Woodward 2301D User manual

Product Manual 26247
(Revision C)
Original Instructions
2301D and 2301D-EC Digital Load Sharing
and Speed Controls for Engines
Ordinary Locations Hazardous Locations
2301D 8273-140 8273-141
2301D-EC 8273-138 8273-139
Installation and Operation Manual

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 or updated since this copy was produced. To verify that
you have the latest revision, be sure to check the publications page on the Woodward website:
www.woodward.com/publications
The current revision and distribution restriction of all publications are shown in manual 26311.
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.
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.
Revisions—Text changes 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 2003
All Rights Reserved

Manual 26247 2301D/2301D-EC Digital Control
Woodward i
Contents
REGULATORY COMPLIANCE ........................................................................V
ELECTROSTATIC DISCHARGE AWARENESS ................................................. VI
CHAPTER 1. GENERAL INFORMATION...........................................................1
Description..............................................................................................................1
Applications ............................................................................................................2
Control Options.......................................................................................................3
References .............................................................................................................3
CHAPTER 2. INSTALLATION..........................................................................9
Introduction.............................................................................................................9
Unpacking...............................................................................................................9
Power Requirements..............................................................................................9
Location Considerations.........................................................................................9
Electrical Connections..........................................................................................10
Shields and Grounding.........................................................................................10
Setting Speed Range ...........................................................................................11
Potential Transformer Connections......................................................................11
Current Transformer Connections........................................................................11
Load Sharing Lines...............................................................................................12
Power Supply .......................................................................................................12
Discrete Inputs (Terminals 28–38).......................................................................13
Close to Run or Minimum Fuel (Terminal 31) ......................................................13
Digital Inputs B, C, D (Terminals 32, 33, 34)........................................................14
Failed Speed Override..........................................................................................14
Reset ....................................................................................................................14
Select 2nd Dynamics.............................................................................................15
Shutdown Internal.................................................................................................15
Shutdown External ...............................................................................................15
Rated Speed.........................................................................................................15
Idle/Rated Software Switch ..................................................................................16
CB Aux/Droop Contact.........................................................................................16
Raise Speed/Load Contact (Terminal 35)............................................................17
Lower Speed/Load Contact (Terminal 36) ...........................................................17
Load Generator (Terminal 37)..............................................................................18
Base Load (Terminal 38)......................................................................................18
Actuator Output ....................................................................................................18
Analog Inputs........................................................................................................18
Analog Input #1 (Terminals 19-20).......................................................................19
Analog Input #2 (Terminals 22-23).......................................................................20
Speed Sensor (Terminals 25-26).........................................................................20
Relay Driver Outputs (Terminals 41–44)..............................................................20
Analog Output #1 (Terminals 16-17)....................................................................21
Communication Port.............................................................................................21
Installation Check-out Procedure.........................................................................25
CHAPTER 3. ENTERING CONTROL SET POINTS...........................................26
Introduction...........................................................................................................26
Watch Window PC Interface.................................................................................26
Configure Menu Descriptions...............................................................................28
Service Menu Descriptions...................................................................................34

2301D/2301D-EC Digital Control Manual 26247
ii Woodward
Contents
CHAPTER 4. INITIAL CONTROL SETTINGS....................................................64
Initial Prestart Settings..........................................................................................64
Start-up Adjustments............................................................................................64
Adjust for Stable Operation ..................................................................................65
Speed Setting Adjustment....................................................................................65
Dynamic Adjustment.............................................................................................66
Actuator Compensation Adjustment.....................................................................66
Ramp Time Adjustment........................................................................................66
Raise/Lower Time Adjustment..............................................................................66
Start Fuel Limit Adjustment ..................................................................................67
Speed Sensor Check............................................................................................67
Current Transformer (CT) Phasing Check ...........................................................67
Phase Correction Procedure................................................................................68
Load Calibration Adjustment ................................................................................71
Droop Adjustment.................................................................................................71
CHAPTER 5. ALTERNATIVE DYNAMIC ADJUSTMENTS ..................................72
Introduction...........................................................................................................72
Adjustment............................................................................................................72
CHAPTER 6. DESCRIPTION OF OPERATION..................................................77
Introduction...........................................................................................................77
Speed Control.......................................................................................................77
Control Dynamics .................................................................................................78
Minimum Fuel Function........................................................................................79
Maximum Fuel Function.......................................................................................80
Start Limit Function...............................................................................................80
Torque Limiter.......................................................................................................80
Manifold Air Pressure Limiter ...............................................................................81
Speed/Load Reference and Ramps.....................................................................81
Speed Reference and Ramp Functions...............................................................81
Speed Bias and Synchronizer Summing..............................................................83
Load Reference and Ramp Functions..................................................................83
Droop Function.....................................................................................................85
Droop/Isochronous Load Sharing on an Isolated Bus..........................................88
Isochronous Load Sharing on an Isolated Bus.....................................................89
Actuator Droop......................................................................................................90
Loadpulse / Load Rejection..................................................................................90
CHAPTER 7. TROUBLESHOOTING ...............................................................91
Introduction...........................................................................................................91
Troubleshooting Procedure..................................................................................91
Control Start-up ....................................................................................................91
Control Test and Calibration.................................................................................92
Troubleshooting Charts........................................................................................93
CHAPTER 8. COMMUNICATIONS..................................................................99
Modbus Communication.......................................................................................99
Monitor Only .........................................................................................................99
Monitor And Control..............................................................................................99
Modbus Communication Mode...........................................................................100
Modbus Function Codes.....................................................................................101

Manual 26247 2301D/2301D-EC Digital Control
Woodward iii
Contents
Port Adjustments................................................................................................101
2301D Control Modbus Addresses ....................................................................102
Modbus Scale Factors........................................................................................103
Shutdown Command through Modbus...............................................................103
Start Command Through Modbus......................................................................104
For More Modbus Information............................................................................104
CHAPTER 9. PRODUCT SUPPORT AND SERVICE OPTIONS.........................105
Product Support Options....................................................................................105
Product Service Options.....................................................................................105
Returning Equipment for Repair.........................................................................106
Replacement Parts.............................................................................................106
Engineering Services..........................................................................................107
Contacting Woodward’s Support Organization ..................................................107
Technical Assistance..........................................................................................108
APPENDIX A. SERVICE/CONFIGURATION CHART.......................................109
Configure Menus................................................................................................109
Service Menus....................................................................................................110
APPENDIX B. MODBUS COMMUNICATION LIST..........................................116
2301D /2301D-EC CONTROL SPECIFICATIONS.......................................120
DECLARATIONS.......................................................................................121

2301D/2301D-EC Digital Control Manual 26247
iv Woodward
Illustrations and Tables
Figure 1-1a. 2301D Outline Drawing (Ordinary Locations)....................................4
Figure 1-1b. 2301D Outline Drawing (Hazardous Locations) ................................5
Figure 1-2a. 2301D Plant Wiring Diagram (sheet 1)..............................................6
Figure 1-2b. 2301D Plant Wiring Diagram (sheet 2)..............................................7
Figure 1-2c. 2301D Plant Wiring Diagram (notes) .................................................8
Figure 2-1. Installation of Wiring into Terminal.....................................................11
Figure 2-2. Droop Contact and Circuit Breaker Auxiliary Contact........................16
Figure 2-3. RS232 Pin assignments for Serial Communication Cable.................22
Figure 2-4. Typical RS422 Communications Connections...................................22
Figure 2-5. RS-422 Terminator Locations............................................................23
Figure 2-6. Preferred Multipoint Wiring Using Shielded Twisted-pair Cable with a
Separate Signal Ground Wire..........................................................24
Figure 2-7. Alternate Multipoint Wiring Using Shielded Twisted-pair Cable without
a Separate Signal Ground Wire.......................................................24
Figure 3-1. Null Modem Cable..............................................................................27
Figure 3-2. Control Gain as a Function of Speed Error........................................40
Figure 3-3. Speed Filter........................................................................................41
Figure 3-4. Typical Transient Response Curves..................................................43
Figure 3-5. Non-linear Valve Power Curve...........................................................47
Figure 3-6. Non-linear Valve Power Curve for Turbocharged Engine..................47
Figure 3-7. Linearized Gain Plot...........................................................................48
Figure 3-8. Start Limit Function............................................................................50
Figure 3-9. LP Ramp............................................................................................61
Figure 4-1. Temporary Wiring for Transformer Phase Correction........................69
Figure 4-2. Droop Adjustment ..............................................................................71
Figure 5-1. Trend Tool Trace Example 1 .............................................................73
Figure 5-2. Trend Tool Trace Example 2 .............................................................74
Figure 5-3. Trend Tool Trace Example 3 .............................................................74
Figure 5-4. Trend Tool Trace Example 4 .............................................................75
Figure 5-5. Trend Tool Trace Example 5 .............................................................75
Figure 5-6. Trend Tool Trace Example 6 .............................................................75
Figure 6-1. Speed Control System.......................................................................78
Figure 6-2. Start Limit Function............................................................................80
Figure 6-3. Remote Speed Reference .................................................................82
Figure 6-4. Paralleling System .............................................................................86
Figure 6-5. Droop Mode .......................................................................................87
Figure 6-6. Isochronous Mode..............................................................................88
Figure 6-7. Droop/Isochronous Load Sharing......................................................89
Figure 6-8. Isochronous Load Sharing.................................................................89
Table 3-1. Communication Error Code.................................................................62
Table 5-1. Description of Discrete Inputs While in Load Control..........................85
Table 7-1. RTU Modbus.....................................................................................100
Table 7-2. Modbus Frame Definition..................................................................100
Table 7-3. Modbus Function Codes ...................................................................101
Table 7-4. Port Adjustments...............................................................................101

Manual 26247 2301D/2301D-EC Digital Control
Woodward v
Regulatory Compliance
European Compliance for CE Mark
These listings are limited only to those units bearing the CE Marking.
EMC Directive: Declared to 89/336/EEC COUNCIL DIRECTIVE of
03 May 1989 on the approximation of the laws of the
member states relating to electromagnetic
compatibility.
Low Voltage Directive: Declared to the 73/23/EEC COUNCIL DIRECTIVE of
19 February 1973 on the harmonization of the laws
of the Member States relating to electrical
equipment designed for use within certain voltage
limits.
North American Compliance
These listings are limited only to those units bearing the appropriate CSA
identification and marking.
CSA: CSA Certified for Class I, Division 2, Groups A, B, C,
D, T4 Hazardous Locations and ordinary locations at
70 °C ambient. For use in Canada and the United
States.
Certificate 1150575
NOTE—Wiring must be in accordance with applicable electric codes with the
authority having jurisdiction.
Marine Compliance
Bureau Veritas: BV Rules Part C, June 2000
Det Norske Veritas: Standard for Certification, No. 2.4.2001
Germanischer Lloyd: Additional Rules and Guidelines, Part 1,
2001
Lloyd’s Register of Shipping: Type Approval System, Test Specification
Number 1, 2002
Registro Italiano Navale: RINA Rules 2001 – Part C
NOTE—Marine certifications apply to specific models only.
Connector J1 must not be used in hazardous locations.
The control must be installed in a suitable enclosure. The final combination must
be approved by the local authority having jurisdiction.
Connect the ground terminal to earth ground.
EXPLOSION HAZARD—Do not remove covers or connect/disconnect
electrical connectors unless power has been switched off or the area
is known to be non-hazardous.
Substitution of components may impair suitability for Class I,
Division 2.
RISQUE D’EXPLOSION—Ne pas enlever les couvercles, ni
raccorder / débrancher les prises électriques, sans vous en
assurez auparavant que le système a bien été mis hors tension;
ou que vous vous situez bien dans une zone non explosive.
La substitution de composants peut rendre ce matériel
inacceptable pour les emplacements de Classe I, Division 2.

2301D/2301D-EC Digital Control Manual 26247
vi Woodward
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 26247 2301D/2301D-EC Digital Control
Woodward 1
Chapter 1.
General Information
Description
The Woodward 2301D controls load sharing and speed of generators driven by
diesel or gaseous engines. (These power sources are referred to as “prime
movers” throughout this manual.) The 2301D is a microprocessor-based digital
control designed to include the functions of and be compatible with 2301A load
sharing controls. The increased flexibility of software allows the 2301D to include
control functions that required additional equipment in previous versions of
2301A control systems. The 2301D therefore is suitable for upgrading existing
control systems or increased functionality in new installations.
The 2301D has the following Woodward part numbers:
8273-138 2301D-EC Load Sharing and Speed Control, 24 Vdc input, with
Modbus® *, Ordinary Locations
8273-139 2301D-EC Load Sharing and Speed Control, 24 Vdc input, with
Modbus, Hazardous Locations
8273-140 2301D Load Sharing and Speed Control, 24 Vdc input, Ordinary
Locations
8273-141 2301D Load Sharing and Speed Control, 24 Vdc input, Hazardous
Locations
*—Modbus is a registered trademark of Schneider Automation Inc.
The control is housed in a sheet-metal chassis and consists of a single printed
circuit board. The 2301D is set up and configured through an external computer
connected at the 9-pin connector at the front of the control. The configuration
software is supplied with each control.
The 2301D provides control in either isochronous, droop, or base load. The
2301D will allow for soft load transfer when being added to or removed from a
bus.
The isochronous mode is used for constant prime mover speed with:
Single prime mover operation or
Two or more prime movers controlled by Woodward load sharing control
systems on an isolated bus
The droop mode is used for speed control as a function of load with:
Single prime mover operation on an infinite bus or
Parallel operation of two or more prime movers
The base load mode provides constant load level operation against a bus with
the load controlled by the 2301D.
The load setting is set by a fixed reference,
or an external analog input,
or external contact control of the reference.

2301D/2301D-EC Digital Control Manual 26247
2 Woodward
The 2301D Control Hardware includes:
1 Load Sensor
1 Actuator Driver
1 MPU Speed Sensor
1 Configurable Analog Output
2 Configurable Analog Inputs
8 Discrete (Switch) Inputs (3 inputs are configurable)
4 Configurable Discrete (Relay Driver) Outputs
The following is an example of the typical hardware needed for a 2301D system
controlling a single prime mover and generator:
A 2301D electronic control
An external 18 to 40 Vdc power source
A speed-sensing device
A proportional actuator to position the fuel-metering device and
Current and potential transformers for measuring the load carried by the
generator
The engine and generator synchronous speed (50 or 60 Hz Generator
Frequency) needs to be within 300 to 3600 rpm. The frequency from the
magnetic pickup must be within the range of 100 to 20 000 Hz at rated speed.
The 2301D speed range needs to be configured using an external computer
during installation.
These 2301D controls operate with an input of 18 to 40 Vdc.
Applications
Because of the configuration software available in the 2301D hardware,
application variations can now be selected using an external computer. Changing
the application to accommodate engine speed range, gear teeth, and selection of
forward or reverse acting actuator is a matter of software setup rather than
changing hardware. See Chapter 4 to enter control set points.
The speed range is factory set for 900 rpm, 900 Hz. Using the wrong
speed configuration could cause an overspeed with resulting
damage to equipment or personal injury or death.
The 2301D Control can be configured for forward- or reverse-acting applications.
In reverse-acting systems, the actuator calls for more fuel when the actuator
voltage decreases. Complete loss of voltage to the actuator will drive the actuator
to full fuel. This allows a backup mechanical ballhead governor to take control
rather than shut down the prime mover as would a direct-acting system.
External wiring connections for reverse-acting controls are identical
to those for direct-acting controls.

Manual 26247 2301D/2301D-EC Digital Control
Woodward 3
Control Options
Here is a brief summary of programmable options in addition to speed range and
actuator type:
Actuator current range 0–20 mA, 4–20 mA, 0–200 mA.
Speed trim with external raise and lower switches. Tunable rates.
External setting of analog speed reference input or an external analog base
load reference.
Multiple dynamics options—
single dynamics setting
selection of 2 sets of dynamics switched with Circuit Breaker Aux input
5 slope gain settings
error window gain ratio
Start fuel limiter / Manifold Air Pressure limiter
Analog output
Discrete outputs
Woodward application engineers are always available to assist you in selection
of the correct control for your system, or to answer questions concerning control
installation, operation, or calibration. Contact any Woodward office.
References
The following publications contain additional product or installation information on
Load Sharing and Speed Controls, and related components. They can be
obtained at www.woodward.com/publications.
Manual Title
25070 Electric Governor Installation Guide
25195 Governing Fundamentals
82384 SPM-A Synchronizer
82510 Magnetic Pickups and Proximity Switches for Electric Governors
82715 Guide for Handling and Protection of Electronic Controls, Printed
Circuit Boards, and Modules
26007 Woodward Watch Window Software Getting Started
Product
Spec Title
03204 2301D Digital 2301 Control
82383 SPM-A Synchronizer
82516 EG3P/3PC Actuator
82575 EGB1P/2P Governor/Actuator

2301D/2301D-EC Digital Control Manual 26247
4 Woodward
Figure 1-1a. 2301D Outline Drawing (Ordinary Locations)

Manual 26247 2301D/2301D-EC Digital Control
Woodward 5
Figure 1-1b. 2301D Outline Drawing (Hazardous Locations)

2301D/2301D-EC Digital Control Manual 26247
6 Woodward
Figure 1-2a. 2301D Plant Wiring Diagram (sheet 1)

Manual 26247 2301D/2301D-EC Digital Control
Woodward 7
18-40 Vdc EXTERNAL POWER
SUPPLY INPUT
(100 mA MAX AT 24 Vdc)
DISCRETE INPUTS
NOT USED WHEN USING
EXTERNAL POWER SUPPLY
DISCRETE INPUTS WITH EXTERNAL POWER SUPPLY
MINIMUM FUEL, CLOSE TO RUN
CONFIGURABLE (IDLE / RATED)
DISCRETE INPUTS
24 VDC POWER, USED WHEN
POWERING DISCRETE INPUTS
DISCRETE INPUTS WITH INTERNAL POWER SUPPLY
CONFIGURABLE (FAILSAFE OVERRIDE)
CONFIGURABLE (CB AUX)
SPEED TRIM RAISE
SPEED TRIM LOWER
LOAD / UNLOAD
SELECT BASELOAD
MINIMUM FUEL, CLOSE TO RUN
CONFIGURABLE (IDLE / RATED)
CONFIGURABLE (FAILSAFE OVERRIDE)
CONFIGURABLE (CB AUX)
SPEED TRIM RAISE
SPEED TRIM LOWER
LOAD / UNLOAD
SELECT BASELOAD
Figure 1-2b. 2301D Plant Wiring Diagram (sheet 2)

2301D/2301D-EC Digital Control Manual 26247
8 Woodward
Figure 1-2c. 2301D Plant Wiring Diagram (notes)

Manual 26247 2301D/2301D-EC Digital Control
Woodward 9
Chapter 2.
Installation
Introduction
This chapter contains general installation instructions for the 2301D control.
Power requirements, environmental precautions, and location considerations are
included to determine the best location for the control. Additional information
includes unpacking instructions, electrical connections, and an installation check-
out procedure.
Unpacking
Before handling the control, read Chapter 2 “Electrostatic Discharge Awareness”.
Be careful when unpacking the electronic control. Check the control for signs of
damage such as bent or dented panels, scratches, and loose or broken parts. If
any damage is found, immediately notify the shipper.
Power Requirements
The 2301D control requires a voltage source of 18 to 40 Vdc, with a current
capacity of at least 900 mA for operating power. 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 damage to the control, make sure that the alternator or
other battery-charging device is turned off or disconnected before
disconnecting the battery from the control.
Location Considerations
This product is intended for installation in a “closed electrical operating area” or in
an enclosed industrial control cabinet. 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
Avoidance of vibration
Selection of a location that will provide an operating temperature range of
–40 to +70 °C (–40 to +158 °F)
The control must NOT be mounted on the engine.

2301D/2301D-EC Digital Control Manual 26247
10 Woodward
Electrical Connections
All inputs and outputs are made through screwless spring-actuated terminal
blocks. For EMI reasons, it is recommend that all low-current wires be separated
from all high-current wire.
The spring clamp can be actuated by using a standard 2.5 mm or 3/32 inch flat
bladed screwdriver. The terminal blocks accept wires from 0.08–4 mm² (27–12
AWG). Two 18 AWG or three 20 AWG wires can be easily installed in each
terminal. Wires for the fixed mounted power terminals should be stripped 5–6
mm (0.22 inch) long.
Do not tin (solder) the wires that terminate at the terminal blocks. The
spring-loaded terminal blocks are designed to flatten stranded wire,
and if those strands are tinned together, the connection loses
surface area and is degraded.
Shields and Grounding
An individual shield termination is provided at the terminal block for each of the
signals requiring shielding. All of these inputs should be wired using shielded,
twisted-pair wiring. The exposed wire length beyond the shield should be limited
to one 25 mm (1 inch). Relay outputs, contact inputs, and power supply wiring do
not normally require shielding, but can be shielded if desired.
The 2301D is designed for shield termination to earth ground at the control. If
intervening terminal blocks are used in routing a signal, the shield should be
continued through the terminal block. If shield grounding is desired at the
terminal block, it should be ac coupled to earth. All other shield terminations
except at the control should be ac coupled to earth through a capacitor. A 1000
pF, 500 V capacitor is sufficient. The intent is to provide a low impedance path to
earth for the shield at frequencies of 150 kHz and up. Multiple direct connections
of a shield to earth risk high levels of current to flow within the shield (exception,
see note below on cabinet installations).
Shields can be grounded at both ends (2301D and load) if the cable length is
sufficiently short (i.e. within a cabinet) to prevent ground loop current in the
shield.
Cabinet Installations: If the 2301D is installed in a cabinet, shielded
I/O can be terminated directly to the cabinet (earth ground) at the
entry to the cabinet, as well as at the control.
For EMC reasons, it is recommend that all low-current wires be
separated from all high-current wires. Input Power ground terminal
should also be wired to earth ground.

Manual 26247 2301D/2301D-EC Digital Control
Woodward 11
Figure 2-1. Installation of Wiring into Terminal
Setting Speed Range
The Microprocessor inside the 2301D calculates the speed range to be used by
entering the engine/generator synchronous speed and number of gear teeth.
This configured speed sets the hardware-to-software scaling. The rated speed
setting is set in service as the speed reference selected when the Rated switch is
closed.
The number of gear teeth is used by the control to convert pulses
from the speed sensing device to engine rpm. To prevent possible
serious injury from an overspeeding engine, make sure the control is
properly programmed to convert the gear-tooth count into engine
rpm. Improper conversion could cause engine overspeed.
The speed range is factory set for 900 Hz, 900 rpm (60 teeth). Refer to
Chapter 4 to change speed range and prevent possible overspeed.
Using the wrong speed range could cause an overspeed with
resulting damage to equipment or personal injury or death.
Potential Transformer Connections
Connect the potential transformer secondary leads to the following terminals:
Phase A to terminal 1
Phase B to terminal 2
Phase C to terminal 3
The potential transformer secondary line-to-line voltage must produce 90 to 120
Vac or 200 to 240 Vac. Refer to the plant wiring diagram, Figure 1-2.
Current Transformer Connections
The standard method of connecting the current transformers is shown in the
plant wiring diagram, Figure 1-2. An alternate method is the open delta
connection shown in the insert in the plant wiring diagram.

2301D/2301D-EC Digital Control Manual 26247
12 Woodward
Load Sharing Lines
The Load Sharing Lines provide an analog communication path between
compatible controls. The 2301D provides an internal relay for connecting the
Load Sharing Signal to the internal circuitry at the appropriate times. When the
internal relay is closed, a green LED will illuminate between terminals 9 and 10.
Because the load-sharing-line relay is contained in the control, no relay is
required between the control and the load-sharing-line bus. Use shielded cable
and connect the load-sharing lines directly to terminals 10(+) and 11(–). Connect
the shield to terminal 12. When all controls in the system are of the 2301D or
2301A types, the shields may be connected continuously between controls.
When load sharing with different controls, do not connect the shields at the point
where connections are made to the load-sharing-line bus. The droop contact for
selecting droop or isochronous operation is wired in series with the circuit-
breaker auxiliary contact between terminal 34 and terminal 28 (see CB
Aux/Droop contact).
When running a single unit on an infinite bus with an external load control device,
terminals 34 and 37 must be connected to terminal 28 to connect the Load
Matching Circuit to the load-sharing lines. The load-sharing lines must be wired
to the external load control device. The circuit-breaker auxiliary contact will then
be connected to this device and not to the 2301D.
Power Supply
Run the power leads directly from the power source to the control, connecting the
negative lead to terminal 46, and the positive lead to terminal 45.
When power is applied, the 2301D begins performing internal memory tests to
‘boot-up’ the processor, which takes approximately 30 seconds to complete. The
CPU Status LED between terminals 27 and 28 remains on during this boot-up.
The control will remain in I/O lock and will not control the prime mover until the
boot-up is complete. For systems requiring fast start functions, it will be
necessary to continuously power the 2301D.
DO NOT attempt to start the prime mover while the CPU Status LED
is ON.
DO NOT apply power to the control at this time. Applying power
before a control is completely connected may damage the control.
The 18–40 Vdc input power must be supplied from a power
supply/battery charger certified to IEC standard with SELV (Safety
Extra Low Voltage) classified output. The installer should properly
size wiring and fusing for the input power and PT/CT circuits.