Woodward 723PLUS Instructions for use

Product Manual 91623
(Revision NEW)
Original Instructions
723PLUS Standard Generator Control
LON Load Sharing
8280-1099
Woodward manual 02877 is also required.
Application Manual

General
Precautions
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.
Revisions
This publication may have been revised or updated since this copy was produced.
To verify that you have the latest revision, check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, on the publications
page of the Woodward website:
www.woodward.com/publications
The latest version of most publications is available on the publications page. If
your publication is not there, please contact your customer service representative
to get the latest copy.
Proper Use
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.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26311 , Revision Status &
Distribution Restrictions of Woodward Technical Publications, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Revisions—Changes in this publication since the last revision are indicated by a black line
alongside the text.
Woodward reserves the right to update any portion of this publication at any time. Information provided by Woodward is
believed to be correct and reliable. However, no responsibility is assumed by Woodward unless otherwise expressly
undertaken. Copyright © Woodward 2010
All Rights Reserved

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
Woodward i
Contents
WARNINGS AND NOTICES............................................................................III
ELECTROSTATIC DISCHARGE AWARENESS ................................................. IV
LIST OF ABBREVIATIONS .............................................................................V
CHAPTER 1. GENERAL INFORMATION...........................................................1
Introduction.............................................................................................................1
Associated Publications..........................................................................................1
CHAPTER 2. INPUTS AND OUTPUTS..............................................................2
Speed Sensor Inputs ..............................................................................................2
Analog Inputs..........................................................................................................2
Analog Outputs.......................................................................................................3
Discrete Inputs........................................................................................................5
Relay Driver Outputs / LED driver Outputs ............................................................7
CHAPTER 3. DESCRIPTION OF OPERATION...................................................9
Introduction.............................................................................................................9
Speed Control.........................................................................................................9
Load Control ...........................................................................................................9
Base-Load Control..................................................................................................9
Load-Sharing Control (LON) ................................................................................10
Load-Sharing Control (LSL)..................................................................................10
Unload Control......................................................................................................10
Speed Sensing .....................................................................................................10
Start Sequence & Start Fuel Limiter.....................................................................11
Synchronizing .......................................................................................................12
Fuel Limiters .........................................................................................................12
Load Rejection......................................................................................................13
Dynamics..............................................................................................................13
LON, Load Sharing, & Setup................................................................................15
Initializing the LON Network .................................................................................16
CHAPTER 4. CONFIGURE AND SERVICE MENUS..........................................17
Introduction...........................................................................................................17
Configure Mode ....................................................................................................17
Service Mode........................................................................................................24
CHAPTER 5. FUNCTIONAL BLOCK DIAGRAM...............................................46
CHAPTER 6. MODBUS SIGNALS LIST..........................................................50
CHAPTER 7. PRODUCT SUPPORT AND SERVICE OPTIONS...........................58
Product Support Options ......................................................................................58
Product Service Options.......................................................................................58
Returning Equipment for Repair...........................................................................59
Replacement Parts ...............................................................................................59
Engineering Services............................................................................................60
Contacting Woodward’s Support Organization ....................................................60
Technical Assistance............................................................................................61

723PLUS Standard Generator Control LON Load Sharing Manual 91623
ii Woodward
Illustrations and Tables
Figure 5-1a. Functional Block Diagram 9971-4050..............................................47
Figure 5-1b. Functional Block Diagram 9971-4050..............................................48
Figure 5-1c. Functional Block Diagram 9971-4050 ..............................................49

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
Woodward iii
Warnings and Notices
Important 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.
Overspeed /
Overtemperature /
Overpressure
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.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage. Always
wear the appropriate personal protective equipment (PPE) for the job
at hand. Equipment that should be considered includes but is not
limited to:
Eye Protection
Hearing Protection
Hard Hat
Gloves
Safety Boots
Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
Start-up
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.
Automotive
Applications
On- and off-highway Mobile Applications: Unless Woodward's control
functions as the supervisory control, customer should install a
system totally independent of the prime mover control system that
monitors for supervisory control of engine (and takes appropriate
action if supervisory control is lost) to protect against loss of engine
control with possible personal injury, loss of life, or property damage.

723PLUS Standard Generator Control LON Load Sharing Manual 91623
iv Woodward
Battery Charging
Device
To prevent damage to a control system that uses an alternator or
battery-charging device, make sure the charging device is turned off
before disconnecting the battery from the system.
Electrostatic Discharge Awareness
Electrostatic
Precautions
Electronic controls contain static-sensitive parts. Observe the
following precautions to prevent damage to these parts:
Discharge body static before handling the control (with power to
the control turned off, contact a grounded surface and maintain
contact while handling the control).
Avoid all plastic, vinyl, and Styrofoam (except antistatic versions)
around printed circuit boards.
Do not touch the components or conductors on a printed circuit
board with your hands or with conductive devices.
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.
Follow these precautions when working with or near the control.
1. 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.
2. 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.

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
Woodward v
List of Abbreviations
This is a list of abbreviations and terminology used in this manual:
AGLC Automatic Generator Loading Control
ALM Alarm—a warning signal
CB Circuit Breaker
CPU Central Processing Unit
DCS Digital Control System
GCB Generator Circuit Breaker
HSS Depends on the context:
—High speed shaft of the gearbox
—High signal selector in software
kVar Reactive Power
kW Kilowatts
LED Light Emitting Diode
LON Woodward Local Operator Network
LOP Local Operator Panel
LS Load Sharing
LSL Load Sharing Lines
LSS Depends on the context:
—Low speed shaft of the gearbox
—Low signal selector in software
MPU Magnetic Pick-up sensor
MSB Main Switch Board
mA Milliamps
mV Millivolts
NC Normally Closed
NO Normally Open
PC Personal Computer
PCB Printed Circuit Board
PID Proportional Integration Derivative
PLC Programmable Logic Controller
PS Port Side
PSU Power Supply Unit
PTO Power Take Off
rpm Revolutions per Minute (can also be expressed as “1/s”)
RPS Real Power Sensor
SD Shutdown
SB Starboard
SPM-A Woodward Synchronizer Power Management Analog
TB Terminal Block
TBR Tie Breaker
UPCI Universal PC Interface
Vac Volts (alternating current)
Vdc Volts (direct current)

723PLUS Standard Generator Control LON Load Sharing Manual 91623
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Manual 91623 723PLUS Standard Generator Control LON Load Sharing
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Chapter 1.
General Information
Introduction
The Woodward part numbers belonging to the “Standard Generator Control LON
Load Sharing” are the following:
System: 8280-1099
Hardware: 723PLUS Low Voltage: 9906-619
Application software: 9927-1680
The following drawings belong to the system:
Functional block diagram: 9971-4050
The Woodward “Standard Generator Control LON Load Sharing” has the
following functionality:
Speed control (isochronous & droop)
Load sharing control (via LON communication network), with up to 2
interconnect tie-breakers (3 bus-segments)
Load sharing control (via legacy Load-Sharing lines)
Features:
Configurable I/O ranges and assignment to I/O channels
Multi dynamics
Generator breaker & Speed derivative load rejection
Charge air pressure fuel limiter
Start fuel limiter
Remote base-load setpoint
SERVICE and CONFIGURE Menus for tuning and monitoring Hand Held
Programmer (723PLUS serial port J1), Watch Window, and Servlink
(723PLUS serial port J2, J1)
Test/Override functionality for I/O signals
Modbus® * communication available with extensive list of signals (723PLUS
serial port J3)
Communications are prepared for possible future graphic HMI software
(723PLUS serial port J2), for instance Woodward Toolkit.
*—Modbus is a trademark of Schneider Automation Inc.
Associated Publications
The following publications contain additional product or installation information on
Load Sharing and Speed Controls, and related components. These can be
downloaded with the following link: www.woodward.com/publications.
Manual 02877, 723PLUS Digital Control Hardware
Manual 25070, Electronic Governor Installation Guide
Manual 26260, Governing Fundamentals and Power Management
Manual 82715, Guide for Handling and Protection of Electronic Controls, Printed
Circuit Boards, and Modules
Product Specification 03202, Woodward Watch Window Standard
Application Note 83402, PID Control
TSP 14246, Standard Generator Control LON Load Sharing

723PLUS Standard Generator Control LON Load Sharing Manual 91623
2 Woodward
Chapter 2.
Inputs and Outputs
Speed Sensor Inputs
The following analog input signals have been defined for this control:
Engine Speed-Sensor Input #1
Engine Speed-Sensor Input #2
These speed sensor inputs can be either passive (MPU) or active (PROXIMITY);
The respective jumpers on the 723PLUS shall be set accordingly, see manual
02877.
Using the CONFIGURE Menu, the number of teeth for these inputs can be
adjusted. Also the speed sensing strategy can be chosen, like HSS selection,
Torsional Filtering, Master/Slave.
Analog Inputs
The following analog input signals have been defined for this control:
Remote Speed Setpoint (4–20 mA)
Synchronizer Speed Bias (–5 V ~ +5 V)
Charge Air pressure (4–20 mA)
Generator Load input (4–20 mA)
Load Limiter input (4–20 mA)
Remote Base-load Setpoint (4–20 mA)
Reactive Power input
Fuel Limiter input (4–20 mA)
Using the CONFIGURE Menu, these inputs can be enabled/disabled and
assigned to any of the 4 analog inputs available on the 723PLUS. It is also
possible to map these analog inputs to Modbus addresses, so they can be sent
from an external PLC or DCS system.
Most of these signals can be configured for minor or major alarms when the
signals fails (goes out of range).
Remote Speed Setpoint (4–20 mA)
The remote speed reference will be activated when both the Raise Speed and
the Lower Speed contact inputs are closed, and it needs to be enabled in the
DEBUG mode. Currently, this control feature is not used.
Synchronizer Speed Bias (–5 V ~ +5 V)
The synchronizer speed bias input is a bi-polar voltage input. The Woodward
SPM-A synchronizer makes a suitable match for this control feature.
The voltage will be scaled into a bi-polar speed bias (rpm), with a corresponding
“Synchronizer Gain” setting in the SERVICE Menus.
By default the “Synchronizer Gain” is 1.0 and the bias range is ±2% of rated
speed reference.

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
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Charge Air Pressure (4–20 mA)
The Charge Air Pressure (Boost pressure) input allows for a fuel limiter based on
this pressure, to prevent overfueling and therefore smoke.
This fuel limiter is a multi-point curve, which can be adjusted in the SERVICE
Menus.
Generator Load Input (4–20 mA)
The Generator Load must be a real power measurement input. The Woodward
RPS is a suitable choice for this control input.
The generator load input is used extensively in the control for load sharing and
droop operation.
Load Limiter Input (4–20 mA)
The Load Limiter input will define an active maximum when operating in load
control only. It is not used in speed control or droop operation.
Remote Base-Load Setpoint (4–20 mA)
The Remote Base-Load Setpoint will define the load reference when operating in
base-load control only. It is not used in speed control or droop operation.
The base-load control mode is activated when the control is in load control mode
and both the Raise Load and the Lower Load contact inputs are closed.
Reactive Power Input (4–20 mA)
The Reactive Power input can be monitored in the SERVICE Menus, and is sent
over Modbus and can be output on an analog output channel.
Fuel Limiter Input (4–20 mA)
The Fuel Limiter input will define an active fuel maximum, which is always active.
Analog Outputs
The following analog signals can be output on this control:
Control PID out
Control LSS out
Control Actuator out
Final Speed Reference
Load Reference
Selected Speed
Speed Sensor #1
Speed Sensor #2
Remote Speed Reference
Synchronizer Bias
Charge Air Pressure
Load
Load Limiter
Remote Base-Load Reference
Reactive Power
Fuel Limiter
Average Load on this engine’s bus segment(s)
Total Load-Sharing Load on all bus segments
Total Load on all bus segments

723PLUS Standard Generator Control LON Load Sharing Manual 91623
4 Woodward
Using the CONFIGURE Menu, these signals can be assigned to any of the 4
analog outputs available on the 723PLUS.
These analog signals are also available on the Modbus address list.
Control PID Out
This outputs the speed control’s PID value [%].
Control LSS Out
This outputs the speed control’s LSS value [%], which in non-limited steady state
operation will be the same as the speed control’s PID value.
Control Actuator Out
This outputs the speed control’s Actuator output signal [%].
Final Speed Reference
This outputs the final speed reference [rpm]. This value is the main speed
reference ramp, with all biases applied to it, like droop bias, synchronizer bias,
load sharing control bias.
Load Reference
This outputs the main load reference ramp [%]. When not in load-sharing mode,
this ramp will follow the actual load input.
Selected Speed
This outputs the selected speed value [rpm], which is used throughout this speed
control system.
Speed Sensor #1
This outputs speed sensor #1 [rpm].
Speed Sensor #2
This outputs speed sensor #2 [rpm].
Remote Speed Reference
This copies and outputs the remote speed setpoint [rpm] input.
Synchronizer Bias
This copies and outputs the Synchronizer Bias [rpm] input.
Charge Air Pressure
This copies and outputs the Charge Air Pressure [bar] input.
Load
This copies and outputs the Generator Load input [%] or the calculated load
(actuator position) when the input failed.
Load Limiter
This copies and outputs the Load Limiter [%] input
Remote Base-Load Reference
This copies and outputs the Remote Base-Load [%] input.
Reactive Power
This copies and outputs the Reactive Power [kVar] input.

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
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Fuel Limiter
This copies and outputs the Fuel Limiter [%] input.
Average Load on This Engine’s Bus Segment(s)
This outputs the average Load [%] on the bus segment for which this control has
been defined on.
Total Load-Sharing Load on All Bus Segments
This outputs the total Load [%] of all engines participating in Load-Sharing mode
on the 3 bus segments.
Total Load on All Bus Segments
This outputs the total Load [%] of all engines on all 3 bus segments, impendent
of their operation mode.
Discrete Inputs
The following discrete input signals have been defined for this control:
Reset
Run
Stop
Raise Speed
Lower Speed
Raise Load
Lower Load
Unload
Base-Load
Remote Speed

Droop
Isochronous
Idle
Rated
GCB closed
TBR #1 closed
TBR #2 closed
LON Reset command
Dynamics #2 select
Dynamics #3 select
Using the CONFIGURE Menu, these inputs can be enabled and assigned to any
of the 8 discrete inputs available on the 723PLUS. It is also possible to map
these digital inputs to Modbus addresses, so they can be sent from an external
PLC or DCS system.
Each digital input can be set as close or open for action, so it is possible to map
Run and Stop to the same contact input channel, one with open for action, and
the other with close for action.
Reset
The reset can be used to reset Minor and Major Alarms. “Software Reset” from
the SERVICE Menus performs the same function.
Run
Starts the engine if no Major Alarms are active.
Stop
Stops the engine, and overrides the Run action if selected.
Raise Speed
Raises the speed reference ramp. Active in Speed Control mode when above
Idle speed. It overrides the Rated Speed feature.
Lower Speed
Raises the speed reference ramp. Active in Speed Control mode when above
Idle speed. It overrides the Rated Speed feature.

723PLUS Standard Generator Control LON Load Sharing Manual 91623
6 Woodward
Raise Load
Raises the load reference ramp. Active in Load Control mode and needs to be
enabled in DEBUG mode. Currently, this control feature is not used.
Lower Load
Raises the load reference ramp. Active in Load Control mode and needs to be
enabled in DEBUG mode. Currently, this control feature is not used.
Unload
Ramps the load reference ramp down to the Unload Setpoint with the Unload
rate. Active in Load Control mode and overrides Base-Load or Load-Sharing
mode.
Base-Load
The load reference ramp will follow the Remote Base-Load input. Active in Load
Control mode.
This same function can also be enabled by closing both the Raise Load and
Lower Load inputs.
Remote Speed
The speed reference ramp will follow the Remote Speed input. Active in Speed
Control mode.
The same function can also be enabled by closing both the Raise Speed and
Lower Speed inputs.
Droop
Droop mode selects Speed Control mode, and when the GCB is closed, it will
apply a negative droop bias [rpm] based on the Load input.
If the Load input fails, the load will be calculated on actuator position; known as
actuator droop. In the Service Menu the No Load and Full Load actuator
positions need to be set correctly.
Isochronous
Isochronous mode selects Load Control mode when the GCB is closed. When a
LON fault occurs, the control switches to Speed Control mode and Droop mode,
even though this contact is closed.
Idle
Selects Idle speed when the GCB is open.
Rated
Selects Rated speed when the GCB is open.
GCB Closed
Feedback of the generator circuit breaker status. This signal must be as fast as
possible for best load rejection performance.
TBR #1 Closed
Feedback of the tie-breaker #1 status.
TBR #2 Closed
Feedback of the tie-breaker #2 status.

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
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LON Reset Command
Reset command for latched LON communication errors.
Dynamics #2 Select
This will select the dynamics set #2 for the PID speed control. It will override
dynamics set #1, which is default.
Dynamics #3 Select
This will select the dynamics set #3 for the PID speed control. It will override
dynamics set #2 and dynamics set #1 (which is default).
Relay Driver Outputs / LED driver Outputs
The following discrete signals can be output on this control:
Minor Alarm
Major Alarm
Minor or Major Alarm
Any I/O in Test/Override
Analog Input #1 fault
Analog Input #2 fault
Analog Input #3 fault
Analog Input #4 fault
GCB closed
TBR #1 closed
TBR #2 closed
Isochronous
Speed control

Base-Load control
Load-Sharing control
Load >=Limit
Unloaded
Stopped
Speed >= Idle
Speed >= Rated
Speed >= Setpoint #1
Speed >= Setpoint #2
Any LON fault
Speed sensor #1 fault
Speed sensor #2 fault
Using the CONFIGURE Menu, these signals can be assigned to any of the 3
discrete outputs and/or any of the 4 LED’s available on the 723PLUS.
Minor Alarm
This signal indicates a Minor Alarm is active. A Reset command might reset this,
unless the cause of this Minor Alarm persists.
Major Alarm
This signal indicates a Major Alarm is active. A Reset command might reset this,
unless the cause of this Major Alarm persists.
Minor or Major Alarm
This signal indicates a Minor or Major Alarm is active. A Reset command might
reset this, unless the cause of this this Minor Major Alarm persists.
Any I/O in Test/Override
This signal indicates that any of the input or output signals has been forced
manually to a test value using the SERVICE Menu.
Analog Input #1~4 Fault
These signals indicate an out-of-range failure (wire break) for analog input #1~4.
GCB Closed
Feedback of the generator circuit breaker status.
TBR #1 Closed
Feedback of the tie-breaker #1 status.

723PLUS Standard Generator Control LON Load Sharing Manual 91623
8 Woodward
TBR #2 Closed
Feedback of the tie-breaker #2 status.
Isochronous
Isochronous control mode is active.
Speed Control
Speed control mode is active.
Base-Load Control
Base-Load control mode is active.
Load-Sharing Control
Load-Sharing control mode is active.
Unloaded
Load reference ramp <=unload setpoint.
Stopped
Engine speed < stop speed setpoint
Speed > Setpoint # X
Engine speed >= respective setpoint
Any LON fault
Indicates any LON network communication failure (latched).
Speed Sensor #X Fault
Indicates a speed sensor failure (latched).

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
Woodward 9
Chapter 3.
Description of Operation
Introduction
This chapter provides an overview of the features and operation of this 723PLUS
control system.
The control defines 2 major operational modes:
Speed control
Load control
Within Load control, there are 3 sub modes:
Base-Load control
Load-Sharing control
Unload mode
Speed Control
Speed control is active when the GCB is open, or when the Droop contact input
is selected, or when any LON fault is present.
In this mode the Raise Speed and Lower Speed contacts can be used to change
the main speed reference ramp. When the GCB is closed in this mode, the
Speed Raise and Lower contacts will change the load as well, bus frequency
shall be maintained by the operator or external DCS system.
When the GCB is closed, Droop will be based on the load sensor input. When
the load sensor input fails or is not connected, droop will be based on an actuator
based calculated load instead.
Load Control
Load control is active when the GCB is closed, the Isochronous contact is
selected. In case of LON load-sharing, all LON communications need to be OK
as well. When using the load-sharing lines (LSL) on the 723PLUS, the LON
communication doesn’t need to be used.
When the load sensor input fails, is not connected or is not configured, the
control can go to droop or stay in Load Control, and will revert to an actuator
based calculated load instead. This can be configured in the Service Menu’s.
Base-Load Control
Load control is active when the GCB is closed, and the Isochronous contact is
selected, and all LON communications are OK (not using the LSL) and the Base-
Load contact is closed or both Raise & Lower Load are closed.
The Load reference ramp will follow the Remote Base-Load setpoint input until
either the Unload setpoint is reached or any of the Load-Limits have been
reached.

723PLUS Standard Generator Control LON Load Sharing Manual 91623
10 Woodward
Load-Sharing Control (LON)
Load control is active when the GCB is closed, the Isochronous contact is
selected, and all LON communications are OK and no Base-Load or Unload
control modes have been selected.
The Load setpoint will be updated continuously, calculating the average load of
this engine and the others (also in LS mode) on the same bus-segment(s).
When an engine wants to go into LS mode after closing its GCB, the engine will
soft-load to the LS average setpoint. When the LS average setpoint has been
reached, it will fully participate in LS mode, that is, let the others engine controls
know. If this was the first unit in LS mode on this bus-segment, soft-loading will
be reset immediately.
When an engine is running in LS mode, and one of the TBR’s closes, all units on
the connecting bus segments will start to soft-load to the new calculated LS
average, which is now based on multiple bus-segments.
Load-Sharing Control (LSL)
For downward compatibility with legacy Woodward controls, one can configure
this control to operate in load sharing mode using the Woodward Load Sharing
Lines (LSL).
The LSL's shall be daisy chained from each engine control to an other.
The LON configuration shall be setup as a single engine only with NODE ID=1,
all other NODEs shall have BUS ID of 0 and the LON network cabling shall not
be connected.
External relays shall be used to connect LSL's of different bus segments together
when an interconnect Tie Breaker closes.
Load-Sharing lines and LON load-sharing cannot be mixed together
on the same bus networks. Select either LS mode for all 723PLUS
engine controls.
Unload Control
Unload control is active when the GCB is closed, the Isochronous contact is
selected, and all LON communications are OK and the Unload contact is closed.
The Load reference ramp will ramp down to the Unload setpoint. When this has
been reached, it will stay at this load setpoint until either the Unload is
deactivated or the GCB is opened.
Speed Sensing
The 723PLUS control has two speed sensor inputs, either MPU or Proximity
type.
For each sensor, the #teeth and filtering can be adjusted in the SERVICE Menus.

Manual 91623 723PLUS Standard Generator Control LON Load Sharing
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Minor/major alarm can be selected for each sensor and for the speed difference
becoming too high between both sensors.
One or two sensors can be used in this control, and the possible speed sensing
strategies are:
HSS selection
Torsional Filtering
Master/Slave
HSS selection is active when only one sensor is used, or one of the two sensors
has failed. The selected speed is the highest of the two speed sensor inputs.
Torsional Filtering requires two speed sensor inputs that are OK. A Torsional
percentage [α] can be adjusted from 0 to 100%. The validated speed will be:
Speed  α Speed#1
100% 󰇛1α
󰇜Speed#2
100%
The Master/Slave speed sensing strategy defines Speed#1 as the Master speed
sensor. When this sensor fails, the control switches to Speed#2. When the speed
difference between both sensors is too high (adjustable threshold), then the
control switches to conventional HSS speed selection.
Start Sequence & Start Fuel Limiter
The start sequence is activated when there are no major alarms, and the Start
contact is closed. The Speed Reference will ramp to the Idle speed setpoint.
When not using the Idle/Rated contacts, one can use the automatic startup to
Rated speed feature. When Idle speed has been reached and speed control is
stable, the control will automatically ramp up to rated speed after an adjustable
time. Whenever a Speed Raise or Lower command is issued during this
sequence, the automatic startup will be aborted.
When the Idle / Rated contacts have been configured, these will select between
Idle and Rated speed setpoint. Do not configure the automatic startup to rated in
this case.
During starting to Idle speed, a start-up fuel limiter is active. This start fuel limiter
can limit the amount of overfueling the engine, therefore reducing excessive
smoke. Setting the start fuel limiter curve too tight can result in failed starts. It is
advised to adjust the points on this curve for a cold engine under coldest ambient
conditions.
The start-fuel limiter is deactivated when Idle speed has been reached and the
engine speed control is stable (does not jump into any limiter) for a few seconds.
This prevents ramping on to rated speed if dynamic proportional gain is too high
for example.
When the start-sequence is initiated, a startup timer is started. When this timer
expires, the speed override is removed from both speed sensors. When speed is
still below the minimum speed threshold, a major alarm will shutdown the engine,
indicating this startup attempt has failed.

723PLUS Standard Generator Control LON Load Sharing Manual 91623
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Synchronizing
Synchronizing to a (local) grid or one bus segment to another can be
accomplished by connecting a bi-polar voltage from a synchronizer to the correct
723PLUS control input channel.
Note that one has to check the correct jumper settings on the 723PLUS control
for voltage or current input. The ±5 Vdc from the synchronizer normally result in a
speed bias of ±2% of rated speed setpoint.
A synchronizer gain can be adjusted in from the SERVICE Menu for stability or
speed.
Fuel Limiters
There are several fuel limiters in this control that either protect against
overloading or overfueling:
Max Actuator
Start Fuel Limiter
Fuel Limiter input
Charge Air pressure fuel limiter
Jump & Rate limiter
Load Limiter input
The Max Actuator limit can be set in the SERVICE Menu. When not using it, set it
out of the way, that is at 100%
The Start Fuel Limiter is a 4-point curve based on speed input. This limiter is only
active during startup to Idle speed setpoint.
The Fuel limiter input is an analog input from either hardware or Modbus. When
not using it, configure this input as not used and set the default value out of the
way, that is to 100%
The Charge air pressure fuel limiter is a 4-point curve based on Charge air
pressure as input. This limiter is only active when the GCB is closed and the
Charge air pressure signal is ok.
The Jump & Rate limiter can be used to limit the amount of over-fueling of the
engine during positive load transients. The limiter can be enabled from the
SERVICE Menu, and both the jump level and rate limits are adjustable. The
Jump & Rate limiter is only active after the startup to Idle has finished, otherwise
it could interfere during startup, resulting in failed starts.
The Load limiter input is not a true fuel limiter, since it does not operate on the
LSS bus directly. It limits the Load reference ramp, and therefore is only active in
Load control mode. There is also a Load limiter setpoint, adjustable from the
SERVICE Menu.