Woodward 505E User manual

85018V2A
505E DIGITAL GOVERNORS
FOR EXTRACTION STEAM TURBINES
VOLUME 2
l
Manual 85018V2A

Wood ard Governor Company reserves the right to update any portion of this publication at any time.
Information provided by Wood ard Governor Company is believed to be correct and reliable. Ho ever, no
responsibility is assumed by Wood ard Governor Company unless other ise expressly undertaken.
© 1997 by Wood ard Governor Company
All Rights Reserved
WARNING
Read this entire manual and all other publications pertaining to the
ork to be performed before installing, operating, or servicing this
equipment. Practice all plant and safety instructions and
precautions. Failure to follo instructions can cause personal injury
and/or property damage.
The engine, turbine, or other type of prime mover should be
equipped ith an overspeed (overtemperature, or overpressure,
here applicable) shutdo n device(s), that operates totally
independently of the prime mover control device(s) to protect against
runa ay or damage to the engine, turbine, or other type of prime
mover ith possible personal injury or loss of life should the
mechanical-hydraulic governor(s) or electric control(s), the
actuator(s), fuel control(s), the driving mechanism(s), the linkage(s),
or the controlled device(s) fail.
CAUTION
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.
CAUTION
Electronic controls contain static-sensitive parts. Observe the
follo ing precautions to prevent damage to these parts.
• Discharge body static before handling the control ( ith po er to
the control turned off, contact a grounded surface and maintain
contact hile 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 ith your hands or ith conductive devices.
The letter designation following the manual number is changed to the next letter in alphabetical order when
an important change is made in the manual.
CHANGED AREA ARE INDICATED BY A BLACK LINE IN THE MARGIN.

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TABLE OF CONTENTS
INTRODUCTION.......................................................................................................................................... 1
CHAPTER 1. PERIPHERAL DEVICES...................................................................................................... 3
OVERVIEW.................................................................................................................................................. 3
505 HMI Software.................................................................................................................................. 3
Digital Re ote Final Driver.................................................................................................................... 5
Real Power Sensor................................................................................................................................ 6
Digital Synchronizer and Load Control (DSLC) ..................................................................................... 7
Master Synchronizer and Load Control (MSLC).................................................................................. 11
CHAPTER 2. APPLICATION NOTES ...................................................................................................... 15
OVERVIEW................................................................................................................................................ 15
Speed/Load PID .................................................................................................................................. 15
Extr/ADM PID ...................................................................................................................................... 15
Auxiliary PID ........................................................................................................................................ 16
Cascade PID ....................................................................................................................................... 16
EXAMPLE APPLICATIONS ....................................................................................................................... 17
EXAMPLE 1 PUMP OR COMPRESSOR DISCHARGE PRESSURE CONTROL WITH TURBINE INLET
PRESSURE LIMITING............................................................................................................................... 19
505E Configuration Notes for Exa ple 1: ........................................................................................... 21
Starting & Run Mode Notes for Exa ple 1:......................................................................................... 23
EXAMPLE 2 NLET PRESSURE CONTROL WITH AUTOMATIC SYNCHRONIZING & GENERATOR
POWER LIMITING ..................................................................................................................................... 25
505E Configuration Notes for Exa ple 2: ........................................................................................... 27
Starting & Run Mode Notes for Exa ple 2:......................................................................................... 30
EXAMPLE 3 EXHAUST PRESSURE CONTROL WITH PLANT IMPORT/EXPORT LIMITING................ 32
505E Configuration Notes for Exa ple 3: ........................................................................................... 34
Starting & Run Mode Notes for Exa ple 3:......................................................................................... 36
EXAMPLE 4 PLANT IMPORT/EXPORT CONTROL WITH DRFD SERVO INTERFACE ......................... 39
505E Configuration Notes for Exa ple 4: ........................................................................................... 41
Starting & Run Mode Notes for Exa ple 4:......................................................................................... 44
EXAMPLE 5 INLET PRESSURE CONTROL WITH ISOCHRONOUS LOADSHARING CONTROL IN
ISLAND MODE .......................................................................................................................................... 46
505E Progra ing Notes for Exa ple 5: ...........................................................................................48
Starting & Run Mode Notes for Exa ple 5:......................................................................................... 51
EXAMPLE 6 IMPORT/EXPORT CONTROL OR EXHAUST PRESSURE CONTROL WITH ISOCH LOAD
SHARING IN ISLAND MODE .................................................................................................................... 52
505E Configuration Notes for Exa ple 6: ........................................................................................... 54
Starting & Run Mode Notes for Exa ple 6:......................................................................................... 56
EXAMPLE 7 INLET PRESSURE CONTROL & EXHAUST PRESSURE CONTROL WITH GENERATOR
POWER LIMITING ..................................................................................................................................... 59
505E Configuration Notes for Exa ple 7: ........................................................................................... 61
Starting & Run Mode Notes for Exa ple 7:......................................................................................... 63
EXAMPLE 8 ADMISSION STEAM TURBINE CONTROL WITH BOOTSTRAP STARTUP ...................... 66
505E Configuration Notes for Exa ple 8: ........................................................................................... 67
Starting & Run Mode Notes for Exa ple 8:......................................................................................... 69
EXAMPLE 9 TYPICAL PLANT LOAD AND STEAM PRESSURE CONTROL APPLICATION.................. 71
EXAMPLE 10 INDUCTION GENERATOR APPLICATIONS ..................................................................... 74
CHAPTER 3. OPERATOR INTERFACE.................................................................................................. 75
KEYPAD AND DISPLAY............................................................................................................................ 75

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SERVICE PANEL MODES ........................................................................................................................ 75
USING THE SERVICE MODE ................................................................................................................... 77
TOP LEVEL/ROOT SYSTEM BLOCK................................................................................................. 77
Select Mode Level ............................................................................................................................... 77
Header Level ....................................................................................................................................... 78
Block Level .......................................................................................................................................... 78
Service Mode....................................................................................................................................... 79
Entering The Service Mode ................................................................................................................. 80
Exiting Modes ...................................................................................................................................... 82
Configure Mode ................................................................................................................................... 82
Debug Mode ........................................................................................................................................ 85
OS_FAULTS Mode.............................................................................................................................. 86
Faults Detected Header ................................................................................................................ 89
Alar s Detected Header............................................................................................................... 90
Clear Alar s Detected Header ..................................................................................................... 91
SYS_INFO Mode................................................................................................................................. 92
Syste Infor ation Header .......................................................................................................... 94
Change Password Header ............................................................................................................ 94
Download Configuration Header ...................................................................................................95
CHAPTER 4. SERVICE MODE PROCEDURES...................................................................................... 97
OVERVIEW................................................................................................................................................ 97
THE 505E SERVICE MODE...................................................................................................................... 98
Using Service Menus........................................................................................................................... 98
SERVICE MODE BLOCKS ...................................................................................................................... 107
Optional Service Blocks..................................................................................................................... 107
SERVICE MODE WORKSHEET PARAMETERS.................................................................................... 109
Speed Control Settings...................................................................................................................... 109
Alar Settings ................................................................................................................................... 110
Key Options ....................................................................................................................................... 110
Speed Control Droop Settings (Only If A Generator Unit) ................................................................. 111
MPU Override.................................................................................................................................... 111
AUTO START SEQUENCE (ONLY DISPLAYED IF CONFIGURED) ............................................... 111
Idle / Rated Ra p (Only Displayed If Configured) ........................................................................... 112
Sync / Load Share Settings (Only Displayed If Configured).............................................................. 112
Re ote Speed Settings (Only Displayed If Configured) ................................................................. 112
Extraction Control Settings ................................................................................................................ 113
Re ote Extr Settings (Only Displayed If Configured) ....................................................................... 114
Cascade Control (Only Displayed If Configured)............................................................................... 115
Re ote Casc Settings (Only Displayed If Configured).................................................................... 117
Aux Control Settings (Only Displayed If Configured)......................................................................... 118
Re ote Aux Settings (Only Displayed If Configured)...................................................................... 119
Breaker Logic (Only Displayed If A Generator) ............................................................................... 120
Valve Li iter Settings........................................................................................................................ 121
Local / Re ote Functions (Only Displayed If Configured)................................................................. 122
Monitor Contact Inputs ...................................................................................................................... 122
Monitor Relay Outputs....................................................................................................................... 123
Force Relay Outputs (Only Displayed If Shut Down) ...................................................................... 123
Monitor Speed Inputs ........................................................................................................................ 124
Monitor Analog Inputs........................................................................................................................ 124
Analog In Adjust ents....................................................................................................................... 124
Monitor Analog Outputs..................................................................................................................... 125
Analog Output Adjust ents............................................................................................................... 125
ACT1 Linearization ............................................................................................................................ 125

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ACT2 Linearization ............................................................................................................................ 127
Stea Map Test (Only Displayed If Shut Down) ............................................................................... 128
Stea Map Constants ....................................................................................................................... 129
Port 1 Settings (Only Displayed If Configured) .................................................................................130
Port 2 Settings (Only Displayed If Configured) .................................................................................130
Co Analog Scaling (If Co unications Is Used)......................................................................... 131
Port Configurations............................................................................................................................ 132
CHAPTER 5. UNDERSTANDING PID SETTINGS ................................................................................ 135
OVERVIEW.............................................................................................................................................. 135
Proportional Control........................................................................................................................... 135
Integral Control .................................................................................................................................. 135
Derivative........................................................................................................................................... 135
PROPORTIONAL RESPONSE................................................................................................................ 136
Proportional Gain (Effect Of Settings) ............................................................................................... 136
Integral Response ............................................................................................................................. 136
PROPORTIONAL + INTEGRAL (CLOSED LOOP) ................................................................................. 138
Integral (Effects Of Settings) ............................................................................................................. 138
DERIVATIVE RESPONSE....................................................................................................................... 139
PROPORTIONAL + DERIVATIVE (CLOSED LOOP) .............................................................................. 140
DERIVATIVE (EFFECTS OF SETTINGS) ............................................................................................... 141
PROPORTIONAL + INTEGRAL + DERIVATIVE (CLOSED LOOP)........................................................ 142
Adding Derivative .............................................................................................................................. 143
GENERAL FIELD TUNING GUIDELINES ............................................................................................... 143
Tuning Exa ple................................................................................................................................. 144
CHAPTER 6. HARDWARE/OPERATING SYSTEM FAULTS ............................................................... 147
GENERAL ................................................................................................................................................ 147
Off-Line Diagnostics .......................................................................................................................... 147
On-Line Diagnostics .......................................................................................................................... 148
Operation Errors And Faults.............................................................................................................. 149
Wiring Proble s ................................................................................................................................ 149
Control Adjust ents .......................................................................................................................... 150
Other Operating Proble s................................................................................................................. 150
APPENDIX A. 505E DESIGN SPECIFICATIONS.................................................................................. 151
HARDWARE SPECIFICATIONS ............................................................................................................. 153
GENERAL I/O SPECIFICATIONS ........................................................................................................... 155
SOFTWARE SPECIFICATIONS.............................................................................................................. 157
APPENDIX B. 505E SERVICE MODE WORKSHEET........................................................................... 159
APPENDIX C. PASSWORD INFORMATION......................................................................................... 165
GENERAL ................................................................................................................................................ 167
SERVICE MODE PASSWORD................................................................................................................ 167
DEBUG MODE PASSWORD................................................................................................................... 167
CONFIGURE MODE PASSWORD.......................................................................................................... 167
OS_FAULTS MODE PASSWORD .......................................................................................................... 168
DOWNLOAD CONFIGURATION FUNCTION PASSWORD ................................................................... 168

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LIST OF FIGURES
1-1. 505 HMI Software ........................................................................................................................... 4
1-2. Digital Re ote Final Driver ............................................................................................................. 5
1-3. Real Power Sensor ......................................................................................................................... 6
1-4a. Digital Synchronizer and Load Control............................................................................................ 9
1-4b. Digital Synchronizer & Load Control ............................................................................................. 10
1-5. DSLC Interface Wiring .................................................................................................................. 11
1-6a. Master Synchronizer & Load Control ............................................................................................ 12
1-7b. Master Synchronizer & Load Control ............................................................................................ 13
2-1. Pu p or Co pressor Discharge Pressure Control with Turbine Inlet Pressure Li iting.............. 19
2-2. Inlet Pressure Control with Auto atic Synchronizing & Generator Power Li iting ...................... 25
2-3. Exhaust Pressure Control with Generator Power Li iting and Plant I port/Export Li iting........ 32
2-4. Plant I port/Export Control with DRFD Servo Interface ............................................................... 39
2-5. Inlet Pressure Control with Isochronous Loadsharing Control in Island Mode.............................. 46
2-6. I port/Export Control or Exhaust Pressure Control with Isoch Load Sharing in Island Mode ...... 52
2-7. Inlet Pressure Control, Exhaust Pressure Control with Generator Power Li iting ....................... 59
2-8. Ad ission Stea Turbine Control with Bootstrap Startup ............................................................ 66
2-9. Plant Load and Stea Pressure Control Application .................................................................... 71
3-1. 505E Keypad and Display............................................................................................................. 75
3-2. Software Structure Overview ........................................................................................................ 76
3-3. The Select Mode Level ................................................................................................................. 78
3-4. Header Level................................................................................................................................. 78
3-5. Block Level.................................................................................................................................... 79
3-6. Debug Infor ation Arrange ent................................................................................................... 86
3-7. OS_FAULTS Mode Infor ation Arrange ent .............................................................................. 87
3-8. SYS_INFO Mode Infor ation Arrange ent.................................................................................. 92
4-1. Service Mode Entry....................................................................................................................... 97
4-2. Service Mode Blocks..................................................................................................................... 98
4-2. Service Mode Blocks (continued)................................................................................................. 99
4-2. Service Mode Blocks (continued)............................................................................................... 100
4-2. Service Mode Blocks (continued)............................................................................................... 101
4-2. Service Mode Blocks (continued)................................................................................................ 102
4-2. Service Mode Blocks (continued)............................................................................................... 103
4-2. Service Mode Blocks (continued)............................................................................................... 104
4-2. Service Mode Blocks (continued)............................................................................................... 105
4-2. Service Mode Blocks (continued)............................................................................................... 106
5-1. Proportional Gain Setting Effects ................................................................................................ 136
5-2. Open Loop Proportional and Integral Response......................................................................... 137
5-3. Closed Loop Proportional and Integral Response ...................................................................... 138
5-4. Integral Gain (Reset) Setting Responses.................................................................................... 139
5-5. Closed Loop Proportional and Derivative Action........................................................................ 140
5-6. Derivative Setting Effects ............................................................................................................ 141
5-7. Closed Loop Proportional, Integral and Derivative Action........................................................... 142
5-8. Typical Response to Load Change .............................................................................................144

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LIST OF TABLES
2-1. Exa ple Su ary........................................................................................................................ 18

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Manual 85018V2 505E Digital Governor
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INTRODUCTION
Manual 85018V2 Volume #2 is a dual purpose manual. This manual includes
application specific notes and 505E specific ervice mode information.
The first part of this manual is written to give users an idea of the 505E Digital
Control’s capabilities, and how to apply them to a system. Typical applications
are schematically shown and their functionality explained. Programming and
tart/Run mode notes are given for each application to assist application
programmers in configuring the 505E for their application.
The second part of this manual includes 505E program modes of operation not
covered in Volume #1 of this manual ( ervice, Debug, Y _INFO, OP Y
Faults ), PID dynamic setting specifics, and hardware rating information.
General Installation and Operating Notes and Warnings:
This Equipment is suitable for use in Class I, Division 2 , Groups A,
B, C, and D or nonhazardous locations. Field iring must be rated at
least 75°C for operating ambient temperatures expected to exceed
50°C.
Peripheral equipment must be suitable for the location in hich it is
used.
Wiring must be in accordance ith Class I, Division 2 iring methods
and in accordance ith the authority having jurisdiction.
Explosion Hazard - Substitution of components may impair
suitability for Class I, Division 2
AVERTISSEMENT
Risque d’explosion - La substitution de composants peut rendre ce
matériel inacceptable pour les emplacements de Classe I, Division
WARNING
Explosion Hazard - Do not disconnect equipment unless po er has
been s itched off or the area is kno n to be nonhazardous.
AVERTISSEMENT
Risque d’explosion - Avant de déconnecter l’équipement, couper le
courant ou s’assurer que l’emplacement est désigne non dangereux.

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CHAPTER 1
PERIPHERAL DEVICES
OVERVIEW This chapter provides a brief explanation of peripheral devices, that can be used
with the 505E. By understanding the functionality of a peripheral device, a better
understanding of the overall control configuration can be achieved.
All the devices covered in this section are manufactured or supported by the
Woodward Governor Company. Peripheral devices manufactured by other
companies can be used with the 505E to perform the functions detailed bellow,
however, the compatibility of them to the 505E and the application should be
verified before system operation.
505 HMI Soft are Woodward offers two different HMI software packages, OpView and 505View,
which allow an operator to remotely view operating inputs, adjust control
setpoints, issue Run mode commands, and monitor/troubleshoot the turbine
control. Both HMI packages are self-configuring which eliminates all field
engineering - they automatically configure their screens to match the control's
programmed application.
The OpView is comprised of an industrialized NEMA 4 touchscreen hardware
package bundles together with a Woodward developed software interface
program. The 505View is a unbundled Intellution-based software package that
runs on a pc (hardware can be optionally purchased). Both HMI packages are pre-
configured to communicate via modbus protocol with either a 505 or 505E
Woodward steam turbine control and offer the following features.
• Automatic creen Generation based on control configuration
• ecurity with multiple User Levels
• Remote Access Capability1
• Real-Time and Historical Trending2
• Alarm/Trip tatus Indication
• Alarm/Trip Log with Time Tagging and First-Out Indication
• I/O and ystem Troubleshooting
• Graphic ystem Control screens
• Event tatus Logging and History3
Notes:
1 505View only
2 OpView has Real-Time Trending only; 505View has both
3 OpView has Logging only; 505View has Logging and History

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Figure 1-1. 505 HMI oftware
By connecting the OpView or 505View to either 505E Modbus® port, it
automatically configures its screens to match the 505E’s programmed application.
If the 505E is not configured to accept Modbus commands, the HMI functions as
a system monitor only. If the 505E is configured to accept Modbus commands, all
505E Run Mode operations can be monitored and performed through it (start,
stop, mode enable/disable, setpoint raise/lower). For safety purposes, the
Overspeed test function can not be performed through the HMI. ee Volume 1,
Chapter 7 of this manual for more information on programming Modbus ports.
User-friendly touch screens allow operators to view and control multiple modes of
operation and setpoints from one screen. Ten different screens are available to
allow operators the flexibility of viewing. These screens display the following
information:
Controlling parameter information
Complete starting sequences
Turbine and/or Generator information
peed, Extr/Adm, Aux, Casc, & Limiter information
Analog Input and Output levels
Contact Input and Relay Output states
Alarm and hutdown Log
The OpView or 505View can interface with the 505E through serial R 232,
R 422, or R 485 communications. By using R 422 or R 485 communications,
the HMI can be located up to 4,000ft (1,220meters) from the 505E digital control.

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Digital Remote
Final Driver
Digital Remote Final Driver (DRFD) is used to interface the 505E digital control
to existing valve operators or Woodward actuators that are integrating in action or
are not compatible with the 505E.
The 505E’s actuator outputs have the capability of driving a 4-20mA or 20-
160mA (200mA max) proportional signal into an actuator coil. These 505E
actuator output signals represent a demand signal equal to desired valve position
(proportional). If the application’s actuator or servo assembly requires a different
drive signal, or control action (integrating with a null setting), a Digital Remote
Final Driver or equivalent device must be used.
Figure 1-2. Digital Remote Final Driver
Woodward Digital Remote Final Drivers accept a 4-20mA actuator-drive signal
proportional to desired valve position, and position a servo assembly accordingly.
Integrating or proportional type DRFDs are available depending on the servo
assembly being interfaced to. Woodward DRFD’s have the capability of driving
unipolar or bipolar actuator demand signals, up to 0-400mA or +400mA
respectively.
The Digital Remote Final Driver is housed in a NEMA-4X enclosure with a
hinged cover and consists of driver and power supply modules. The driver
module uses plug-in jumpers and an alphanumeric display to facilitate field
configuration and calibration.
Proportional type DRFDs can provide an output drive signal of up to 400mA, to
be compatible with existing servo assemblies. This drive signal is proportional to
the 4-20mA input signal received from the 505E digital control.
Integrating type DRFDs sense actual valve position (through, LVDTs, RVDTs,
MLDTs, or DC position feedback devices), compare this signal to the input
position demand signal from the 505E, and output a drive signal to position a
servo assembly accordingly. ee Figure 1-2.

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Please refer to Woodward Product pec 85532 for more information on DRFDs
and their capabilities.
Real Po er
Sensor
A Real Power ensor is used to sense the real power produced by a generator or
flowing through a tie line. Woodward Real Power ensors sense three-phase
volts, three-phase amps, compare each phase’s voltage to current relationship, and
develop a 4-20mA output proportional to real power.
Figure 1-3. Real Power ensor
Woodward manufactures two types of Real Power ensors. The first type of RP
is designed to sense power flow in one direction only (0 to +5Amp CT current
only), and output a proportional 4-20mA signal. This type of RP was designed
for and should be used to sense generator power output. Many different real
power sensors of this type exist. ome of the optional RP features include VAR
sensing, Loadsharing, 0-1Amp CT current sensing, and multiple combinations of
these. Please consult a Woodward certified distributor or a Woodward factory for
the recommended RP for your application.
The second type of RP manufactured by Woodward is designed to sense power
flow through a bus-to-bus tie line. This RP (8272-726) senses -5A to +5A CT
current to allow its output to represent power flow in both directions. This RP
provides a 4-20mA power indication output signal where 12mA represents 0
power flow. It is recommended that this RP be used to sense power flow
through a tie line only. This RP or equivalent is required to sense plant Import
and Export power.

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Woodward Real Power ensors have terminals labeled “Output” and terminals
labeled “KW Readout”. The “KW Readout” terminals provide a 4-20mA signal
proportional to real power which is used by and compatible with the 505E control.
Thus the RP terminals labeled “Output” are designed and typically compatible
only to Woodward’s 2301 type of control.
Woodward manufactured Real Power ensors have a 2.5Hz Low pass filter
(400msec lag time) on their output to filter out the high frequency noise typically
created in a switch gear type environment. Thus if another vender’s watt
transducer is used, verification that it has similar filtering criteria should be
performed before it is applied with the 505E. For more information on
Woodward Real Power ensors, please refer to Woodward manual 82018.
Digital
Synchronizer and
Load Control
(DSLC)
The Woodward D LC is a microprocessor based generator load control designed
for use on three-phase AC generators with Woodward speed controls and
automatic voltage regulators. The D LC is a synchronizer, a load control, a dead
bus closing system, a VAR/PF control, and a process control, integrated into one
package.
The 505E can be programmed to use the D LC as a synchronizer only, or as a
synchronizer and load control. The D LC provides either phase match or slip
frequency synchronizing, and ties into the unit automatic voltage regulator to
match voltages before paralleling. It interfaces with the 505E via a peed bias
signal to control generator frequency and phase. When configured to use the
D LC as a synchronizer only, the 505E must be programmed to receive the D LC
peed Bias signal through an analog input and have this input enabled through a
contact input or function key.
The D LC communicates over a LAN using a digital Echelon network with other
system D LCs to enable it to perform safe deadbus closings. Because the D LC
performs all synchronizing functions simultaneously, synchronization typically
takes only a few seconds.
When used as a synchronizer and load control, the D LC performs automatic
synchronization, and controls unit load based on the D LCs mode of operation.
The D LC can be in a base-load, loadsharing, remote load setting, or Process
control mode, depending on configuration and system conditions.
The D LC’s baseload mode of operation allows an operator to set the unit to a
specified load. A proportional or integrating control action can be used with this
mode of operation. The integrating mode of operation can be used with systems
tying to an unstable grid to allow the unit to control at a constant load and not vary
based on grid frequency.
The D LC’s loadsharing mode is used to share load with any other units using a
D LC and tied to the same isolated bus. This mode is used in conjunction with a
Master ynchronizer & Load Control when paralleled to a utility to allow the
M LC to control plant frequency or load depending on its state of operation.

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The D LC’s remote load setting mode allows load to be set by a remote 4-20mA
signal.The D LC’s Process control mode allows any process directly related to
generator load to be controlled.
When using the D LC as both a synchronizer and load control, the 505E control
must be programmed to receive the D LC peed Bias signal through an analog
input and have this input enabled through a contact input or function key.
After synchronization, unit load can be controlled by the D LC (through the 505E
ync/Ld input) or by the 505E’s internal speed/load setpoint. When the ync/Ld
hare input is programmed, the position of the Utility Tie Breaker Contact selects
unit load control through the D LC or through the 505E’s internal load setpoint.
The D LC interfaces to the 505E via a peed Bias signal. From the many
different types of D LCs manufactured by Woodward only a few have a peed
Bias output (1-5Vdc) compatible with the 505E control. The 505E’s isolated
analog #6 input is the only analog input that is directly compatible with the D LC.
Thus the D LC’s speed bias output should only be connected to the # 6 analog
input. The D LC’s speed bias output is designed to drive into the 505E’s low
impedance input.
Once the generator is synchronized the D LC soft-loads the unit to the load
setting determined by the mode of operation (base load, loadsharing, Process
control). When commanded the D LC can also soft-unload the unit and issue a
breaker-open command at a set power level.

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Figure 1-4a. Digital ynchronizer and Load Control

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Figure 1-4b. Digital ynchronizer & Load Control
INSTALLATION NOTES
Hand-held Programmer (9905-292) is required and used by the D LC to
configure and calibrate it to the site specific application.
The D LC requires a power source of +24Vdc @ 1Amp. The 505E power
supplies can not supply this much power, thus an external power supply may be
required.
The D LC can interface with the unit Automatic Voltage Regulator through
contacts or a +9 volt bias signal.
For more information on Woodward’s Digital ynchronizer & Load Control,
please refer to Woodward manual 02007.