Woodward 9907-252 User manual

Installation and Operation Manual
Load Sharing Module
0.5–4.5 Vdc Output
9907-252
Manual 02035 (Revision B)

DEFINITIONS
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
•DANGER—Indicates a hazardous situation which, if not avoided, will result in death
or serious injury.
•WARNING—Indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
•CAUTION—Indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
•NOTICE—Indicates a hazard that could result in property damage only (including
damage to the control).
•IMPORTANT—Designates an operating tip or maintenance suggestion.
The engine, turbine, or other type of prime mover should be equipped with an
overspeed shutdown device to protect against runaway or damage to the prime
mover with possible personal injury, loss of life, or property damage.
The overspeed shutdown device must be totally independent of the prime mover
control system. An overtemperature or overpressure shutdown device may also
be needed for safety, as appropriate.
Read this entire manual and all other publications pertaining to the work to be performed before
installing, operating, or servicing this equipment. Practice all plant and safety instructions and
precautions. Failure to follow instructions can cause personal injury and/or property damage.
This publication may have been revised o
r
updated since this copy was produced. To verify that
you have the latest revision, be sure to check the Woodward website:
www.woodward.com/pubs/current.pdf
The revision level is shown at the bottom of the front cover after the publication number. The latest
version of most publications is available at:
www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get the
latest copy.
Any unauthorized modifications to or use of this equipment outside its specified mechanical,
electrical, or other operating limits may cause personal injury and/or property damage, including
damage to the equipment. Any such unauthorized modifications: (i) constitute "misuse" and/or
"negligence" within the meaning of the product warranty thereby excluding warranty coverage
for any resulting damage, and (ii) invalidate product certifications or listings.
To prevent damage to a control system that uses an alternator or batter
y
-charging
device, make sure the charging device is turned off before disconnecting the battery
from the system.
To prevent damage to electronic components caused by improper handling, read
and observe the precautions in Woodward manual 82715, Guide for Handling and
Protection of Electronic Controls, Printed Circuit Boards, and Modules.
Woodward Governor Company reserves the right to update any portion of this publication at any time. Information
provided by Woodward Governor Company is believed to be correct and reliable. However, no responsibility is assumed
by Woodward Governor Company unless otherwise expressly undertaken.
© Woodward 1999
All Rights Reserved

Manual 02035 Load Sharing Module
Woodward i
Contents
ELECTROSTATIC DISCHARGE AWARENESS .................................................. II
CHAPTER 1. GENERAL INFORMATION...........................................................1
Introduction.............................................................................................................1
Description..............................................................................................................1
CHAPTER 2. INSTALLATION..........................................................................6
Introduction.............................................................................................................6
Unpacking...............................................................................................................6
Location Considerations .........................................................................................6
General Wiring Requirements ................................................................................7
Power Requirements ..............................................................................................7
Shielded Wiring ......................................................................................................7
Generator Connections ..........................................................................................9
Current Transformers .............................................................................................9
Load Sharing Lines, Droop, and Auxiliary Contacts...............................................9
Output to the Engine Speed Control ....................................................................10
Synchronization Connections...............................................................................10
Speed Trim Potentiometer....................................................................................10
External 5 Vdc Reference (Optional)....................................................................10
CHAPTER 3. SETUP AND CALIBRATION ......................................................11
Introduction...........................................................................................................11
Phasing Check .....................................................................................................12
Phase Correction Procedure ................................................................................13
Load Gain Adjustment ..........................................................................................16
Droop Adjustment.................................................................................................17
Setting Droop for an Isolated Load.......................................................................17
Setting Droop for an Infinite Bus ..........................................................................18
CHAPTER 4. THEORY OF OPERATION.........................................................19
Introduction...........................................................................................................19
Power Supply .......................................................................................................19
Power Sensor .......................................................................................................19
Load Comparator Circuit ......................................................................................19
Speed Trim Circuit................................................................................................19
Isochronous Load Sharing....................................................................................20
Droop Operation ...................................................................................................20
Auxiliary Equipment..............................................................................................20
0.5–4.5 Vdc Output...............................................................................................20
CHAPTER 5. TROUBLESHOOTING...............................................................21
CHAPTER 6. SERVICE OPTIONS .................................................................23
Product Service Options.......................................................................................23
Woodward Factory Servicing Options ..................................................................24
Returning Equipment for Repair...........................................................................25
Replacement Parts ...............................................................................................25
Engineering Services............................................................................................26
How to Contact Woodward...................................................................................26
Technical Assistance............................................................................................27
APPENDIX.LSM CONTROL SPECIFICATIONS..............................................28
DECLARATIONS.........................................................................................31

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ii Woodward
Illustrations and Tables
Figure 1-1. Typical System Using a Load Sharing Module ....................................1
Figure 1-2. Outline Drawing of Load Sharing Module ............................................2
Figure 1-3. Block Diagram of Load Sharing Module ..............................................3
Figure 1-4. Plant Wiring Diagram of Load Sharing Module....................................5
Figure 2-1. Preparation of Shielded Cables ...........................................................8
Figure 3-1. Temporary CT Connections...............................................................14
Figure 3-2. Droop Adjustment ..............................................................................17
Electrostatic Discharge Awareness
All electronic equipment is static-sensitive, some components more than others.
To protect these components from static damage, you must take special
precautions to minimize or eliminate electrostatic discharges.
Follow these precautions when working with or near the control.
1. Before doing maintenance on the electronic control, discharge the static
electricity on your body to ground by touching and holding a grounded metal
object (pipes, cabinets, equipment, etc.).
2. Avoid the build-up of static electricity on your body by not wearing clothing
made of synthetic materials. Wear cotton or cotton-blend materials as much
as possible because these do not store static electric charges as much as
synthetics.
3. Keep plastic, vinyl, and Styrofoam materials (such as plastic or Styrofoam
cups, cup holders, cigarette packages, cellophane wrappers, vinyl books or
folders, plastic bottles, and plastic ash trays) away from the control, the
modules, and the work area as much as possible.
4. Do not remove the printed circuit board (PCB) from the control cabinet
unless absolutely necessary. If you must remove the PCB from the control
cabinet, follow these precautions:
•Do not touch any part of the PCB except the edges.
•Do not touch the electrical conductors, the connectors, or the
components with conductive devices or with your hands.
•When replacing a PCB, keep the new PCB in the plastic antistatic
protective bag it comes in until you are ready to install it. Immediately
after removing the old PCB from the control cabinet, place it in the
antistatic protective bag.
To prevent damage to electronic components caused by improper
handling, read and observe the precautions in Woodward manual
82715, Guide for Handling and Protection of Electronic Controls,
Printed Circuit Boards, and Modules.

Manual 02035 Load Sharing Module
Woodward 1
Chapter 1.
General Information
Introduction
The Woodward Load Sharing Module is made for use with engines equipped with
speed controls that accept a 0–5 Vdc speed setting. The Load Sharing Module
allows use of Woodward power generation accessories and allows load sharing
between engines equipped with speed controls that are not manufactured by
Woodward and engines controlled with Woodward electronic controls, or controls
using other Woodward load sharing modules.
Description
The Load Sharing Module provides isochronous and droop load-sharing
capability for engines in generator set applications. Additional equipment in the
control system can include the Woodward SPM-A Synchronizer, Import/Export
Control, Automatic Generator Loading Control, and Automatic Power Transfer
and Loading Control.
Figure 1-1 shows a typical system using a Load Sharing Module.
Figure 1-1. Typical System Using a Load Sharing Module

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Figure 1-2. Outline Drawing of Load Sharing Module

Manual 02035 Load Sharing Module
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Figure 1-3. Block Diagram of Load Sharing Module

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Manual 02035 Load Sharing Module
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Figure 1-4. Plant Wiring Diagram of Load Sharing Module

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Chapter 2.
Installation
Introduction
This section contains general installation instructions for the Load Sharing
Module. Environmental precautions and location considerations are included to
determine the best location for the Load Sharing Module. Additional information
includes unpacking instructions, electrical connections, and an installation check-
out procedure.
Unpacking
Before handling the Load Sharing Module, read page ii, Electrostatic Discharge
Awareness. Be careful when unpacking the Load Sharing Module. Check the unit
for signs of damage such as bent or dented panels, scratches, and loose or
broken parts. Notify the shipper of any damage.
Location Considerations
Consider these requirements when selecting the mounting location:
•Adequate ventilation for cooling
•Space for servicing and repair
•Protection from direct exposure to water or to a condensation-prone
environment
•Protection from high-voltage or high-current devices, or devices which
produce electromagnetic interference
•Protection from excessive vibration
•An ambient operating temperature range of –40 to +70 °C (–40 to +158 °F)
Do not mount the Load Sharing Module on the engine.
Figure 1-2 is an outline drawing of the Load Sharing Module. Install the unit as
close as practical to the electronic engine control, but not on the engine itself. It
may be installed in any position.
To maintain compliance with CE marking requirements, the European Union Low
Voltage Directive requires that the Load Sharing Module (LSM) be mounted in an
IP43 enclosure as defined in EN60529. Access to the Load Sharing Module must
be restricted to qualified personnel.

Manual 02035 Load Sharing Module
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General Wiring Requirements
The circled ground symbol identifies the Protective Earth Terminal. This
terminal must be connected directly to protective earth using a
grounding conductor at least as large as those used on terminals 1
through 9. The insulation of the grounding conductor must be of green
and yellow color.
This symbol identifies functional or EMC earth. This terminal is to be
used for cable shield connections only. It is not to be used as a
protective earth terminal.
External wiring connections and shielding requirements for a typical installation
are shown in the plant wiring diagram, Figure 1-4. These wiring connections and
shielding requirements are explained in more detail in this chapter.
To maintain compliance with CE marking requirements, the Low Voltage
Directive requires that the Load Sharing Module must only be connected to Class
III equipment.
Wiring for the Load Sharing Module must be suitable for at least 90 °C (194 °F)
and also be suitable for the maximum installed operating temperature.
The Load Sharing Module must be permanently connected and employ fuses or
circuit breakers in each of the PT lines to limit current to the LSM PT inputs to no
more than 5 A. In addition, a 2 A fast-acting fuse or circuit breaker must be
provided in the 24 Vdc power supply line.
All terminal block screws must be tightened to 0.56 to 0.79 N·m (5.0 to 7.0 lb-in).
To maintain compliance with CE marking requirements, the EMC Directive
requires that all shields be connected to the terminals provided per the plant
wiring diagram, Figure 1-4.
Power Requirements
The Load Sharing Module is powered from a 24 Vdc source. The 24 Vdc source
must be a minimum of 18 Vdc and a maximum of 32 Vdc continuous. If a battery
is used for operating power, an alternator or other battery charging device is
necessary to maintain a stable supply voltage.
To prevent possible serious damage to the Load Sharing Module,
make sure the alternator or other battery charging device is turned
off or disconnected before disconnecting the battery from the unit.
Shielded Wiring
All shielded cable must be twisted conductors with either a foil or braided shield.
Do not attempt to tin (put solder on) the braided shield. All signal lines should be
shielded to prevent picking up stray signals from adjacent equipment. Connect
the shields to the terminals indicated in the plant wiring diagram. Wire exposed
beyond the shield must be as short as possible.

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The other end of the shields must be left open and insulated from any other
conductor. Do not run shielded signal wires with other wires carrying large
currents. See Application Note 50532, EMI Control for Electronic Governing
Systems, for more information.
Where shielded cable is required, cut the cable to the desired length and prepare
the cable as instructed below and shown in Figure 2-1.
Figure 2-1. Preparation of Shielded Cables
1. Strip outer insulation from both ends, exposing the braided or spiral wrapped
shield. Do not cut the shield on the end nearest to the Load Sharing Module.
Cut off the shield on the end away from the unit.
2. Use a sharp, pointed tool to carefully spread the strands of the shield.
3. Pull the inner conductors out of the shield. Twist braided shields to prevent
fraying.
4. Connect lugs to the shield and to the control wires. Number 6 slotted or
round crimp-on terminals are used for most installations. Connect the wires
to the appropriate terminals on the module.
Installations with severe electromagnetic interference (EMI) may require shielded
wire run in conduit, double shielded wire, or other precautions.

Manual 02035 Load Sharing Module
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Generator Connections
Use 1 mm² (18 AWG) or larger wire for all PT and CT connections.
The spacing between the lugs on terminals 3 and 4 must be 6.5 mm
(0.256 inch) or greater to comply with the European Union Low
Voltage Directive (see Figure 1-4). The lugs must have insulated
sleeves.
Connections from the potential transformers and current
transformers must be made correctly in regard to the three phases
for the Load Sharing Module to operate correctly. Sorting out the
three phases at the module is tedious and requires numerous
generator starts and stops. If at all possible, make sure that the
wiring is correctly done at the time of installation and the phases
correctly and permanently identified at the generator and at the
module.
Connect the PT output from the A leg to terminal 1. Connect the PT output from
the B leg to terminal 2. Connect the PT output from the C leg to terminal 3. Size
the potential transformers to produce 100–240 Vac.
Current Transformers
Power source current transformers should be sized to produce 5 A secondary
current with maximum generator current (3–7 A secondary current at full load is
acceptable). CT burden is 0.1 VA. To prevent lethal high voltage from developing
on leads to the terminals, the Load Sharing Module contains internal burden
which must be connected across the power source current transformers
whenever the unit is running. Ammeters may be installed on the leads from the
current transformers.
Connect phase “A” CT to terminals 4 and 5. Connect phase “B” CT to terminals 6
and 7. Connect Phase “C” CT to terminals 8 and 9. Observe correct phasing as
shown in the plant wiring diagram, Figure 1-4.
Load Sharing Lines, Droop, and Auxiliary Contacts
The droop contact for selecting droop or isochronous operation is wired in series
with the circuit breaker auxiliary contact between terminals 13 and 14. When both
the droop contact and circuit breaker auxiliary contact are closed, the Load
Sharing Module is in the isochronous load sharing mode. In this mode the
internal load-sharing-line relay is energized, the droop signal is disabled, and the
load matching circuit is connected to the load-sharing lines, permitting
isochronous load sharing.
The Load Sharing Module is in the droop mode when EITHER the droop contact
or the circuit breaker auxiliary contact is open. If the droop contact is open, the
Load Sharing Module remains in the droop mode even when the circuit breaker
auxiliary contact is closed. If droop is not desired when the auxiliary contact is
open, turn the droop potentiometer fully counterclockwise.
Use a single pole, single-throw switch with a 0.1 A minimum rating for the “open
for droop” switch.

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Output to the Engine Speed Control
Use twisted 0.5 mm² (20 AWG) or larger shielded wire to connect the 0.5–4.5
Vdc output signal from terminals 19 (+/signal output), 20 (common), and 21
(optional, external 5 Vdc reference) to the control. Connect the shield to the
closest chassis screw only. Do not connect the shield at the speed control end of
the wiring.
Synchronization Connections
If an SPM-A synchronizer is used, connect twisted-pair 0.5 mm² (20 AWG) or
larger shielded wire from the synchronizer to terminals 24(+) and 25(–). Tie the
shield to the closest chassis screw. Do not connect the shield at the synchronizer
end of the wiring.
Speed Trim Potentiometer
If a speed-trim potentiometer is used, connect a 10 kΩ10-turn potentiometer to
terminals 26 (CW), 27 (wiper), and 28 (CCW). Use 0.5 mm² (20 AWG) or larger
shielded wire, and connect the shield to the closest chassis screw. Do not
connect the potentiometer end of the shield.
The potentiometer is used to move the speed setting when manually
synchronizing the generator or to change load demand in droop mode.
External 5 Vdc Reference (Optional)
An external +5 Vdc reference voltage may be connected between terminal 21(+)
and chassis ground (–). The reference voltage determines the zero bias output
level, 0.50 x Vref, and the minimum and maximum output range, 0.1 x Vref and
0.9 x Vref. Connection to an external reference will automatically override the
LSM internal 5 volt reference.
When using a DDEC III or IV control, terminal 916 could be connected to terminal
21. Terminal 916 is a 5 Vdc reference from the DDEC control that is referenced
to terminal 952 that is connected to terminal 20 of the LSM.

Manual 02035 Load Sharing Module
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Chapter 3.
Setup and Calibration
Introduction
Use this calibration procedure after a Load Sharing Module is installed on a
generator set, to obtain the needed operating characteristics during load sharing.
1. Check the input power on terminals 15(+) to 16(–) for 24 Vdc. Proper
polarity must be maintained.
2. Remove wires from load sharing line terminals 10 and 11, and from the
SPM-A Synchronizer (if used) at terminals 24 and 25.
3. Select isochronous operation by shorting terminals 13 and 14.
4. If a speed setting potentiometer is used, set it to mid position (50%).
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
5. Start the engine according to the engine manufacturer’s instructions. Adjust
the engine for rated speed. Apply full load to the generator set.
The most accurate calibration is made at full load. However, if it is
not possible to run the generator set at full load, run it at less than
full load, and reduce the voltage readings given in this calibration
procedure proportionally. For example: run a 200 kW generator set at
100 kW and divide all voltages given in this calibration procedure by
2. If you reduce the load in this manner, be sure to reduce it by the
same amount throughout the calibration procedure.
6. Set the LOAD GAIN potentiometer fully clockwise.
7. Check the load signal voltage between terminals 22 and 23. Adjust the
LOAD GAIN potentiometer for 6.0 Vdc signal. If this voltage is not
obtainable, set the load signal as close as possible to 6 Vdc.
8. Remove the load from the generator set.
9. Check the voltage between terminals 22 and 23. This voltage should be 0.0
± 0.25 Vdc. If this voltage is not correct, the Load Sharing Module is faulty or
there may still be load on the generator.

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Phasing Check
HIGH VOLTAGE—A high voltage across open CTs (current
transformers) can cause death or serious injury. Do not disconnect a
CT from the Load Sharing Module while the engine is running. The
CTs can develop dangerously high voltages and may explode if open
circuited while the engine is running.
For this check, the generator set must be running isochronously, not paralleled,
and with a power factor greater than 0.8.
10. Check that the potential connections are made as follows and correct them
if they are not.
•Phase A to terminal 1
•Phase B to Terminal 2
•Phase C to Terminal 3
The most accurate calibration is made at full load. However, if it is
not possible to run the generator set at full load, run it at less than
full load, and reduce the voltage readings given in this calibration
procedure proportionally. For example: run a 200 kW generator set at
100 kW and divide all voltages given in this calibration procedure by
2. If you reduce the load in this manner, be sure to reduce it the same
amount throughout this calibration procedure.
11. Start the engine and apply full load to the generator set.
12. Using a dc voltmeter, measure the load signal at terminals 22 and 23. Adjust the
load gain potentiometer to give a 6 Vdc load signal. If 6 Vdc is not obtainable, set
the load signal as close as possible to 6 Vdc. Record this voltage.
13. Shut down the generator set.
HIGH VOLTAGE—A high voltage across open CTs (current
transformers) can cause death or serious injury. Do not disconnect a
CT from the Load Sharing Module while the engine is running. The
CTs can develop dangerously high voltages and may explode if open
circuited while the engine is running.
14. Disconnect the wire from terminal 5 that comes from the phase “A” CT and
connect both wires from this CT to terminal 4.
15. Start the generator set and apply full load.
16. Measure the load signal at terminals 22 and 23. If the phase “B” and “C”
current transformers are connected correctly, this voltage will be 1/3 lower
than the voltage recorded in step 13. For example: if the reading was 6 volts
in step 13, the reading in this step should be approximately 4 volts.
17. Shut down the generator set.
18. Reconnect the phase “A” CT wire to terminal 5.
19. If the reading in step 16 was correct, proceed to Load Gain Adjustment later
in this chapter. Otherwise, perform the following Phase Correction
Procedure.

Manual 02035 Load Sharing Module
Woodward 13
Phase Correction Procedure
If this procedure is followed, the correct connection of the current transformers is
assured; the correct CT will be connected to the correct input on the Load
Sharing Module with the correct polarity. Use this procedure only if the Phasing
Check indicates that the phasing is incorrect.
A CT for any phase (A, B, or C), will produce the most positive load signal
voltage when it is connected, in the proper polarity, to the terminals on the Load
Sharing Module which correspond to the same phase. Any other connections of
this CT will produce a less positive load signal voltage. This procedure makes
trial connections of the first CT to all three CT inputs on the Load Sharing
Module, polarized both ways on each CT input. The load signal voltage is
recorded for each connection, and the CT is then connected to the CT input
terminals that produced the most positive load signal voltage and with the polarity
that produced the most positive load signal voltage.
In a like manner, the second CT is tried on each of the two remaining CT input
terminals in each polarity, then connected, in the correct polarity, to the terminals
which produced the most positive load signal voltage.
The remaining CT is then connected to the remaining CT input and the load
signal checked for each polarity. This CT is then connected to the CT input,
polarized so that it produces the most positive load signal voltage.
When the procedure is completed, all three CTs are connected to the proper CT
inputs on the Load Sharing Module, with the correct polarity, and are now labeled
with their correct designations.
The procedure for correcting phase wiring requires that the generator set be shut
down and the current transformers disconnected many times. For convenience
during the phasing check, the temporary method of connecting the current
transformers shown in Figure 3-1 is recommended. By connecting a burden
resistor (a 0.5 Ω, 20 W resistor), across each current transformer, that current
transformer can be disconnected from the Load Sharing Module after removing
all load. The connections between the terminal strip and the Load Sharing
Module can be changed with the generator set running; however, remove all load
before any changes in connections are made. Do not disconnect a wire from a
current transformer with load on the system. After completion of the procedure
remove the terminal strip and the resistors.
HIGH VOLTAGE—A high voltage across open CTs (current
transformers) can cause death or serious injury. Do not disconnect a
CT from the Load Sharing Module while the engine is running. The
CTs can develop dangerously high voltages and may explode if open
circuited while the engine is running.
For this procedure, the generator set must be running isochronously, not
paralleled, and with a power factor greater than 0.8.
1. Start with the generator shut down.
2. Label each CT wire with the phase and polarity that you think it should be.
Even though this identification may prove to be wrong during this procedure,
this step is necessary so that the individual wires may be identified during
the description of the procedure.

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Figure 3-1. Temporary CT Connections
3. Disconnect the phase “B” CT wires from terminals 6 and 7 and connect
these two wires together. Use a small screw and nut and tape the
connection.
4. Disconnect the phase “C” CT wires from terminals 8 and 9 and connect
these two wires together. Use a small screw and nut and tape the
connection.
5. Connect the two wires from the phase “A” CT to phase “A” input terminals 4
and 5.
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
6. Start the engine and apply full load.
7. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
8. Shut the generator set down and reverse the phase “A” wires on terminals 4
and 5.
9. Start the engine and apply full load.
10. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
11. Shut the generator set down.
12. Remove the phase “A” CT wires from terminal 4 and 5 and connect the
phase “A” CT wires to the phase “B” input terminals 6 and 7.

Manual 02035 Load Sharing Module
Woodward 15
13. Start the engine and apply full load.
14. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
15. Shut the generator set down and reverse the phase “A” CT wires on
terminals 6 and 7.
16. Start the engine and apply full load.
17. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
18. Shut down the generator set.
19. Remove the phase “A” CT wires from terminal 6 and 7 and connect the
phase “A” CT wires to the phase “C” input terminals 8 and 9.
20. Start the engine and apply full load.
21. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
22. Shut the generator set down and reverse the phase “A” wires on terminals 8
and 9.
23. Start the engine and apply full load.
24. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
25. Shut down the generator set.
26. Remove the phase “A” CT wires from terminal 8 and 9 and connect the
wires to the pair of terminals, in the same polarity, that produced the most
positive load signal voltage.
27. Untape and disconnect the Phase “B” CT wires. Connect the phase “B” CT
wires to one pair of the two remaining CT input terminals on the Load
Sharing Module.
28. Start the generator set and apply full load.
29. Measure the load signal voltage at terminals 22 and 23 and record this
voltage.
30. Shut the generator set down and reverse the phase “B” wires on the CT
input terminals.
31. Start the engine and apply full load.
32. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
33. Shut down the generator set.
34. Remove the phase “B” CT wires from the terminals they are connected to
and connect them to the remaining pair of CT input terminals on the Load
Sharing Module.

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35. Start the generator set and apply full load.
36. Measure the load signal at terminals 22 and 23 and record this voltage.
37. Shut the generator set down and reverse the phase “B” wires on the CT
input terminals.
38. Start the engine and apply full load.
39. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
40. Shut down the generator set.
41. Remove the phase “B” CT wires from the CT input terminals and connect
the wires to the pair of terminals, in the same polarity, that produced the
most positive load signal voltage.
42. Untape and disconnect the Phase “C” CT wires. Connect the phase “C” CT
wires to remaining pair of CT input terminals on the Load Sharing Module.
43. Start the generator set and apply full load.
44. Measure the load signal voltage at terminals 22 and 23 and record this
voltage.
45. Shut the generator set down and reverse the phase “C” wires on the CT
input terminals.
46. Start the engine and apply full load.
47. Measure the load signal voltage between terminals 22 and 23 and record
this voltage.
48. Shut down the generator set.
49. Remove the phase “C” CT wires from the CT input terminals and connect
the wires to the pair of terminals, in the same polarity that produced the
most positive load signal voltage.
50. Label each wire with the designation of the terminal to which it is now
connected. Be sure and remove the original designations to avoid future
confusion.
Load Gain Adjustment
For this procedure, the generator set must be running isochronously, not
paralleled, and with a power factor greater than 0.8.
1. Start the generator set and run at full load.
2. Measure the load signal voltage and adjust the LOAD GAIN potentiometer
for 6 ± 0.1 Vdc.
If the load signal voltage cannot be raised to 6 volts, and the phasing has been
checked and is correct, it will be necessary to use a lower load signal voltage. Set
the full load signal voltages of all generator sets in the system to the same voltage.