EMRI LX4 Instruction Manual

LX4

Voltage regulator for generators

Instruction Manual V3.1.1

Product version V3.1

Manual V3.1.1 Page 2 of 36

Warnings

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

WARNING

The system should not be installed, operated, serviced or
modified except by qualified personnel who understand
the danger of electric shock hazards and have read and
understood the user instructions

.

ELECTRICAL HAZARDOUS VOLTAGES
DANGEROUS DO NOT OPERATE WHEN
NOT FAMILIAR WITH GENERATORS

WARNING

Dangerous voltages are present at the voltage regulator
board. Accidental contact with live conductors could result
in serious electrical shock or electrocution.
Disconnect the power source before making repairs,
connecting test instruments, or removing or making
connections to the voltage regulator or generator.

WARNING

Never work on a LIVE generator. Unless there is another
person present who can switch off the power supply or
stop the engine

WARNING

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.

Manual V3.1.1 Page 3 of 36

Table of contents

Part 1/2

1. Introduction

1.0 General description 5

1.1 AVR Layout 5

1.2 Absolute maximum ratings 6

1.3 Commissioning information 6

2. Installation

2.0

Interfaces overview 7

2.1 Adjustments overview 8

2.2 Terminals overview 9

2.3 Electrical characteristics 10

3. Operation and maintenance

3.0 AVR status 11

3.1 Modes of control 11

3.1.0 Idle

11

3.1.1 Build-up

11

3.1.2 Voltage control

12

3.2 Setpoint limiting 13

3.2.0 Introduction

13

3.2.1 Excitation current limiting

14

3.2.2 Generator over temperature limiting

15

3.2.3 Underspeed limiting

16

3.3 Special functions 17

3.3.0 Self Excitation

17

3.4 CAN bus 18

3.4.1 Introduction

18

3.4.2 CAN status LED

18

3.4.3 CAN heartbeat

18

3.4.4 CAN AVR measurements & status

19

3.4.5 CAN control

20

4 Protections and diagnose

4.1 LED error codes 21

4.2 Protections 21

4.2.0

Over excitation protection

22

4.2.1 Generator over temperature protection

23

4.2.2 AVR over temperature protection

24

4.2.3 Phase loss / phase sequence protection

25

4.2.4 Over voltage protection 110%

26

4.2.5 Over voltage protection 125%

27

Manual V3.1.1 Page 4 of 36

Table of contents

Part 2/2

5 Settings and adjustments

5.1 Generator voltage 28

5.2 P & I stability 28

5.3 Underspeed frequency 28

5.4 Dipswitch settings 29

5.5 T.Disable header 30

5.6 SE header 30

5.7 EXT.POT. header 30

5.8 CAN Termination header 30

5.9 Factory settings 31

6 Wiring diagrams

6.1 Wiring diagram single auxiliary supply winding 32

6.2 Wiring diagram double auxiliary supply winding 33

6.3 Wiring diagram transformer supply 34

Appendix

General Installation information 35

Manual V3.1.1 Page 5 of 36

1. INTRODUCTION

1.0 General description

This manual contains instructions for installing, operating and maintaining the LX4
Automatic Voltage Regulator (AVR).

1.1 AVR Layout

The AVR is protected against environmental influences by a PUR coating. Prefabricated links
are provided for T.Disable, EXT.POT and CAN termination

WVUS2S1T1 T2LH1 LH2- +

F

on

dip

1

2 3 4

Status

LED

V P I D

JTAG

Interface

EME RD200.1

Firmware: V1.x

Nr: 1234

Hardware: V1.x

Prod: 0106

Ede NL

CAN Interface

CAN LED

T.Disable

CAN Termination

FUSE

LHGND NC

LH3 LH4

SE

EXT.

POT.

28 23130,00

9,00

115,00

9,00

Fig 1. AVR layout

Max AVR height: 60 mm
Dimensions in mm

Manual V3.1.1 Page 6 of 36

1.2 Absolute maximum ratings

Symbol

Parameter

Condition

Min.

Max.

Unit

U,

V,

W Voltage sensing input

< 30 s.

-

500 VAC

+, -

AVR field current

Continuous

< 10 s.

-

- 3

6 A

DC

ADC

LH1-LH2,

LH3-LH4

Supply input

1 phase connected (dc

-

400Hz)

3 phases connected (dc-400Hz)

20

15

100

100

V

V

R

field

Field resistance

@ 100 V

LH1-2 LH3-4

(rms)

@ 60 V

LH1-2 LH3-4

(rms)

10

6 -

-

Ω
Ω

T

AMB

Operating temperature

95 % RHD non condensing

-20 +70

°C

T

STG

Storage temperature

95 % RHD non condensing

-20 +85

°C

S1,S2

Unused terminals

EXT. POT.

External Volt adjust

- 10 kΩ

FUSE

Fuse rating

Time delay

4 AT

Table 1. Absolute maximum ratings

1.3 Commissioning information

The system should not be installed, operated, serviced or modified except by qualified
personnel who understand the danger of electric shock hazards and have read and
understood the user instructions.

Defects in the generator or AVR may cause consequential loss. Precautions must be taken to
prevent this from occurring.

Never work on a LIVE generator. Unless there is another person present who can switch off
the power supply or stop the prime mover.

Dangerous voltages are present at the voltage regulator board. Accidental contact with live
conductors could result in serious electrical shock or electrocution.
Disconnect the power source before making repairs, connecting test instruments or removing
or making connections to the voltage regulator.

The unit should be installed with respect to the environmental specifications as well as the
rules mentioned in the General installation information.
For safety reasons the Voltage level potentiometer is best turned completely counter
clockwise in order to start at the lowest possible voltage.

Manual V3.1.1 Page 7 of 36

2. INSTALLATION

For a complete wiring diagram refer to chapter 6: Wiring diagrams.

2.0 Interfaces overview

Status

LED

JTAG

Interface

CAN Interface

CAN LED

LHGND NC

Fig 2. Interfaces overview

Symbol

Description

Notes

Status LED AVR control mode & Error diagnostics See Table 6 and 11
CAN LED CAN bus control mode & Error diagnostics See Table 7
CAN Interface.L CAN bus low wire
CAN Interface.H CAN bus high wire
CAN Interface.GND CAN bus ground
CAN Interface.NC Not connected
JTAG Interface Maintenance port

Table 2. Interfaces

Manual V3.1.1 Page 8 of 36

2.1 Adjustments overview

F

on

dip

1

2 3 4

V P I D

Fig 3. Adjustments overview

Symbol

Description

Notes

V Generator voltage setpoint
P Proportional gain setpoint
I Integral time setpoint
D Unused Should be in CCW position
F Underspeed setpoint
Dipswitch 1 Sensing voltage selection Off = 400Vac On = 230V

ac

Dipswitch 2 Phaseloss protection Off = disabled On = enabled
Dipswitch 3 Control mode selection Off = Constant voltage On = VPH
Dipswitch 4 Overexcitation threshold Off = 2A On = 4A

Table 3. Adjustments

DO NOT CHANGE DIPSWITCH
SETTINGS DURING OPERATION

Manual V3.1.1 Page 9 of 36

2.2 Terminals overview

WVUS2S1T1 T2LH1 LH2- +

T.Disable

CAN Termination

LH3 LH4

SE

EXT.

POT.

Fig 4. Terminals overview

Symbol

Description

Notes

U, V, W Voltage sensing input phase sequence U→V→W
S1, S2 Unused terminals
T1, T2 Temperature sensor input KTY84-130, PTC or Clixon sensor
LH1, LH2
LH3, LH4

Supply inputs For self excitation, the auxiliary supply

winding must be connected to LH3-LH4
+, - Field excitation output
SE Self Excitation link

(Caution: High voltage)

Never fit or remove link while generator is in

operation

Shorting SE enables self excitation.
EXT. POT. External voltage adjust input

10

k

Ω potentiometer

T.Disable Disables T1 – T2 sensing Shorting T.Disable disables temperature

protection
CAN Termination CAN bus termination link Shorting enables 120 Ohm bus termination

Table 4. Terminals

Manual V3.1.1 Page 10 of 36

2.3 Electrical characteristics

Symbol

Parameter

Condition

Min.

Max.

Unit

U, V, W

Voltage sensi

ng input

50-60 Hz 20 480 VAC

+, - AVR field current

- 3 ADC

LH1

– LH2,

LH3 – LH4

Supply input

dc -

400 Hertz

20 100

VAC

R

field

Field resistance

10 -

Ω

T

AMB

Operating temperature

95 % RHD non condensing

0

+70

°C

T

STG

Storage temperature

95 % RHD

non condensing

-20 +85

°C

S1 – S2

Unused terminals

EXT. POT.

External Volt adjust

10k

Ω potentiometer

0 10 kΩ

FUSE

Fuse rating

Ceramic,

Time delay

4 AT

Table 5. Electrical characteristics

Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above
those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions
for extended periods may affect device reliability and lifetime.

Manual V3.1.1 Page 11 of 36

3. Operation and maintenance

3.0 AVR Status LED

The AVR’s mode of control is indicated by the status LED. The options are depicted in table 6.

Table 6. AVR status

3.1 Modes of control

3.2.0 Idle

When a supply is connected to the AVR but the generator frequency is below 25Hz, the AVR
enters idle mode. During idle mode field excitation is inhibited however all protections remain
functional.

3.1.1 Build-up

When the generator frequency rises above 25Hz, the AVR enters the build up mode. The
generator voltage is ramped up to the voltage setpoint. When the generator voltage is close to
the desired nominal value, the status led signals continuous green. Diagram 1 shows the
sequence of events.

Diagram 1. Build up

Manual V3.1.1 Page 12 of 36

3.1.2 Voltage control

When dipswitch 3 is in off position, the AVR performs constant voltage control after finishing
the build up mode. The voltage/ frequency characteristic is depicted in diagram 2.

Below the underspeed frequency, set by potentiometer F, the generator voltage is controlled
according a Volt per Hertz ramp. Below 25Hz the AVR control mode returns to idle and
excitation is stopped. As a consequence the generator voltage will then drop to the residual
voltage level. For a detailed description of potentiometer F see chapter 5.4.

Diagram 2. Constant Voltage control

When dipswitch 3 is in on position, the AVR performs Volt per Hertz control after finishing the
build up mode. The voltage/ frequency characteristic is depicted in diagram 3.

Diagram 3. Volt per Hertz Control

Manual V3.1.1 Page 13 of 36

3.2 Setpoint limiting

3.2.0 Introduction

The AVR is equipped with both limiting functions and protections.

The limiting functionality lowers the voltage- or excitation setpoint if a certain threshold is
exceeded. When the measured quantity no longer exceeds the threshold, the setpoint is
increased again. This enables the AVR to recover from the situation.

The protections also lower the voltage setpoint, upon exceeding a certain threshold. However
Recovery is only possible by resetting the AVR. This is accomplished by interrupting the AVR
supply (LH1-LH2 and LH3-LH4) for at least 5 seconds. In case an auxiliary supply winding is
used this may be accomplished by stopping the generator.

When a protection is triggered the voltage setpoint is decreased to a fixed level of 95V.
Keep in mind that the actual generator voltage may larger than 95V due to the generator’s
residual magnetism.

For a detailed description of all protections refer to chapter 4.

Manual V3.1.1 Page 14 of 36

3.2.1 Excitation current limiting

When the excitation current level, selected by dipswitch 4, is exceeded for more than 5
second, the AVR controls the excitation current to the selected level.

Excitation current control is visualized by the status LED signalling continuous orange.

When the excitation current decreases below the selected threshold again, for more than 5
second, voltage control is resumed. The AVR ramps back to the voltage setpoint, while
signalling a orange blinking status LED. When the generator voltage is close to the desired
nominal value, the status led becomes continuous green.

Diagrams 5 shows a sequence of events for diagnosis purposes in case of excitation limiting.

Diagram 5. Excitation limiting

Manual V3.1.1 Page 15 of 36

3.2.2 Generator over temperature limiting

The generator temperature may be sensed either by a clixon, PTC or KTY84-130 sensor
connected to terminals T1-T2. The over temperature limiting and protection can be disabled
by omitting the temperature sensor and shorting link T.Disable

If a clixon or PTC is connected no absolute temperature can be measured, only the exceeding
of a threshold. In this case the generator over temperature protection is triggered
simultaneously with the over temperature limiting function. This causes the AVR to decrease
the voltage setpoint to 95V. The generator over temperature protection is described in 4.2.1.

If a KTY84-130 sensor is connected and the generator temperature exceeds 160ºC for more
than 5 seconds, the AVR decreases the voltage level. The voltage level is decreased linear,
inverse proportional to the temperature transgression by 1.5V/ºC.

Active voltage limiting is visualized by the status LED signalling continuous orange.

When the generator temperature decreases, voltage is increased again until the nominal
voltage. When the generator voltage is close to the desired nominal voltage, the status led
becomes continuous green again.

Diagram 6 shows a sequence of events for diagnosis purposes in case of generator over
temperature limiting.

Diagram 6. Over temperature limiting

Manual V3.1.1 Page 16 of 36

3.2.3 Underspeed limiting

The goal of the underspeed limiting is to prevent damage to the generator caused by
overexcitation. When the generator frequency drops below the underspeed setpoint,
F

underspeed

, the generator voltage is decreased linear, proportional to the generator frequency.

The underspeed setpoint is set by potentiometer F, as is described in 5.4.

Active underspeed limiting is visualized by the status LED signalling continuous orange,
however only when the constant voltage control mode is selected (dipswitch 3 = ‘ on’).

In case the generator frequency drops below 25Hz excitation is stopped completely and the
AVR control mode becomes idle. This is visualized by a green blinking status LED.

Diagrams 7 shows a sequence of events for diagnosis purposes in case of underspeed
limiting during constant voltage control.

Diagram 7. VPH underspeed limiting

Manual V3.1.1 Page 17 of 36

3.3 Special functions

3.3.0 Self Excitation

When the AVR supply voltage, connected to LH1-2 and LH3-4, is insufficient to supply the
AVR, self excitation can be used. Self excitation is enabled by shorting the SE terminal.
The self excitation circuit redirects the AVR supply voltage to the generator’s exciter field
uncontrolled, bypassing the internal controller. This field flashing causes the generators flux to
increase, amplifying the supply voltage.
When the supply voltage has increased to a level sufficient to supply the AVR, the self
excitation circuit is disabled again. Hereafter, the AVR’s internal controller builds up the
generator voltage.

Diagram 8 shows a sequence of events with enabled self excitation, for diagnosis purposes.

Caution:

Never fit or remove the SE link when the generator is operation.

This is a live conductor, contact can result in serious electrical shock.

Diagram 8. Self Excitation

Manual V3.1.1 Page 18 of 36

3.4

CAN-bus

3.4.1 Introduction

The AVR is equipped with a CAN bus interface. The CAN interface enables the user to obtain
detailed information about the AVR status, measured quantities and to adjust AVR control
setpoints.

The interface complies with CAN specification 2.0B. The AVR communication operates at a
transfer rate of 250kBit/s and uses standard frame (11-bit) message identifiers.

3.4.2 CAN status LED

The CAN bus status is indicated by the CAN status LED. The options are depicted in table 7.

Table 7. CAN status

3.4.3 CAN heartbeat

The AVR sends a heartbeat signal when the AVR is powered. This signal may be used to
assess the proper functioning of the CAN bus communication.
The heartbeat consists of a message with ID 0x70A and is sent every 500ms. The message
content is 1 byte long and alternating 0x05 or 0x85 .

Heartbeat

ID:0x70A

Byte

Description

Value

Remarks

0 Alternating heartbeat

0x05 ~ 0x85

Table 8. CAN heartbeat

Manual V3.1.1 Page 19 of 36

3.4.4 CAN AVR measurements & status

When the AVR is powered a message containing AVR measurements and the present AVR
status is sent. The message with ID 0x18A is sent every 500ms. The definition of the 8 byte
content is described in table 9

AVR measurements & status

ID:0x18A

Byte

Description

Value

Unit

Remarks

0 Gener

ator voltage

0-

255 V Phase

- Neutral

1 Excitation current ratio

0-

100 % (Byte 5 / Byte 3) * 100%

2 Generator temperature

0-

255 ºC

3 Excitation current

0-

255 0.01A

4 Generator frequency

0-

255 0.5Hz

5 Excitation current setpoint

0-

255 0.01A

6 Statu

s AVR

Bitwise AVR statusregister

bit 0

Generator current limiting

1 - 0 bit 1 = active

bit 1

Excitation current limiting

1 - 0 bit 1 = active

bit 2

Over temperature generator limiting

1 – 0 bit 1 = active

bit 3

Over temperature AVR limiting

1 – 0 bit 1 = active

bit 4

Underspeed limiting

1 – 0 bit 1 = active

bit 5

Overvoltage 440V protection

1 – 0 bit 1 = triggered

bit 6

Overvoltage 500V protection

1 – 0 bit 1 = triggered

bit 7

Phaseloss protection

1 – 0 bit 1 = triggered

7 AVR temperature

0-

255 ºC Measured at MCU

Table 9. CAN measurements & status

Manual V3.1.1 Page 20 of 36

3.4.5 CAN control

When the AVR is powered it is possible to obtain remote control over the AVR voltage setpoint
and excitation limit setpoint.

To realize CAN control a message with ID 0x20A must be sent at least every 1 seconds
complying with the content definition described in table 10.
When CAN control is activated, but the AVR has not received a valid control message for the
last 1 seconds, CAN control is automatically disabled and normal AVR control is resumed.

Active CAN control is visualized by the CAN status LED signalling continuous orange.

Be aware that when the user enables CAN control over the voltage and/or excitation setpoints,
adjustments to the respective potentiometers on the AVR will have no immediate effect. The
adjustments will only then be effective when CAN control is disabled and AVR control is
resumed again.

CAN control

ID:0x20A

Byte

Description

Value

Unit

Remarks

0 Generator voltage setpoint

0-

255 V Phase

- Neutr

al

1 Excitation current ratio setpoint

0-

100 % Derived from

dipswitch 4 setting

2 - - - not used

3 - - - not used

4 CAN control

Bitwise

CAN commandregister

bit 0

Activate CAN voltage setpoint

1 - 0 bit 1 = active

bit 1

- 0

bit not used

bit 2

- 0

bit not used

bit 3

- 0

bit not used

bit 4

Activate CAN excitation ratio setpoint

1 – 0 bit 1 = active

bit 5

- 0

bit not used

bit 6

- 0

bit not used

bit 7

- 0

bit not used

5 - - - not used

6 - - - not used

7 - -

not used

Table 10. CAN control

Manual V3.1.1 Page 21 of 36

4. Protections and Diagnose

4.1 Led error Codes

Every triggered protection is indicated by an error code signalled by the status LED.

Table 11 shows the relation between the number of red blinks and the error condition.

Table 11. Error codes

4.2 Protections

When an error condition triggers the AVR’s protections, field excitation is limited, decreasing
the voltage setpoint to 95V. Nevertheless, the generator voltage could be higher than 95V due
to the generator’s remanent voltage.

The AVR may be reset from the error condition by interrupting the AVR supply (LH1-LH2 and
LH3-LH4) for at least 5 seconds. In case an auxiliary supply winding is used this can be
accomplished by stopping the generator. After a successful reset the AVR restarts from idle
mode and any information concerning the previous error is lost.

Manual V3.1.1 Page 22 of 36

4.2.0 Over excitation protection

The over excitation protection validates the generator field excitation measured on terminals +
and -.

If the field excitation current exceeds the threshold of 6A for longer than 5s, the over excitation
protection is triggered, decreasing the generator voltage setpoint to 95V.

An over excitation error is visualized by the status LED blinking red two times. The AVR may
be reset from the error condition by interrupting the AVR supply (LH1-LH2 and LH3-LH4) for at
least 5 seconds. In case an auxiliary supply winding is used this can be accomplished by
stopping the generator.

Diagram 11 shows a sequence of events for diagnosis purposes in case of an over excitation
error.

Diagram 11. Over excitation protection

Manual V3.1.1 Page 23 of 36

4.2.1 Generator over temperature protection

The generator over temperature protection validates the generator temperature, sensed by
either a clixon, PTC or KTY84-130 sensor, connected to terminals T1-T2. The over
temperature limiting and protection can be disabled by omitting the temperature sensor and
shorting terminals T.Disable.

In case a KTY84-130 sensor is connected, the over temperature protection is triggered upon
exceeding a generator temperature of 200ºC for 2 seconds. In case a clixon or PTC is
connected, the over temperature protection is triggered upon exceeding the specific sensor
temperature threshold for 2 seconds. As is described in 3.2.2, fitting a clixon or PTC, instead
of a KTY84-130 sensor, effectively disables the generator over temperature limiting.

If the generator over temperature protection is triggered, the generator voltage setpoint is
decreased to 95V.

A generator over temperature error is visualized by the status LED blinking red three times.
The AVR may be reset from the error condition by interrupting the AVR supply (LH1-LH2 and
LH3-LH4) for at least 5 seconds. In case an auxiliary supply winding is used this can be
accomplished by stopping the generator.

Diagram 12 shows a sequence of events for diagnosis purposes in case of a generator over
temperature error.

Diagram 12. Generator over temperature

Manual V3.1.1 Page 24 of 36

4.2.2 AVR over temperature protection

The AVR over temperature protection validates the AVR temperature, measured by an
internal sensor. If the over temperature limit of 85°C is exceeded for 20 seconds, the
generator voltage setpoint is decreased to 95V.

An AVR over temperature error is visualized by the status LED blinking red four times.

The AVR may be reset from the error condition by interrupting the AVR supply (LH1-LH2 and
LH3-LH4) for at least 5 seconds. In case an auxiliary supply winding is used this can be
accomplished by stopping the generator.

Diagram 13 shows a sequence of events for diagnosis purposes in case of an AVR over
temperature error.

Diagram 13. AVR over temperature

Manual V3.1.1 Page 25 of 36

4.2.3 Phase loss / phase sequence protection

The functionality of the protection is twofold.

First; The phase sequence protection validates the order of the phase sequence connected to
terminals U, V and W to be clockwise (U

→V→W).
Second, the phase loss protection validates the presence of all three generator phases on the
terminals U, V and W.

In case an incorrect phase sequence is measured, the protection is usually triggered during
the build up mode of the AVR. The protection decreases the generator voltage to 95V and
visualizes the error by blinking the status LED red five times.

Second; In case one of the phases U, V or W is not sensed for at least 500ms, the phaseloss
protection is triggered.

If the phaseloss protection is triggered, the generator voltage setpoint is decreased to 95V and
the error is visualized by the status LED blinking red five times.

The AVR may be reset from the error condition by interrupting the AVR supply (LH1-LH2 and
LH3-LH4) for at least 5 seconds. In case an auxiliary supply winding is used this can be
accomplished by stopping the generator.

Diagram 14 shows a sequence of events for diagnosis purposes in case of a phaseloss error.

Diagram 14. Phaseloss

Manual V3.1.1 Page 26 of 36

4.2.4 Over voltage protection 110%

The 20% over voltage protection validates the generator voltage on terminals U,V and W.
If an over voltage condition is detected but relieved within two seconds, the protection is not
triggered and normal control proceeds.

If the over voltage limit of 110% is exceeded for at least 2 second, the over voltage protection
is triggered and the generator voltage setpoint is decreased to 95V.
The over voltage error is visualized by the status LED blinking six times.

The AVR may be reset from the error condition by interrupting the AVR supply (LH1-LH2 and
LH3-LH4) for at least 5 seconds. In case an auxiliary supply winding is used this can be
accomplished by stopping the generator.

Diagrams 15 shows a sequence of events for diagnosis purposes in case of an 110% over
voltage error.

Diagram 15. 110% Over voltage

Manual V3.1.1 Page 27 of 36

4.2.5 Over voltage protection 125%

The 125% over voltage protection validates the generator voltage on terminals U,V and W.
If an over voltage condition is detected but relieved within one second, the protection is not
triggered and normal control proceeds.

If the over voltage limit of 125% is exceeded for at least 1 second, the over voltage protection
is triggered and the generator voltage setpoint is decreased 95V.
The over voltage error is visualized by the status LED blinking seven times. The AVR may be
reset from the error condition by interrupting the AVR supply (LH1-LH2 and LH3-LH4) for at
least 5 seconds. In case an auxiliary supply winding is used this can be accomplished by
stopping the generator.

Diagrams 16 shows a sequence of events for diagnosis purposes in case of an 125% over
voltage error.

Diagram 16. 125% Over voltage

Manual V3.1.1 Page 28 of 36

5. Settings and adjustments

5.1 Generator Voltage

The generator voltage setpoint is user adjustable
by means of the V potentiometer. The voltage
potentiometer range is U

nom

±12.5%. Turning the
potentiometer clockwise increases the generator
voltage, turning counter clockwise decreases the
generator voltage.

5.2 P & I stability

The generator stability and dynamic response are adjustable by means of the P, proportional,
and I, integral action, potentiometers.
Turning the proportional action potentiometer
clockwise increases the proportional gain, turning
counterclockwise decreases the proportional gain.
Turning the integral action potentiometer
clockwise decreases the integral time, turning
counterclockwise increases the integral time.
Tuning the PI-controller must be performed by a
control expert to prevent damage to the AVR and
generator.

5.3 Underspeed frequency

Potentiometer F sets the underspeed frequency
setpoint. The underspeed frequency setpoint is
used to decrease voltage, according a VPH slope,
at low rpm. This protects the exciter field against
over excitation during constant voltage control.
For more information, see diagram 2.

As shown in figure 9, turning the potentiometer
completely counter clockwise disables the
underspeed protection.
Be aware that disabling the underspeed protection
is not recommendable. This could lead to over
excitation, which will inflict serious damage to the
generator.

Turning clockwise increases the frequency setpoint from 40Hz to 65Hz

Fig 5. Voltage adjustment

Fig 6. Stability adjustments

Fig 8. Underspeed adjustment

Manual V3.1.1 Page 29 of 36

5.4 Dipswitch settings

The dipswitches are used for enabling or setting several AVR functions. The layout and
positions are depicted in table 12.
Dipswitch positions must not be changed during
operation. Always interrupt the AVR supply or stop
the generator before switching any of the
dipswitches.

Dipswitch

Description

OFF

ON

1

Sensing Voltage selection

400Vac

230V

ac

2

Phaseloss protection

Protection disabled

Protection enabled

3

Control mode selection

Constant Voltage

Volt Per Hertz

4

Overexcitation threshold

2A 4A

Table 12. Dipswitch settings

Fig 9. Dipswitch settings

DO NOT CHANGE DIPSWITCH
SETTINGS DURING OPERATION

Manual V3.1.1 Page 30 of 36

5.5 T.Disable header

When no generator over temperature limiting or
protection is desired, this can be disabled by
shorting the T.Disable header with a
prefabricated link. In this case it is still allowed,
but not required to connect a temperature
sensor at terminals T1, T2.

5.6 SE header

Caution: Never fit or remove the SE link when
the generator is operation, this could result in
serious electrical shock.

Shorting the SE header with a supplied
prefabricated link, enables the self excitation
function of the AVR. Self excitation can be used
if the AVR supply voltage is insufficient to start
voltage control. See 3.3.0 for an explanation of
this feature.

5.7 EXT.POT. header

The generator voltage setpoint is also user
adjustable by means of an external 10 kΩ
potentiometer. The external potentiometer
range is U

nom

-15%. Increasing the impedance,
decreases the generator voltage. When no
external potentiometer is fitted, the EXT.POT.
terminals must be shorted with one of the
supplied links.

5.8 CAN Termination header

Shorting the CAN Termination header, by
placing a prefabricated link, enables CAN bus
termination. The terminator resistance is 120
Ohm. The header must be shorted if the AVR
is connected as a CAN bus endpoint.

Fig 10. T.Disable header

Fig 13. CAN Termination header

Fig 11. Self excitation header

Fig 12. EXT.POT. header

Manual V3.1.1 Page 31 of 36

5.9 Factory settings

All new or AVR’s returned from service are supplied with factory settings as described in table

13. Adjusting the factory settings must only be performed by qualified personnel who
understand the danger of electric shock hazards and have read and understood the user
instructions

Parameter

Value

Unit

Output Voltage

400 Vac

Overe

xcitation

threshold

2A I

exc

P & I stability

Middle position

D 0 %

Underspeed

setpoint

47 Hz

Phaseloss protection

Disabled

-

Control mode selection

Constant Voltage

T.Disable header

Sho

rted with link

SE header

Open

EXT.POT header

Shorted with link

CAN termination header

Shorted with link

Ceramic

Fuse

5x20mm

4 AT

Table 13. Factory settings

Manual V3.1.1 Page 32 of 36

6. Wiring Diagrams

6.1 Wiring diagram single auxiliary supply winding

Manual V3.1.1 Page 33 of 36

6.2 Wiring diagram double auxiliary supply winding

Manual V3.1.1 Page 34 of 36

6.3 Wiring diagram transformer supply

LX4

Connection Diagram

ing. R. van Beekum

04-04-2014

V1.1

ENG

DATE

VERSION

1/1PAGE

WVUS2S1T1 T2LH3 LH4 LH1 LH2- +

on

dip

1 2 3 4

Status

LED

V P I D

F

FUSE

SE

T.Disable

EXT.POT.

CAN Interface

JTAG

Interface

CAN LED

CAN Termination

LX4 V2.0

Firmware: V0.x

Nr: 1234

Hardware: V0.x

Prod: 0106

Ede NL

Exciter Field Rotor Stator

Breaker

Bus

Manual V3.1.1 Page 35 of 36

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.

- maximum cooling (direction of cooling ribs and direction of airflow) is achieved.

- Mounting no humid air can flow through the product or condensation occurs.

- dust or other materials or residue will not remain in or on the product.

- the maximum vibration is not exceeded.

- 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 J (+) and K (-

),
or Phase and neutral, or S and T.

- 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 at one side with an 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 X (+) and XX (-), 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 behavior 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 field resistance reduces voltage spikes. If necessary filter can be fitted additionally. (e.g. snubber,
RC-network)

- Upon problems during commissioning, faulty behavior 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.

Manual V3.1.1 Page 36 of 36

Contact

EMRI Electronics B.V.

Manufacturer

Morsestraat 10
6716 AH, Ede, Netherlands
Tel: [phone]
Fax: [phone]
Website: www.emri.nl
E-mail: [e-mail]

ICELAND,

Hafnarfjordur

Rafeining ehf

Tel: [phone]
Fax: [phone]
Website: www.rafeining.is
E-mail: [e-mail]

POLAND,

Gdynia

An-Elec Sp. z o.o.

Tel: [phone]
Fax: [phone]
Website: http://an-elec.pl

E-mail:

info@an

-

elec.pl

INDIA,

Faridabad

Power Solutions

Tel: [phone]
Fax:: [phone]
Website: www.psolindia.com
E-mail: [e-mail]

SOUTH AFRICA,

Roodepoort

Yneldo Electronics

Tel: [phone]
Fax: [phone]
Website: www.yneldo.com

E-mail:

[e-mail]

POLAND,

Szczecin-Mierzyn

Marel Serwis

Tel: [phone]
Fax: [phone]
Website: www.marel.szczecin.pl
E-mail: [e-mail]

CHILE,

Santiago

Lucio Vicencio y CIA.LTDA

Tel: [phone]
Fax:: [phone]
Website: www.luciovicencio.cl

E-mail:

[e-mail]

NORWAY,

Bergen

Frydenbø Electric A/S

Tel: [phone]
Fax: [phone]
Website: www.frydenbo.no
E-mail: [e-mail]

SINGAPORE,

Singapore

Cyclect Electrical Engineering

Tel: [phone]
Fax: [phone]
Website: www.cyclect.com.sg
E-mail: [e-mail]

THAILAND,

Bang Lamung

Semtec Maritime/Genetech Co.Ltd

Tel: [phone]
Fax: [phone]
Website: semtecmaritime.com/

Email

:

[e-mail]

UNITED

ARAB

EMIRATES,

Sharjah

KDU Technical Services

Tel: [phone]
Fax: [phone]
Website: www.kdutech.ae

E-mail:

[e-mail]

SWEDEN,

Kungälv

Elektrisk Drivteknik EDT AB

Tel: [phone]
Tel: [phone]
Website: www.edtab.se

E-mail:

[e-mail]

GREECE,

Piraeus

Stavros Kassidiaris S.A.

Tel: [phone]
Fax: [phone]
Website: www.kassidiaris.gr

E-mail: [e-mail]

CANARY ISLANDS,

Las Palmas

Zamakona Yards

Tel: [phone]
Fax: [phone]
Website: www.zamakonayards.com/

E-mail:

[e-mail]

UNITED KINGDOM,

Stockton on Tees

MJR Controls

Tel: [phone]
Fax: [phone]
Website: www.mjrcontrols.com

Email:

[e-mail]

UNITED STATES,

Kemah - Texas

Ramtec Marine Systems LLC

Tel: [phone]
Fax: [phone]
Website:

www.ramtec-marine.com

Email:

waling@ramtec

-

marine.com

REPUBLIC OF PANAMA,

Panama

PASRAS S.A.

Tel: [phone]
Fax: [phone]
Website: www.pasras.com
E-mail: [e-mail]

ROMANIA,

Constanta

SAMTEC SRL

Tel: [phone]
Fax: [phone]
Website: www.samtec.ro
E-mail: [e-mail]

UNITED KINGDOM,

Cheadle Hulme

TGS Total Generator Solutions Ltd

Tel: [phone]
Fax: [phone]
Website: http://totalgeneratorsolutions.com

Email:

[e-mail]

POLAND,

Szczecin

MARCONTREL

Tel: [phone]
Fax: [phone]
Website: www.marcontrel.com

E-mail:

[e-mail]