Woodward 721 User manual

Product Manual 02714
(Revision A)
Original Instructions
721 Digital Control
8280-133, 8280-134, 9906-118, 9906-119
Hardware Only
Hardware 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.
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 1994
All Rights Reserved

Manual 02714 721 Digital Control Hardware Manual
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Contents
ELECTROSTATIC DISCHARGE AWARENESS .................................................. II
CHAPTER 1. GENERAL INFORMATION...........................................................1
Introduction.............................................................................................................1
Application..............................................................................................................1
Control Options.......................................................................................................1
721 Digital Speed Control Accessories..................................................................2
CHAPTER 2. INSTALLATION..........................................................................5
Scope......................................................................................................................5
Unpacking...............................................................................................................5
Power Requirements..............................................................................................5
Location Considerations.........................................................................................5
Internal Jumpers.....................................................................................................6
Electrical Connections............................................................................................6
Installation Checkout Procedure ..........................................................................10
CHAPTER 3. ENTERING CONTROL SET POINTS...........................................12
Introduction...........................................................................................................12
Hand Held Programmer and Menus.....................................................................12
CHAPTER 4. FUNCTION BLOCK DIAGRAM...................................................15
CHAPTER 5. PRODUCT SUPPORT AND SERVICE OPTIONS...........................17
Product Support Options......................................................................................17
Product Service Options.......................................................................................17
Returning Equipment for Repair...........................................................................18
Replacement Parts...............................................................................................18
Engineering Services............................................................................................19
Contacting Woodward’s Support Organization ....................................................19
Technical Assistance............................................................................................20
721 CONTROL SPECIFICATIONS.................................................................21
Illustrations and Tables
Figure 1-1. 721 Digital Speed Control....................................................................3
Figure 1-2. Hand Held Programmer.......................................................................4
Figure 3-1. 721 Control Internal Jumpers...............................................................7
Figure 3-2. 721 I/O ...............................................................................................11
Figure 4-1. Hand Held Programmer Functions ....................................................14

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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 02714 721 Digital Control Hardware Manual
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Chapter 1.
General Information
Introduction
This manual describes the Woodward 721 Digital Control hardware, 8280-133
(low voltage), 8280-134 (high voltage), 9906-118 (low voltage, marine type
approval), and 9906-119 (high voltage, marine type approval).
Application
The 721 Digital Control can be programmed to suit applications requiring two
magnetic pickups (MPUs) or proximity switches (such as 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 deal with this.
The 721 control (Figure 1-1) consists of a single printed circuit board in a sheet-
metal chassis. Connections are via three terminal strips and a 9-pin subminiature
D connector.
Control Options
The 721 control requires the following power supply input voltages, with 18 watts
as the nominal power consumption at rated voltage:
18–32 Vdc (24 Vdc nominal)
88–132 Vac 45–65 Hz (120 Vac 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).
Other control options are:
proximity switch input for speed signal frequencies below 100 Hz
tandem actuator outputs
The control may be used with either proximity switches or magnetic pickups. The
minimum frequency for steady state speed control is 7.5 Hz. For more
information see Control Specifications (inside back cover).

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721 Digital Speed Control Accessories
Hand Held Programmer (Figure 1-2), part number 9905-292, is used for adjusting
the 721 control. It plugs into the serial port of the control.
SPM-A Synchronizer, for synchronizing the generator phase to that of the power
bus. The synchronizer generates a close generator breaker signal to parallel the
generator with the power bus.
Power Output Sensor, for load sharing or droop operation in mechanical load
applications.
Real Power Sensor, for load sharing or droop-parallel generator applications.

Manual 02714 721 Digital Control Hardware Manual
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DIGITAL CONTROL
Figure 1-1. 721 Digital Speed Control

721 Digital Control Hardware Manual Manual 02714
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Figure 1-2. Hand Held Programmer

Manual 02714 721 Digital Control Hardware Manual
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Chapter 2.
Installation
Scope
This chapter contains general installation instructions for the 721 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 page ii, Electrostatic Discharge Awareness. 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 721 Digital Speed Control require a voltage
source of 88 to 132 Vac 45 to 65 Hz or 90 to 150 Vdc. The low-voltage versions
require a voltage source of 18 to 32 Vdc.
To prevent damage to the control, do not exceed the input voltage
range.
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
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.

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Internal Jumpers
The 721 control has nine, two-position internal jumpers (JPR1 through JPR18)
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 page ii, Electrostatic Discharge Awareness.
With the power off, remove the control 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 3-1).
The jumper connections are listed:
JPR1 analog output #1 0–1 mA
JPR2 analog output #1 0–20 mA
JPR3 analog output #2 0–1 mA
JPR4 analog output #2 0–20 mA
JPR5 analog output #3 0–1 mA
JPR6 analog output #3 0–20 mA
JPR8 & JPR9 actuator output 0–200 mA, single
JPR8 & JPR10 actuator output 0–20 mA, single
JPR7 & JPR9 actuator output 0–160 mA, tandem
JPR11 & JPR15 speed sensor #1 proximity switch
JPR12 & JPR16 speed sensor #1 magnetic pickup
JPR13 & JPR17 speed sensor #2 proximity switch
JPR14 & JPR18 speed sensor #2 magnetic pickup
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, EMI
Control for Electronic Governing Systems, for more information.