Product Manual 02875 (Revision E, 3/2010) : 828 Digital Control
Product Manual 02875 (Revision E, 3/2010) : 828 Digital Control
Product Manual 02875 (Revision E, 3/2010) : 828 Digital Control
(Revision E, 3/2010)
Original Instructions
Hardware Manual
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.
General
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, check manual 26455, Customer
Publication Cross Reference and Revision Status & Distribution Restrictions, on
Revisions the publications page of the Woodward website:
www.woodward.com/publications
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.
Manual 02875
Copyright © Woodward 2001–2010
All Rights Reserved
Manual 02875 828 Hardware Manual
Contents
Woodward i
828 Hardware Manual Manual 02875
Contents
ii Woodward
Manual 02875 828 Hardware Manual
Woodward iii
828 Hardware Manual Manual 02875
iv Woodward
Manual 02875 828 Hardware Manual
Regulatory Compliance
European Compliance for CE Mark
Woodward v
828 Hardware Manual Manual 02875
Nippon Kaiji Kyokai Rules Ch. 1, Part 7, of Guidance for the approval and
(NKK) Type approval of materials and equipment for marine
use and relevant Society’s Rules (Low Voltage Models
only)
vi Woodward
Manual 02875 828 Hardware Manual
Chapter 1.
General Information
Introduction
This manual describes the Woodward 828 Digital Control hardware, 9907-247
(low voltage) and 9907-248 (high voltage).
Application
The 828 Digital Control can be programmed to suit applications requiring two
magnetic pickups (MPUs) or proximity switches (e.g. for torsional filtering) as the
hardware includes two speed inputs. It also includes four analog inputs, three
analog outputs, eight discrete inputs and three discrete outputs, all of which can
be programmed to satisfy the application. The control can be used in load
sharing systems as it contains circuitry and connections to support this.
The two LON channels can be used to support Woodward LonTalk or LINKnet
input/output nodes control functions.
The 828 control (Figure 1-1) consists of a single printed circuit board in a
sheet-metal chassis. Connections are via three terminal strips and three 9-pin
subminiature D connectors.
Control Options
The 828 control requires the following power supply input voltages, with 40 W as
the nominal power consumption at rated voltage:
18–40 Vdc (24 or 32 Vdc nominal)
90–150 Vdc (125 Vdc nominal)
Discrete input voltages provide on/off command signals to the electronic control.
Each discrete input requires 10 mA at its 24 Vdc nominal voltage rating (for 24
volt switching logic).
The control may be used with either proximity switches (see NOTE) or magnetic
pickups. The minimum frequency for steady state speed control is 7.5 Hz. For
more information see Control Specifications (inside back cover).
Woodward 1
828 Hardware Manual Manual 02875
2 Woodward
Manual 02875 828 Hardware Manual
Woodward 3
828 Hardware Manual Manual 02875
4 Woodward
Manual 02875 828 Hardware Manual
Chapter 2.
Installation
Introduction
This chapter contains general installation instructions for the 828 control. Power
requirements, environmental precautions, and location considerations are
included to help you determine the best location for the control. Additional
information includes unpacking instructions, electrical connections, and
installation checkout procedures.
Unpacking
Before handling the control, read Electrostatic Discharge Awareness (page v). Be
careful when unpacking the electronic control. Check the control for signs of
damage such as bent panels, scratches, and loose or broken parts. If any
damage is found, immediately notify the shipper.
Power Requirements
The high-voltage versions of the 828 Digital Speed Control require a voltage
source of 90 to 150 Vdc. The low-voltage versions require a voltage source of 18
to 40 Vdc.
Location Considerations
Consider these requirements when selecting the mounting location:
adequate ventilation for cooling
space for servicing and repair
protection from direct exposure to water or to a condensation-prone
environment
protection from high-voltage or high-current devices, or devices which
produce electromagnetic interference in excess of levels defined in
EN50082–2
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 prime mover.
Woodward 5
828 Hardware Manual Manual 02875
All wiring, except for the last 12 inches (305 mm) adjacent to the control
connection terminals must be inside a metal conduit, metal cable armoring,
enclosed metal cable way, or similar metal acting as a secondary shield. The
metal acting as the secondary shield must be grounded to the same reference
ground as the control chassis. In some cases, the chassis reference ground is
also referred to as Protective Earth (PE). All wiring must also follow the wiring
and shielding requirements given in the specific, separate software manual.
The control must be mounted on a metal mounting plate that is grounded to the
same reference ground potential as the control’s chassis.
Internal Jumpers
The 828 control has ten, two-position internal jumpers (JPR1 through JPR20)
located on the top of the printed circuit board. If it is necessary to change any
jumper to match your control requirements, and this suits the nature of the
software, be sure to read Electrostatic Discharge Awareness (page v).
Remove power and all inputs. Wait 45 seconds, then remove cover. With your
fingers or a small pair of tweezers, carefully remove the appropriate jumper and
replace it securely over the proper two connectors (see Figure 2-1).
6 Woodward
Manual 02875 828 Hardware Manual
Woodward 7
828 Hardware Manual Manual 02875
The jumper connections are listed:
JPR10 analog output #1 0–1 mA
* JPR9 analog output #1 0–20 mA
JPR12 analog output #2 0–1 mA
* JPR11 analog output #2 0–20 mA
* JPR13 & JPR2 actuator output #1 0–200 mA, single
JPR13 & JPR1 actuator output #1 0–20 mA, single
JPR14 & JPR2 actuator output #1 0–160 mA, tandem
JPR15 & JPR3 actuator output #2 0–200 mA, single
* JPR15 & JPR4 actuator output #2 0–20 mA, single
JPR16 & JPR3 actuator output #2 0–160 mA, tandem
JPR5 & JPR17 speed sensor #1 proximity switch
(see NOTE on page 2)
* JPR6 & JPR18 speed sensor #1 magnetic pickup
JPR7 & JPR20 speed sensor #2 proximity switch
(see NOTE on page 2)
* JPR8 & JPR19 speed sensor #2 magnetic pickup
*—default jumper settings
Electrical Connections
External wiring connections and shielding requirements for each installation are
shown in Chapter 5 of the software manual appropriate to the application.
Shielded Wiring
All shielded cable must be twisted conductor pairs. Do not attempt to tin the
braided shield. All signal lines should be shielded to prevent picking up stray
signals from adjacent equipment. Connect the shields to the nearest chassis
ground. Wire exposed beyond the shield should be as short as possible, not
exceeding 50 mm (2 inches). The other end of the shields must be left open and
insulated from any other conductor. DO NOT run shielded signal wires along with
other wires carrying large currents. See Woodward application note 50532,
Interference Control in Electronic Governing Systems for more information.
Where shielded cable is required, cut the cable to the desired length and prepare
the cable as instructed below.
1. Strip outer insulation from BOTH ENDS, exposing the braided or spiral
wrapped shield. DO NOT CUT THE SHIELD.
2. Using a sharp, pointed tool, carefully spread the strands of the shield.
3. Pull inner conductor(s) out of the shield. If the shield is the braided type, twist
it to prevent fraying.
8 Woodward
Manual 02875 828 Hardware Manual
Run the power leads directly from the power source to the control. DO NOT
POWER OTHER DEVICES WITH LEADS COMMON TO THE CONTROL. Avoid
long wire lengths. Connect the positive (line) to terminal 1 and negative
(common) to terminal 2. If the power source is a battery, be sure the system
includes an alternator or other battery-charging device.
Do NOT apply power to the control at this time. Applying power may
damage the control.
Woodward 9
828 Hardware Manual Manual 02875
Discrete inputs are the switch input commands to the 828 control. In low voltage
systems, or other systems where nominal 24 Vdc is available, the discrete inputs
should be powered by this external voltage.
If you are using the control-supplied aux voltage, jumper terminal 37 to terminal
38. This connects the control's common to the discrete input common. Terminal
39 then supplies power (approximately +24 Vdc) to the discrete inputs. Since the
aux voltage is not isolated from other control circuits, use only isolated contacts
(dry or signal voltage rated) for the discrete circuits. DO NOT POWER ANY
OTHER DEVICES WITH THE AUX VOLTAGE SOURCE.
If you are supplying the discrete input voltage (24 Vdc), connect the voltage
source negative (–) to terminal 37 (DO NOT INSTALL THE JUMPER FROM
TERMINAL 37 TO 38). Then run the voltage source positive (+) to the
appropriate switch or relay contact and then to the corresponding discrete input.
10 Woodward
Manual 02875 828 Hardware Manual
1. Visual inspection
A. Check the linkage between the actuator and fuel metering device for
looseness or binding. Refer to the appropriate actuator manual, and
Manual 25070, Electric Governor Installation Guide for additional
information on linkage.
B. Check for correct wiring in accordance with the plant wiring diagram,
(see relevant Application Manual).
C. Check for broken terminals and loose terminal screws.
D. Check the speed sensor(s) for visible damage. If the sensor is a
magnetic pickup, check the clearance between the gear and the
sensor, and adjust if necessary. Clearance should be between 0.25
and 1.25 mm (0.010 and 0.050 inch) at the closest point. Make sure the
gear runout does not exceed the pickup gap.
Check for grounds by measuring the resistance from all control terminals to
chassis. All terminals except terminals 2 and 24 should measure infinite
resistance (the resistance of terminals 2 and 24 depends on whether a floating or
grounded power source is used). If a resistance less than infinite is obtained,
remove the connections from each terminal one at a time until the resistance is
infinite. Check the line that was removed last to locate the fault.
Woodward 11
828 Hardware Manual Manual 02875
2. Shields must not be grounded at any external point unless otherwise noted.
3. All shields must be carried continuously through all terminal blocks and must
not be tied to other shields except at the common ground point. Tie all
shields together at the ground stud located near connector J1.
6. Discrete inputs are isolated prom other circuits and intended to be powered
by TB1-39 (+24 Vdc) leaving the jumper in place. Input current is nominally
10 mA per input into 2210 Ω.
8. Analog output signals to other systems must be isolated from ground either
by design or employment of isolation amplifiers.
9. Analog input signals from other systems must be isolated from ground either
by design or employment of isolation amplifiers.
13. Internal power supply provides dc isolation between the power source and all
other inputs and outputs.
14. Communication port J1 car only be used with the Woodward ST2000 hand
held programmer.
16. This analog output may connect to a metering/controlling device. The shield
should be continuous between all connected devices with a single shield
termination point to ground.
12 Woodward
Manual 02875 828 Hardware Manual
Woodward 13
828 Hardware Manual Manual 02875
Termination
For RS-422, termination should be located at the receiver when one or more
transmitters are connected to a single receiver. When a single transmitter is
connected to one or more receivers, termination should be at the receiver
farthest from the transmitter. Figure 2-3 is an example.
If you do not know if a master can put its transmitter into a high-impedance state,
terminate the line as shown in Figure 2-3. It does not hurt to terminate the line
even when it is not needed as in the case of the OpTrend operator interface.
14 Woodward
Manual 02875 828 Hardware Manual
Termination is accomplished using a three-resistor voltage divider between a
positive voltage and ground. The impedance of the resistor network should be
equal to the characteristic impedance of the cable. This is usually about 100 to
120 ohms. The purpose is to maintain a voltage level between the two differential
lines so that the receiver will be in a stable condition. The differential voltage can
range between 0.2 and 6 volts; but the maximum voltage between either receiver
input and circuit ground must be less than 10 volts. There is one termination
resistor network for each port located on the 828 board. Connection to this
resistor network is made through the 9-pin connectors on pins 6 and 9. See
Figures 2-5 through 2-8 for termination and cable connection examples.
Figure 2-5. 828 RS-232 Connections Figure 2-6. 828 RS-422 Connections w/Optional
Termination at Receiver
Figure 2-7. 828 RS-422 Connections w/Optional Figure 2-8. 828 RS-422 Connections w/Optional
Termination at Transmitter Termination at Transmitter
Woodward 15
828 Hardware Manual Manual 02875
Figure 2-9. Preferred Multipoint Wiring Using Shielded Twisted-pair Cable with a
Separate Signal Ground Wire
16 Woodward
Manual 02875 828 Hardware Manual
Woodward 17
828 Hardware Manual Manual 02875
Chapter 3.
Entering Control Set Points
Introduction
Due to the variety of installations, plus system and component tolerances, the
828 control must be tuned to each system for optimum performance.
This chapter contains information on how to enter control set points through the
control's menu system using the Hand Held Programmer. If you have access to
the Watch Window software tool and Servlink software, you can set up and tune
the 828 control from a PC (personal computer) using the instructions in Chapter
4 of this manual.
The programmer screen is a four-line, backlit LCD display. The display permits
you to look at two separate functions or menu items at the same time. Use the
UP/DOWN ARROW key to toggle between the two displayed items. The BKSP
and SPACE keys will scroll through the display to show the remainder of a
prompt if it is longer than the display screen's 18 characters.
The 828 has two sets of menus—the Service menus and the Configure menus.
The Service menus allow easy access and tuning while the engine is running.
The Configure menus may be entered only if the I/O is shutdown (hence the
engine stopped).
18 Woodward
Manual 02875 828 Hardware Manual
Configure Menus
To access the Configure menus, the engine must be shut down. Press the key.
The display will show, “To select configure, press enter”. Press the ENTER key
and the display will show, “To shutdown I/O, press enter”. Press the ENTER key
and this will allow you into the Configure menus.
If the engine is running during this process, it will be shut down due
to shutting down the I/O of the control.
To move between the menus use the LEFT ARROW and RIGHT ARROW keys.
To move through the set points within a menu, use the UP ARROW and DOWN
ARROW keys. Once within a menu, to return to the menu header, press the ESC
key.
To leave the Configure menus press the ESC key. The set points will be
automatically saved when leaving Configure.
Service Menus
To access the Service menus press the DOWN ARROW key. To move between
menus, and to move through set points within menus follow the instructions as
for the Configure menus. Also to return to return to the menu header, or to leave
Service, follow the Configure instructions.
To obtain an exact value, press the = key. Key in the required figure and press
ENTER.
This may be done only if the figure is within 10% of the existing
value.
To save set points at any time, use the SAVE key. This will transfer all new set
point values into the EEPROM memory. The EEPROM retains all set points
when power is removed from the control.
Woodward 19
828 Hardware Manual Manual 02875
20 Woodward
Manual 02875 828 Hardware Manual
Chapter 4.
Using Servlink with Watch Window
1. Make sure that all other programs that may access your computer
communications port are shut down.
2. Get the right cable to talk from your PC to the control (5416-614 will work for
J2 and J3, 5416-870 for J1).
3. Start the Servlink server and open a new file. Select the proper COM port for
your PC, verify that POINT TO POINT communications mode is selected,
and verify that the baud rate matches the baud rate of the 828 . The default
baud rate is 19 200. See the on-line help file if you have been changing the
port settings of your control.
4. Select OK. If everything is working right, you should see an animated picture
of a string of “1”s and “0”s flying from the control to the PC on your screen.
You now have a network definition file whose default name is NET1. You
should save this file as “your filename.NET” (use FILE/SAVE AS). Link this
name to your control part number, as it will work only with that application.
For instance, if the upper level control number is 9907-031, you could save
the file as 9907031.NET. Do not disconnect the server.
5. In the Servlink window you will now have another dialog window titled “your
filename.net”. In this window you will see a ballhead icon and a control
identifier name. Unless you have given the control a serial number (or name)
with the SLSN.EXE program, this name will display as “<unidentified>”.
6. Start the Watch Window application. When Watch executes, you will have a
screen displaying three windows entitled Watch Window, Explorer, and
Inspector.
7. The Explorer window will have two groups displayed, SERVICE and
CONFIGURE. Double clicking on either of these will expand them to show
groups of values. Explorer is used only to locate a tunable or monitor value.
In order to change a value or monitor a value, you must drag and drop a
value from the Explorer window into the Inspector window.
Woodward 21
828 Hardware Manual Manual 02875
8. Once a value is displayed in the Inspector, you can see several blocks of
information. The most important blocks for a tunable value are the FIELD and
VALUE blocks. The FIELD block is used to identify a particular value, and the
VALUE block displays the current value of a variable. There are two types of
values available in Watch. One is a monitor value, which is marked in the
INSPECTOR window with a pair of glasses. This means it may only be
looked at. The other value is a read/write value, which is marked with a
pencil. The read/write type may be modified using the up and down arrows in
the value block.
This is the only way to download to an 828, and it will not work on a
regular 723.
1. Make sure that all other programs that may access your computer’s
communication port are shut down.
2. Get the right cable to talk from your PC to the control J1 port (5416-870 ).
3. Start the Servlink server and open a new file. From the dialog window, select
the proper COM port for your PC, select POINT TO POINT communications
mode, and set the baud rate to 19200.
4. Select OK. If everything is working right, you should see an animated picture
of a string of “1”s and “0”s flying from the control to the PC on your screen.
You now have a network definition file whose default name is NET1. You
should save this file. Link this name to your control part number as it will only
work with that application. For instance if the upper level control number is
9907-031, you could save the file as 9907031.NET. Do not disconnect the
server.
5. In the Servlink window you will now have another dialog window titled “your
filename.net”. In this window you will see a ballhead icon and a control
identifier name. Unless you have given the control a serial number (or name)
with the SLSN.EXE program, this name will display as “<unidentified>”. Note
this name.
Start the Watch Window program. Under the title bar in the Explorer window you
will find a tab with your network file and the control ID displayed. Right click this
tab to display the pop-up menu, and select LOAD APPLICATION. This will close
the Inspector window and open a new window where you will enter the name of
the file you want to download. Once the filename is correct, click on the OPEN
button. A Warning screen will ask you to make sure the engine is shut down
before downloading. Downloading will proceed automatically once your accept
the message to shut down the engine.
22 Woodward
Manual 02875 828 Hardware Manual
Note that this will not work with regular 723 controls.
1. Make sure that all other programs that may access your computer’s
communication port are shut down.
2. Get the right cable to talk from your PC to the control (5416-870 for J1 ,
5415-614 for J2 or J3).
3. Start the Servlink server and open a new file. From the dialog window, select
the proper COM port for your PC, select POINT TO POINT communications
mode, and set the baud rate to 19200.
4. Select OK. If everything is working right, you should see an animated picture
of a string of “1”s and “0”s flying from the control to the PC on your screen.
You now have a network definition file whose default name is NET1. You
should save this file. Link this name to your control part number as it will only
work with that application. For instance if the upper level control number is
9907-031, you could save the file as 9907031.NET. Do not disconnect the
server.
5. In the Servlink window you will now have another dialog window titled “your
filename.net”. In this window you will see a ballhead icon and a control
identifier name. Unless you have given the control a serial number (or name)
with the SLSN.EXE program, this name will display as “<unidentified>”. Note
this name.
6. Start the Watch Window program. Under the title bar in the Explorer window
you will find a tab with your network file and the control id displayed. Right
click this tab to display the pop-up menu, and select CONFIGURATION. If
you want to take the configuration from a control, select SAVE TO FILE. If
you want to download a new configuration to a control with an existing
application, then select LOAD FROM FILE.
7. If you select SAVE TO FILE, you will have to provide the name of a file that
you want to save the configuration to. If your control has a part number of
9907-031 then you might want to call this file 9907031.cfg. Make the name
meaningful so you can find it easily the next time you need it.
8. If you select LOAD FROM FILE you will get a confirmation warning telling
you that the unit will be shut down. If you answer yes then you will be asked
for the name of the configuration file that you want to download.
Woodward 23
828 Hardware Manual Manual 02875
Chapter 5.
Product Support and Service Options
OEM or Packager Support: Many Woodward controls and control devices are
installed into the equipment system and programmed by an Original Equipment
Manufacturer (OEM) or Equipment Packager at their factory. In some cases, the
programming is password-protected by the OEM or packager, and they are the best
source for product service and support. Warranty service for Woodward products
shipped with an equipment system should also be handled through the OEM or
Packager. Please review your equipment system documentation for details.
24 Woodward
Manual 02875 828 Hardware Manual
Replacement/Exchange: Replacement/Exchange is a premium program
designed for the user who is in need of immediate service. It allows you to
request and receive a like-new replacement unit in minimum time (usually within
24 hours of the request), providing a suitable unit is available at the time of the
request, thereby minimizing costly downtime.
This option allows you to call your Full-Service Distributor in the event of an
unexpected outage, or in advance of a scheduled outage, to request a
replacement control unit. If the unit is available at the time of the call, it can
usually be shipped out within 24 hours. You replace your field control unit with
the like-new replacement and return the field unit to the Full-Service Distributor.
Flat Rate Repair: Flat Rate Repair is available for many of the standard
mechanical products and some of the electronic products in the field. This
program offers you repair service for your products with the advantage of
knowing in advance what the cost will be.
Flat Rate Remanufacture: Flat Rate Remanufacture is very similar to the Flat
Rate Repair option, with the exception that the unit will be returned to you in “like-
new” condition. This option is applicable to mechanical products only.
When shipping the item(s), attach a tag with the following information:
return number;
name and location where the control is installed;
name and phone number of contact person;
complete Woodward part number(s) and serial number(s);
description of the problem;
instructions describing the desired type of repair.
Packing a Control
Use the following materials when returning a complete control:
protective caps on any connectors;
antistatic protective bags on all electronic modules;
packing materials that will not damage the surface of the unit;
at least 100 mm (4 inches) of tightly packed, industry-approved packing material;
a packing carton with double walls;
a strong tape around the outside of the carton for increased strength.
Replacement Parts
When ordering replacement parts for controls, include the following information:
the part number(s) (XXXX-XXXX) that is on the enclosure nameplate;
the unit serial number, which is also on the nameplate.
Woodward 25
828 Hardware Manual Manual 02875
Engineering Services
Woodward’s Full-Service Distributors offer various Engineering Services for our
products. For these services, you can contact the Distributor by telephone or by
email.
Technical Support
Product Training
Field Service
Technical Support is available from your equipment system supplier, your local
Full-Service Distributor, or from many of Woodward’s worldwide locations,
depending upon the product and application. This service can assist you with
technical questions or problem solving during the normal business hours of the
Woodward location you contact.
You can also contact the Woodward Customer Service Department at one of the
following Woodward facilities to obtain the address and phone number of the
nearest facility at which you can obtain information and service.
26 Woodward
Manual 02875 828 Hardware Manual
Technical Assistance
If you need to contact technical assistance, you will need to provide the following information.
Please write it down here before contacting the Engine OEM, the Packager, a Woodward
Business Partner, or the Woodward factory:
General
Your Name
Site Location
Phone Number
Fax Number
Number of Cylinders
Type of Fuel (gas, gaseous, diesel,
dual-fuel, etc.)
Power Output Rating
Application (power generation, marine,
etc.)
Control/Governor Information
Control/Governor #1
Serial Number
Control/Governor #2
Serial Number
Control/Governor #3
Serial Number
Symptoms
Description
If you have an electronic or programmable control, please have the adjustment setting positions or
the menu settings written down and with you at the time of the call.
Woodward 27
828 Hardware Manual Manual 02875
Appendix.
System Troubleshooting Guide
The following is a general troubleshooting guide for areas to check which may
present potential difficulties. By making these checks appropriate to your engine/
turbine before contacting Woodward for technical assistance, your system
problems can be more quickly and accurately assessed.
Actuators
Is the oil clean?
Is the oil level normal?
Does the actuator have the correct hydraulic pressure (if required)?
Does the actuator have the correct pneumatic pressure (if required)?
Does the driveshaft rotate (if required), and in the correct direction?
Is the actuator wiring correct?
Is the direction of the stroke correct?
Has the compensation (if so equipped) been adjusted correctly?
If there is a mechanical governor, are the speed, droop, and load limit
adjusted correctly?
Is the hydraulic return line free and not clogged?
Is there back pressure on the hydraulic return line?
Is the feedback (if any) adjusted correctly and sending the correct signal?
Linkage
Is there slop or lost motion?
Is there misalignment, binding, or side loading?
Is there visible wear or scarring?
Does the linkage move smoothly
Valves
Does the valve move through it’s proper stroke smoothly?
Does the valve travel it’s full stroke?
Can mid-stroke be obtained and held?
Does the valve fully seat (close) before the governor reaches full minimum
stroke?
Does the valve fully open before the governor reaches maximum stroke?
Is the bypass valve(s) (if any) in the proper position?
If a steam turbine, are there nicks or contamination which allow steam to
pass when the valve is closed?
Oil/Hydraulic System
Is the oil at the proper operating pressure?
Is the oil temperature too high for the type of oil being used?
Is the oil contaminated?
Does the actuator have sufficient flow of oil?
Are the accumulators (if any) charged to the correct pressure?
Are the filters plugged?
Is the oil pump operating properly?
28 Woodward
Manual 02875 828 Hardware Manual
Fuel/Steam Conditions
Is the engine/turbine inlet pressure at design specification?
Is the fuel/steam pressure in the proper operating range?
Are pressure transducers (if any) located close to the engine/turbine?
Are there any pressure regulating devices or valves which may interfere with
governor operation or proper fuel/steam flow?
Input Signals
Are all input signals properly scaled?
Are the inputs free of electrical noise and properly shielded?
Is the wiring correct?
Have all field input signals to the control been verified?
Is the polarity of the signals correct?
Output Signals
Are the outputs calibrated?
Have the actuator drivers been calibrated to the stroke of the fuel injection
pump, fuel valves, or turbine valves?
Are the output signals free of noise and properly shielded?
Is the wiring correct?
Transducers
Is the transducer calibrated for the proper range?
Has it been tested by simulating it’s input and measuring it’s output signal?
Does the transducer have power?
Are the sensing lines feeding the transducer clear of obstructions?
Are all block, bleed, and bypass valves positioned properly?
Woodward 29
828 Hardware Manual Manual 02875
Electrical Connections
Are all electrical connections tight and clean?
Are all signal wires shielded?
Are shields continuous from the device to the control?
Are the shields terminated according to Woodward specifications?
Are there low voltage signal wires running in the same wiring trays as high
voltage wiring?
Are the governor’s signal common or grounds not tied to any other devices?
Have the signals been checked for electrical noise?
Voltage Regulator
Is the voltage regulator working properly?
External Devices
Are there external devices the control is dependent on for input signals?
Are these devices providing the correct signal to the control?
Is the external device configured or programmed to be compatible with the
control?
30 Woodward
Manual 02875 828 Hardware Manual
Woodward 31
828 Hardware Manual Manual 02875
Declaration
32 Woodward
Manual 02875 828 Hardware Manual
Woodward 33
We appreciate your comments about the content of our publications.
Send comments to: icinfo@woodward.com