-LEVEL potentiometer is best turned completely counter clockwise, to start at the lowest possible voltage. Potentiometers P and I should be turned to centre position. As a reference the chart below shows generator voltages for different configurations. The option connector should be occupied with the supplied dummy connector, containing some essential inter connections.

Dipswitch and potentiometer settings

Carefully determine the correct way of connecting the AVR from the suitable application diagram. Incorrect installation could lead to hazardous situations and damage to generator and AVR.When dipswitch 2 is set to 230V sensing (on), the AVR expects 200 – 325V at it’s inputs. When dipswitch 3 is set to 280V sensing (on), the AVR expects 225 – 375V at it’s inputs. When dipswitch 2 and 3 are not set ,the AVR expects 280 – 480V at it’s inputs.

When dipswitch 1 is set, the self excitation circuit is activated, and the generator excites with residual voltage *1

DIPSWITCH

1 2 3 4 5 6 7 8

ON SELF. EXCITED

230V SENSING RANGE

280V SENSING RANGE

PHASE LOSS

ENABLED

S & T SHORTENED

NOT USED

NOT USED

UNDERSPEED. PROTECTION

ENABLED

OFF NOT SELF

EXCITED

PHASE LOSS

DISABLED

S & T OPEN

UNDERSPEED. PROTECTION DISENABLED

POTENTIOMETER FUNCTION

V COURSE GENERATOR VOLTAGE ADJUSTMENT

V FINE GENERATOR VOLTAGE ADJUSTMENT

P-STABILITY PROPORTIONAL GAIN ADJUSTMENT

I-STABILITY PROPORTIONAL GAIN ADJUSTMENT

F-UNDERSPEED UNDERSPEED TRIP LEVEL SEE NOTE

DROOP VOLTAGE DROOP (PARALLEL OPERATION)

Note: Too low setting F-Underspeed or disabling Underspeed protection may cause damage to the generator or the AVR due to incorrect voltage / frequency ratio.

DO NOT CHANGE DIPSWITCH

SETTINGS DURING OPERATION



Layout terminals

TERMINAL CONNECTIONS

U,V,W THREE PHASE SENSING

X1,X2 DROOP CT CONNECTIONS (PARALLEL OPERATION)

S,T EXTERNAL VOLTAGE SETTING POTENTIOMETER

LH1,LH2 SUPPLY VOLTAGE FOR AVR

0,110,230,400 SUPPLY VOLTAGE SELECTOR

+,- EXCITER FIELD CONNECTION

Fuse

20 A 20 AT, 500 V, 10.3 X 38.1 MM

Factory Settings Dipswitches

DIPSWITCH

1 2 3 4 5 6 7 8

ON SELF. EXCITED

S & T SHORTENED

NOT USED

NOT USED

UNDERSPEED. PROTECTION

ENABLED

OFF OFF OFF

PHASE LOSS

DISABLED



General installation information

Absolute Maximum Ratings

- The Absolute Maximum Ratings are those limits for the device that, if exceeded, will likely damage the device. Exceeding the absolute maximum ratings voids any warranty and/or guarantee.

Mounting - Mounting of the product should be done in such a way that the absolute maximum

ambient temperature rating of the product will never be exceeded. - Mounting of the product should be done in such a way that maximum cooling

(direction of cooling ribs and direction of airflow) is achieved. - Mounting of the product should be done in such a way that no humid air can flow

through the product or condensation occurs. - Mounting of the product should be done in such a way that dust or other materials or

residue will not remain in or on the product. - Mounting of the product should be done in such a way that the maximum vibration is

not exceeded. - Mounting of the product should be done in such a way that personal contact with

persons is impossible.

Wiring - Diameter size of the wiring should be enough to carry the expected current. Wire

insulation should be enough to withstand the expected operating voltages and temperatures.

- To improve EMC emission and immunity, care should be taken for the lay out of the wiring. This in respect to all wiring in the installation.

- Keep current carrying wires as short as possible. - Keep wires carrying a total sum of zero Ampere close to each other, or in one single

cable. E.g. U, V, W or + and -, or Phase and neutral, X1 and X2. - Avoid current carrying conductors next to sensing or control wiring. Especially current

controlled by SCR’s or PWM controlled transistors. - If sensitive sensing signal cables need to be laid across distance along other cabling,

shielded cable is preferred. Keep the shield as long as possible and the wiring outside the shield as short as possible. Do not solder or shrink the shield to a regular wire. Connect the original shield to ground with a as large as possible contact surface.



Additional installation information

- When the product is supplied by means of a transformer, it should never be an auto-transformer. Auto-transformers react as voltage sweep up coil and may cause high voltage peaks.

- Standard fit capacitors or over-voltage suppressers across F+ and F- or exciter field terminals inside the generator should be removed.

- When the product is supplied by means of a transformer, it should be able to carry at least the maximum expected current. Advisable is, to have a transformer which can carry twice the maximum expected current. Inductive loads make voltage sacks and peeks into the secondary voltage of a transformer, from which the device may malfunction.

- It is not recommended to apply switches in dc outputs. It is preferred to use switches in the ac supply inputs of devices. In case it is unavoidable to have switches in the dc output of a device, action must be taken to avoid over voltage damage to the device due to contact arcing. Use a voltage suppressor across the output.

- It is not recommended to apply switches or fuses in the sensing lines. Defects can cause high voltage situations due to over-excitation.

- When using a step down transformer in medium or high voltage generators, the transformer should be three phase (if three phase sensing), and the transformer should be suitable for acting as a sensing transformer. If the transformer is unloaded, connect a resistor to avoid voltage waveform distortion.

- The phase relation from the generator to the AVR is important. Also when voltage transformers and/ or current transformers are installed.

- When using a step down or insulation transformer in the droop circuit, phase relation from the generator to the AVR is important.

- CT’s wiring, connected to the AVR should never be grounded. - Always disconnect electronic products, circuits and people before checking the

insulation resistance (Megger check). - Due to differences in generators impedance’s, EMC behaviour is not predictable.

Therefore the commissioner / installer should be aware of proper and correct installation.

- Large, highly inductive, exciter stator windings can cause destructive high voltage peaks. Adding a resistor from 10 to 20 times the exciter stator fieldresistance reduces voltage spikes. If necessary, a RC filter can be fitted additionally

- Upon problems during commissioning, faulty behaviour or defects in the generator, consult the fault finding manual at our web site

- Some advises may be overdone or seem extraordinary, but since the electrical rules are the same everywhere, these advises are given.


Version : 16-1-2008 Page 10 of 18

Application Diagram 230 Volt Supply

10K

P1S1

FIE

LD

RO

TO

RS

TA

TO

R

GENERATOR OUTPUT, ROTATIONCLOCKWISE

U V WN

DR

OO

PK

ITU V W X1 X2 S T

DIP1LED

3TX20

D F I P VV fine

LH1+-LH2

0

110

230

400

OP

TIO

N C

ON

NE

CT

OR


Version : 16-1-2008 Page 11 of 18

Application Diagram Caterpillar 400-450 Volt


Version : 16-1-2008 Page 12 of 18

Application Diagram Insulation Transformer

10K

P1S1

FIE

LD

RO

TO

RS

TA

TO

R


U V W

DR

OO

PK

IT

U V W X1 X2 S T

DIP1LED

3TX20

D F I P VV fine

LH1+-LH2

0

110

230

400

OP

TIO

N C

ON

NE

CT

OR

Step down transformer400 /230 Volt


Version : 16-1-2008 Page 13 of 18

Application Diagram Nishishiba

P1 S1

FIE

LD

EX

CIT

ER

GE

NE

RA

TO

RS

TA

TO

R


U V W

KJ

UVWX1X2ST

DIP1LED

3TX20

D F I P V V fine

LH1 + - LH2

0

110

230

400

OP

TIO

N C

ON

NE

CTO

R

450Volt 230 V

1000 VA

NISHISHIBA GENSET1063 kVA, 440 Volt, 1395 Amp, exc. < 10 Ampproposal if droop circuit cannot be implemented

Droopkit 1500

CT CT

AUX PT

4.8 Amp

SKB25/12


Version : 16-1-2008 Page 14 of 18

Application Diagram NEBB STROMBERG SMUX2R

P1

S1

FIE

LD

RO

TO

RS

TA

TO

R


U V WD

RO

OP

KIT

10K

U V W X1 X2 S T

DIP1LED

3TX20

D F I P V V fine

LH1+-LH2

0

110

23

0

40

0O

PT

ION

CO

NN

EC

TO

R

B1

The numbers refer to the SMUX connector pin number1)Isolate the wires 7 and 8 from the original CT and connect them to new DROOPKIT. Shortenold CT !!2)Shorten the input from the rectifier from the compound transformers system, and isolate wire 10, and bring it only to the + (I) of the exciter field and to the + from the AVR3)Connect other wiring as indicated

SMUX 2R Replacement by 3TX20

S1ShortenOriginal CT

2

3

4

(Previous used 7 & 8)

ShortenCt’s

I K 12

(Wire 10 , Isolated from rectifier)

Isolate wire 10 and use for I

6


Version : 16-1-2008 Page 15 of 18

Application Diagram NEBB STROMBERG SMUX3R1

P1

S1

FIE

LD

RO

TO

RS

TA

TO

R


U V WD

RO

OP

KIT

10K

U V W X1 X2 S T

DIP1LED

3TX20

D F I P V V fine

LH1+-LH2

0

11

0

23

0

40

0O

PT

ION

CO

NN

EC

TO

RB1

SMUX 3R1 Replacement by 3TX20

S1ShortenOriginal CT

1

2

3

(Previous used 8 & 9)

I K

6

4

+

-

New wire

Previous SMUX 3R1

terminal numbers


Version : 16-1-2008 Page 16 of 18

Application Diagram Daihatsu Mitsubishi

P1 S1

FIE

LD

EX

CIT

ER

GE

NE

RA

TO

RS

TA

TO

R


U V W

KJCTJ 2 Ohm

8 Ohm

UVWX1X2ST

DIP1LED

3TX20

D F I P V V fine

LH1 + - LH2

0

110

230

400

OP

TIO

N C

ON

NE

CT

OR

6 Ohm/300Watt

450Volt 230 /110 Volt

1500 VA

DAIHATSU / MITSHIBISHI GENSET1000 kVA, 450 Volt, 1283 Amp, exc. 55 Volt, 7 AmpExciter generator 25 kVA (3 x 100 V)

Droopkit 1500

Optional


Version : 16-1-2008 Page 17 of 18

Application Diagram NEBB SF7

P1

S1

FIE

LD

RO

TO

RS

TA

TO

R


U V WD

RO

OP

KIT

10K

U V W X1 X2 S T

DIP1LED

3TX20

D F I P V V fine

LH1+-LH2

0

110

230

400

OP

TIO

N C

ON

NE

CT

OR

C2

C1

M3

M2N2&3

N5

B1

U2

Y U1

R10

C1 AND C2 MUST BE ENERGIZED ON > 40 % OF Unominal, AND DE-ENERGIZED WHEN < 40 % OF Unominal

M1

NEBB SF7 REPLACEMENT WITH / 3TX20 / OR LX10 / OR 3FLASR11


Version : 16-1-2008 Page 18 of 18

Application Diagram > 480 Volt

10K

P1S1

FIE

LD

RO

TO

RS

TA

TO

R


U V W

DR

OO

PK

IT

U V W X1 X2 S T

DIP1LED

3TX20

D F I P VV fine

LH1+-LH2

0

110

230

400

OP

TIO

N C

ON

NE

CT

OR

Step down transformerVgen / 230- 115 Volt

V gen > 480 Volt 60 Hertz

Measuring step down transformer

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