Woodward L-Series User manual

Installation and Operation Manual
L-Series Position Controller
Manual 26237 (Revision F)

WARNING—DANGER OF DEATH OR PERSONAL INJURY
WARNING—FOLLOW INSTRUCTIONS
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.
WARNING—OUT-OF-DATE PUBLICATION
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 Woodward website:
www.woodward.com/pubs/current.pdf
The revision level is shown at the bottom of the front cover after the publication number. The
latest version of most publications is available at:
www.woodward.com/publications
If your publication is not there, please contact your customer service representative to get
the latest copy.
WARNING—OVERSPEED PROTECTION
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.
WARNING—PROPER USE
Any unauthorized modifications to or use of this equipment outside its specified
mechanical, electrical, or other operating limits may cause personal injury and/or property
damage, including damage to the equipment. Any such unauthorized modifications: (i)
constitute "misuse" and/or "negligence" within the meaning of the product warranty
thereby excluding warranty coverage for any resulting damage, and (ii) invalidate product
certifications or listings.
CAUTION—POSSIBLE DAMAGE TO EQUIPMENT OR PROPERTY
CAUTION—BATTERY CHARGING
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—ELECTROSTATIC DISCHARGE
Electronic controls contain static-sensitive parts. Observe the following precautions to
prevent damage to these parts.
•Discharge body static before handling the control (with power to the control turned off,
contact a grounded surface and maintain contact while handling the control).
•Avoid all plastic, vinyl, and Styrofoam (except antistatic versions) around printed circuit
boards.
•Do not touch the components or conductors on a printed circuit board with your hands
or with conductive devices.
IMPORTANT DEFINITIONS
•A WARNING indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
•A CAUTION indicates a potentially hazardous situation which, if not avoided, could result in
damage to equipment or property.
•A NOTE provides other helpful information that does not fall under the warning or caution
categories.
Revisions—Text changes are indicated by a black line alongside the text.
Woodward Governor Company reserves the right to update any portion of this publication at any time.
Information provided by Woodward Governor Company is believed to be correct and reliable. However, no
responsibility is assumed by Woodward Governor Company unless otherwise expressly undertaken.
© Woodward 2003
All Rights Reserved

Manual 26237 L-Series Position Controller
Woodward i
Contents
REGULATORY COMPLIANCE ........................................................................III
ELECTROSTATIC DISCHARGE AWARENESS ................................................. IV
CHAPTER 1. GENERAL INFORMATION...........................................................1
Purpose and Scope ................................................................................................1
How to Use This Manual ........................................................................................1
Intended Applications .............................................................................................1
Introduction.............................................................................................................1
Programmable Features.........................................................................................2
Service Tool Software ............................................................................................3
CHAPTER 2. SYSTEM DESCRIPTION/APPLICATION OVERVIEW.......................4
System Operation...................................................................................................4
Communications.....................................................................................................8
Temperature Sensing .............................................................................................9
Current Limiting based on Temperature.................................................................9
Faults ......................................................................................................................9
CHAPTER 3. INSTALLATION........................................................................13
Introduction...........................................................................................................13
General Installation, Operation Notes and Requirements....................................13
Unpacking.............................................................................................................14
Mechanical Installation .........................................................................................14
Electrical Installation.............................................................................................19
Description of Electrical I/O ..................................................................................21
CHAPTER 4. SERVICE TOOL.......................................................................27
Introduction...........................................................................................................27
Description............................................................................................................27
Getting Started .....................................................................................................29
L-Series Configuration..........................................................................................30
Configuration Parameters.....................................................................................31
Position Calibration and Verification.....................................................................42
Calibration Sequence Overview ...........................................................................43
Position Verification ..............................................................................................43
CHAPTER 5. TROUBLESHOOTING...............................................................47
Introduction...........................................................................................................47
General System Troubleshooting Guide ..............................................................47
Engine/Generator Troubleshooting ......................................................................48
Electrical Troubleshooting Guide .........................................................................50
CHAPTER 6. SERVICE OPTIONS .................................................................51
Product Service Options.......................................................................................51
Returning Equipment for Repair...........................................................................52
Replacement Parts ...............................................................................................53
How to Contact Woodward...................................................................................53
Engineering Services............................................................................................54
Technical Assistance............................................................................................55
APPENDIX A. ACRONYMS/ABBREVIATIONS ................................................56
APPENDIX B. L-SERIES CONFIGURATION SUMMARY...................................57
APPENDIX C. L-SERIES CONTROL SPECIFICATIONS ...................................58
DECLARATIONS.........................................................................................62

L-Series Position Controller Manual 26237
ii Woodward
Illustrations and Tables
Figure 2-1. PWM Linear Demand to Position.........................................................6
Figure 2-2. PWM Non-Linear Demand to Position .................................................6
Figure 2-3. Analog 0–5 V Linear Demand to Position............................................7
Figure 2-4. Analog 0–5 V Non-Linear Demand to Position ....................................7
Figure 3-1. L-Series Outline Drawing ...................................................................15
Figure 3-2. L-Series Cover Types ........................................................................16
Figure 3-3a. L-Series Shaft Types........................................................................17
Figure 3-3b. L-Series Shaft Types........................................................................18
Figure 3-3c. L-Series Shaft Types........................................................................19
Figure 3-4. Typical L-Series Position Control Application Wiring.........................21
Figure 3-5. Acceptable PWM Input Types............................................................23
Figure 3-6. Relay Driver Output............................................................................24
Figure 3-7. Typical AUX1 and AUX2 Usage ........................................................25
Figure 3-8. Ground Junction Point........................................................................26
Figure 4-1. Example Service Tool Screen............................................................27
Figure 4-2a. Typical Programming Datalink Harness Wiring ...............................28
Figure 4-2b. Programming Harness Wiring..........................................................29
Figure 4-3. Configuration Selection Options ........................................................31
Figure 4-4. Configuration Editor—Analog Settings ..............................................32
Figure 4-5. Configuration Editor—PWM Settings.................................................34
Figure 4-6. Configuration Editor—Discrete Output Settings ................................35
Figure 4-7. Configuration Editor—Alarm/Shutdown Settings ...............................36
Figure 4-8. Service Tool—Overview Tab .............................................................37
Figure 4-9. Service Tool—Alarms Tab .................................................................39
Figure 4-10. Service Tool—Shutdowns Tab ........................................................40
Figure 4-11. Service Tool—Internal Shutdowns Tab ...........................................40
Figure 4-12. Service Tool—Identification Tab ......................................................41
Figure 4-13. Service Tool—PID Tuning Window..................................................42
Figure 4-14. Service Tool—PID Tuning Properties Window ................................42
Figure 4-15. Service Tool—Verify Position Calibration ........................................44
Figure 4-16. Service Tool—Manual Position Calibration......................................45
Figure 4-17. Service Tool—Manual Position Calibration Settings .......................45
Figure 4-18. Service Tool—Auto Position Calibration..........................................46
Figure C-1. Bode Plot of L-Series Response .......................................................61

Manual 26237 L-Series Position Controller
Woodward iii
Regulatory Compliance
The L-Series is suitable for use in Class I, Division 2, Groups A, B, C, D per CSA
for Canada and U.S. or non-hazardous locations only.
Wiring must be in accordance with North American Class I, Division 2 wiring
methods as applicable, and in accordance with the authority having jurisdiction.
Field wiring must be suitable for at least 105 °C.
The actuator should be protected from exposure to sunlight and rain.
These listings are limited only to those units bearing the CSA agency
identification.
WARNING—EXPLOSION HAZARD
Do not connect or disconnect while circuit is live unless area is known to be
non-hazardous.
Substitution of components may impair suitability for Class I, Division or
Zone applications.
AVERTISSEMENT—RISQUE D’EXPLOSION
Ne pas raccorder ni débrancher tant que l’installation est sous tension, sauf
en cas l’ambiance est décidément non dangereuse.
La substitution de composants peut rendre ce matériel inacceptable pour les
emplacements de Classe I, applications Division ou Zone.

L-Series Position Controller Manual 26237
iv 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.
CAUTION—ELECTROSTATIC DISCHARGE
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 26237 L-Series Position Controller
Woodward 1
Chapter 1.
General Information
Purpose and Scope
The purpose of this manual is to provide the necessary background information
for applying the L-Series control to gas/gasoline reciprocating engines. Topics
covered include mechanical installation, electrical wiring, software programming,
and troubleshooting. While this manual is primarily targeted at OEM customers,
OEMs themselves may find it useful to copy some of the information from this
manual into their application user manuals.
How to Use This Manual
The following summarizes how to install a L-Series actuator into a new or
existing system:
•Unbox and inspect the hardware.
•Mount and wire the hardware following the procedures and
recommendations in Chapter 3.
•Optionally configure the control using the Service Tool (Chapter 4).
•Optionally stroke the valve and verify dynamics and functionality.
•Troubleshooting guidelines are provided in Chapter 5.
•Specifications are provided in Appendix C.
Intended Applications
The L-Series control is designed for various industrial applications, including but
not limited to generator sets, welders, portable refrigeration units, irrigation
pumps, chipper shredders, and mobile industrial gas or gasoline reciprocating
engines. Key environmental characteristics of these applications include
extended industrial operating temperatures (–40 to +105 °C/–40 to +221 °F),
Industrial EMC Requirements, electrical transients, and lower operating voltages
(12/24 V).
Introduction
The L-Series provides a building block approach to total engine management.
The modular bi-directional actuator design easily attaches to fuel pumps, mixers,
or throttle bodies. For information on Woodward throttle body applications, refer
to manual 26249 (ITB and LC-50).
Woodward also offers L-Series actuator versions for Speed Control and Process
Control, like Air/Fuel Ratio control, applications. Refer to manuals 26250 (Speed
Control) and 26251 (Process Control).
The L-Series position control accepts a position command and drives the 0–60
degree output shaft to the commanded position based on an internal shaft
position sensor. The high-efficiency torque motor delivers 0.34 Nxm (0.25 lb-ft)
nominally over 60° travel range to operate fuel or air control devices. See the
specifications (Appendix C) for more details.

L-Series Position Controller Manual 26237
2 Woodward
The L-Series position control accepts either a PWM command or a 0–5 V
command for output positioning. The command signals are issued by the
appropriate supervisory engine management system, and the L-Series must be
set up properly in software to expect the correct signal for the application.
For status purposes, a relay driver output is available on the L-Series control
which changes state whenever a fault or error condition is experienced by the
L-Series controller.
If the system so requires, the L-Series provides a direct position output signal in
the form of a dc voltage. The throttle position (TPS) output represents full
counterclockwise (ccw) to clockwise (cw) rotation of the actuator shaft, and thus
gives the operator an external position indication after installation and while the
unit is operating.
More detail on the features of the L-Series can be found later in this manual.
WARNING—EMERGENCY STOP
When included with an ITB, the actuator depends solely on the return spring
inside the throttle body assembly to drive toward minimum fuel when not
powered, therefore other positive shutdown devices like fuel shut-off
solenoids are recommended to ensure shutdown upon loss of signal to the
control system. Also, separate overspeed trip devices are always
mandatory.
Programmable Features
Control setup and tuning is accomplished through the use of a PC (personal
computer), Woodward Service Tool software, and a programming harness. The
features identified below are described in Chapters 2 and 4. Briefly, the
programmable features include:
•4 General Setup Parameters
o Position Demand Select (PWM or Analog)
o Fail Direction (ccw or cw)
o Min Position Direction (ccw or cw)
o Actuator Curve Selection (Linear or Non-linear)
•PWM Setup Parameters
o PWM Drive Select (Push-Pull, High-Side Drive or Low-Side Drive)
o PWM Offset
•4 Valve Position Control Parameters
o Proportional Gain
o Integral Gain
o Derivative Gain
o Friction/Dither Setting
•10 Non-Linear Actuator Settings
o Position Request (5 curve input points)
o Actuator Position (5 curve output points)
•12 Discrete Output Settings
o Output’s Non-Fault Condition (ON or OFF)
o 11 Selections as Discrete Output Indications
•10 Fault Settings
o Latching or Non-Latching Fault Indications
o Position Error Magnitude
o Position Error Delay
o 7 Fault Selections as Alarms or Shutdowns

Manual 26237 L-Series Position Controller
Woodward 3
Service Tool Software
The L-Series Service Tool software is a Microsoft Windows based GUI (graphic
user interface). The Service Tool Software is compatible with Windows
95/98/NT/00 and gives the OEM the ability to:
•Configure product settings based on application requirements
•Tune the control with the engine running during application development
•Create configuration files for downloading into multiple controls
•Download configuration files
•Extract and view fault codes for field diagnosis
•Update control dynamics during field service
•Calibrate the control for user stops
Detailed descriptions of software installation are available in Chapter 4.

L-Series Position Controller Manual 26237
4 Woodward
Chapter 2.
System Description/Application Overview
System Operation
The L-Series actuator is ready for operation immediately (within 0.25 second)
when the power supply is connected. Power may be connected to the control at
the same time the engine starter motor is engaged. Upon power-up, the actuator
will immediately go to the commanded position. The actuator will then drive to
maintain the position commanded by the supervisory control.
Optionally, a Run Enable input can be used to activate or de-activate the
L-Series output. It can also be used to reset shutdown fault conditions.
Upon an engine shutdown command, the independent engine shutdown solenoid
or solenoid valve in the fuel supply should be de-activated and the power supply
disconnected from the speed control. This shutdown signal should be sent
directly from the engine control panel and should be independent and separate
from the L-Series controller.
Customer
Controller L-Series
Run Enable
Status
Power Input
(10-32Vdc)
Service Tool
RS-232
Actual Position (0-5V)
Position Demand
(Analog/PWM)
Driver Input Power
The L-Series will handle a voltage range of 10 to 28 Vdc at full specified torque.
The actuator is functional in the range of 8 to 32 Vdc, but accuracy and/or torque
can be diminished at the extreme ends of this range.
The supply voltage failure levels are below 6.25 V and above 33 V. The unit can
be configured to either alarm or shutdown upon detection of a supply voltage
fault.

Manual 26237 L-Series Position Controller
Woodward 5
Serial
Communications
LCS Position Control Functional Overview
12/24V Input Power
(8-32 Vdc) Scaling &
Fault
Detection Fault Logic
Fault
Status
(discrete output driver)
24Vdc = ON (status ok)
Position
Demand
Selection
(configured)
Position
Controller
Motor
PWM
Driver
Scaling &
Fault
Detection
Tuning
LAT
Motor
Scaling &
Fault
Detection
Anlg Dmd
Fault
Scaling &
Fault
Detection
PWM Dmd
Fault
Analog Demand
(0.5-4.5 V)
PWM Demand
10-90% Duty
6-26 Vdc
300-1500 Hz
Calibration Settings
S
Discrete
Out Logic
F (any fault)
Pos’n
Sensor
De-code
TPS
Act’l Position Ouput
(0.75-4.25 V for CW-CCW)
Aux 2
Pwm +
F
F
Aux 4
Aux 3
+V
Relay
+12/24V
TPS
Discrete
Out
F (any fault)
Configuration Settings
S (shutdown)
A (alarm)
Linear/
NonLinear
5-pt curve
Scaling &
Fault
Detection
On-Board
Temp Sensor
Current
Limters
Fault F
OverTemp F
RS232
Service Port
Logic
Linearizatoin
Direction
CW /
CCW
User
Scaling
F
Run Enable
(optional)
Position Command Signal
The L-Series can accept either a PWM command signal input or an analog 0–5
Vdc command signal input, depending on how the software application is
configured.
The PWM will function with various types of input sources, including high-side,
low-side open collector, and push-pull—depending on the configuration. It will
handle a PWM frequency range from 300 to 1500 Hz at amplitudes ranging from
5 V up to battery voltage. Normal operating range is from 10% to 90% duty cycle,
representing the hard stops in the actuator (Figure 2-1). The input can be
optionally set to a non-linear mode which provides a 5-point curve relationship
between position signal and desired position (Figure 2-2).
The input failure levels are below 3% and above 97% duty cycle. The unit can be
configured to either alarm or shut down on detection of a position command
failure. The shutdown failsafe direction is also user configurable as either
clockwise or counterclockwise.
A user-configurable offset is available to adjust the input duty-cycle reading, as
needed.

L-Series Position Controller Manual 26237
6 Woodward
Figure 2-1. PWM Linear Demand to Position
Figure 2-2. PWM Non-Linear Demand to Position
The 0–5 V input uses a different pin in the connector, and it has a usable range
of 0.5 to 4.5 V to command the throttle from minimum to maximum position
(Figure 2-3). The input can be optionally set to a non-linear mode which provides
a 5-point curve relationship between position signal and desired position (Figure
2-4).
The input failure levels are below 0.2 and above 4.8 V. The unit can be
configured to either alarm or shut down on detection of a position command
failure. The shutdown failsafe direction is also user-configurable as either
clockwise or counterclockwise direction.
0
10
20
30
40
50
60
70
80
90
100
0 102030405060708090100
Desired Actuator Position, %
PWM Position Signal Duty Cycle, %
user-defined shutdown
failsafe direction
user-defined
shutdown
failsafe direction
0
10
20
30
40
50
60
70
80
90
100
0 102030405060708090100
Desired Actuator Position, %
PWM Position Signal Duty Cycle, %
user-defined shutdown
failsafe direction
user-defined points

Manual 26237 L-Series Position Controller
Woodward 7
Figure 2-3. Analog 0–5 V Linear Demand to Position
Figure 2-4. Analog 0–5 V Non-Linear Demand to Position
Discrete Output
A discrete output is provided to serve as a status indicator. This switchable
discrete output is a closure to ground capable of sinking 250 mA with an output
voltage rise of less than 1.5 V, and it is available to power external relays for
devices such as alarms or fuel shutoff solenoids. The circuit is protected
internally against overcurrent and inductive spikes, so external clamping is not
necessary.
This output can be configured to be either normally on/open (preferred failsafe
setting) or normally off/closed. In addition, the faults that drive the relay status
can be configured individually. For details refer to Chapter 4 (Service Tool).
0
10
20
30
40
50
60
70
80
90
100
00.511.522.533.544.55
Desired Actuator Position, %
Position Signal Voltage
user-defined shutdown
failsafe direction
user-defined shutdown
failsafe direction
0
10
20
30
40
50
60
70
80
90
100
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Desired Actuator Position, %
Position Signal Voltage
user-defined shutdown
failsafe direction
user-defined points

L-Series Position Controller Manual 26237
8 Woodward
There are two conditions that will prevent the discrete output from operating
correctly. The first is if battery positive is accidentally connected to it, and the
second is if it is shorted to ground. The circuit will protect itself in the event of a
mis-wire, but it will hold the output open(floating) until the fault is removed.
Run Enable Discrete Input
An optional Run Enable discrete input can be configured for use. The Run
Enable operation provides a closed-to-run and an open to force the shaft
controller into a low-current “limp” mode. The Run Enable can also be used to
clear a latching shutdown condition since a closure of the input will issue a reset
command.
Actual Position Feedback (TPS)
The L-Series provides a 0–5 V signal representing actual shaft rotational
position, where 0.75 V and 4.25 V correspond to full counterclockwise to
clockwise rotation, respectively. This signal is fed directly off the position sensor
to ensure no delays are introduced by the processor. However, this signal is also
uncorrected, so the difference between this signal and actual position can vary
up to ±10% over the operating temperature range.
Additional Inputs/Outputs
Auxiliary Inputs—There are four auxiliary inputs on the L-Series controller, all of
which are capable of both analog and discrete functions. They can all be
functionally defined for purpose in the software application. Although they are
very flexible, two of them are shared with the serial communications, so will be
unavailable if the L-Series is connected to the Service Tool. More detail
concerning the auxiliary inputs is provided in Chapter 3 (Installation).
5V Output—A 5 Vdc output has been provided on the L-Series actuator to power
external sensors, if necessary. The 5 V output is limited to 10 mA, but this is
sufficient for most light-duty ratiometric sensors.
Communications
RS-232 communications are available on the L-Series when used with an
external transceiver connected to pins 4 and 6. Serial communications allow for
the use of a service and configuration tool with the L-Series actuator. The
simplest way to establish this interface is to use Woodward kit # 8923-1061.
Functions available through this port include tuning, monitoring, and configuration
of the position controller. Detailed driver status information is also available.
Any RS-232 wiring must meet the requirements in the EIA RS-232 Standard
document. The RS-232 standard states that the length of the RS-232 cable
between the driver and the PC must be less than 50 ft (15 m) with a total
capacitance less than 2500 pF. The RS-232 data rate is fixed at 19.2 kbps. The
communication port is non-isolated and susceptible to both EMI noise and
ground loops related to PC connections and typical industrial environments.

Manual 26237 L-Series Position Controller
Woodward 9
NOTE
The service port is not isolated and is not intended to function while the
prime mover is in normal operation. The service port is provided for
configuration and setup only.
Temperature Sensing
The L-Series has an on-board temperature sensor to monitor board temperatures
and protect the unit from overtemperature. This temperature is monitored and a
fault is annunciated if the set point is exceeded.
Current Limiting based on Temperature
The controller provides actuator current limiting based on the electronics
temperature. Dependent on board and actuator thermal models, the software
reduces current as necessary to avoid conditions that would damage the device
due to extreme temperatures.
Current limiting based on temperature begins when the combined current and
temperature environment causes board temperatures greater than 117 °C. The
limit curve is a linear derate from full current at 117 °C down to zero current at
125 °C. At 125 °C, an OverTemp fault is annunciated. Depending on the current
(actuator torque) and ambient operating temperatures, the unit may never reach
a reduced level.
Faults
Faults are separated into two categories: Logged Faults and Current Faults. The
Current Faults are volatile and reset every time power is applied. The Current
Faults annunciates faults that are presently active/detected; they may latch or not
latch depending on the fault. All latching Current Faults are reset by a power
cycle or Service Tool reset. All logged faults are latched and written to the
EEPROM. They must be cleared through the Service Tool.
A fault can have three effects on the control: change the discrete output state
(Alarm), Shutdown–drive to fail direction and change the discrete output state
(Alarm), or Shutdown–go limp and change the discrete output state (Alarm). A
parameter is available to configure the fault to either an alarm or a shutdown.
The shutdown action performed (go limp or drive to fail direction) is fault-
dependent. Some faults are dedicated shutdowns and cannot be configured—
they are identified as such below. A "go limp" command overrides a "drive to fail
position" if more than one fault is set.
Faults can be configured as either latching or non-latching. This is a general
setting that applies to all faults, unless otherwise noted. When configured as non-
latching, a Reset is not needed. If latching mode is configured, a Reset or power-
cycle is required to clear the fault and resume positioning.
Watchdog Reset
Watchdog Reset is true if a watchdog timer timeout occurred which resulted in a
reset of the microprocessor. This is a hard-coded alarm. If detected, the control
will attempt to continue normal operation.

L-Series Position Controller Manual 26237
10 Woodward
Brownout Reset
Brownout Reset is true if CPU Voltage drops below 4.2 V but not below 1 V. The
brownout detect circuit will reset the CPU. This is a hard-coded alarm. If
detected, the control will attempt to continue normal operation.
EEPROM Fail
EEPROM Fail indicates failure or corruption of the internal non-volatile memory.
If the CRC is not correct for the EEPROM data, this fault will be set true. This is a
hard-coded internal shutdown. If detected, the control output will go limp. A
power cycle is required to clear this fault.
Position Sense Fail
This indicates a failure of the internal Position Sensor. This is a hard-coded
internal shutdown. If detected, the control output will drive to the Fail Direction
using current control. This fault latches and requires a reset or power cycle to
clear.
Failure levels: >4.75 V and < 0.25 V
Persistence: 650 ms
Voltage Sense Fail
Indicates an out-of-range signal on the input power. Could indicate input power
out of range or a fault in the supply voltage sense circuitry.
Failure levels: >33 V and <6.25 V
Persistence: 650 ms
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will drive to Fail Direction (using current control) if this fault is detected. If
configured as an alarm, the control will internally default to an assumed 32 V
power supply voltage (decreased torque at lower actual voltages) and attempt to
continue normal operation if this fault is detected. The value displayed on the
Service Tool will show sensed value, not default.
Temp Sense Fail
Indicates a failure of the internal on-board Temperature Sensor.
Failure levels: >150 °C and <–45 °C
Persistence: 650 ms
Hysteresis: 5 °C (<145 °C or >–40 °C to clear)
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will drive to Fail Direction (using position control) if this fault is detected. If
configured as an alarm, the control will internally default to 25 °C and attempt to
continue normal operation if this fault is detected. The value displayed on the
Service Tool will show sensed value, not default.
OverTemp
If the on-board temperature sensor reads above 125 °C, this error will be set.
Above 125 °C, the processor can fail in an unpredictable manner, so this fault is
recommended as a shutdown. The Current Limiting based on temperature will
effectively make the output "limp" by reducing the drive current to zero.
Failure levels: >125 °C
Persistence: 650 ms
Hysteresis: 5 °C (<120 °C to clear)

Manual 26237 L-Series Position Controller
Woodward 11
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will go limp if this fault is detected. If configured as an alarm, the control
will attempt to continue normal operation if this fault is detected.
Position Error
Position Error detection logic will indicate a difference between commanded
position and actual position exceeded for longer than the set delay. The error
magnitude and duration are customer-configurable parameters.
Failure levels: Set by customer variable, Error > |PosErrorMax|
Persistence: Set by customer variable, Position Error Delay.
Hysteresis: none
Override: Whenever the current is being limited to a factor of 1/2 normal
maximum or less. This would be because of high temperature (see section on
Temp Sensing and Current Limiting) or a shutdown that causes the output to go
"limp".
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will drive to Fail Direction (using position control) if this fault is detected. If
configured as an alarm, the control will attempt to continue normal operation if
this fault is detected.
Relay Output Shorted
The relay driver is thermally protected against wiring errors. If incorrectly wired,
the output will turn off and then set the Error Bit.
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will drive to Fail Direction (using position control) if this fault is detected. If
configured as an alarm, the control will attempt to continue normal operation if
this fault is detected.
PWM Input Failed (Position Demand Failed)
PWM Input Failed is only active when the position demand is configured for
'PWM'.
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will drive to Fail Direction (using position control) if this fault is detected. If
configured as an alarm, the control will attempt to continue normal operation if
this fault is detected.
Failure levels: >97% Duty and < 3% Duty
Persistence: 250 ms
Hysteresis: 1% (<96% or >4% to clear)
0..5 V Analog (Aux2) Input Failed (Position Demand Failed)
Analog (Aux2) Input Failed is only active when the position demand is configured
for '0..5 V'.
Can be configured as an alarm or shutdown. If configured as a shutdown, the
control will drive to Fail Direction (using position control) if this fault is detected. If
configured as an alarm, the control will attempt to continue normal operation if
this fault is detected.
Failure levels: >4.8 V and < 0.2 V
Persistence: 650 ms
Hysteresis: 0.05 V (<4.75 V or >0.025 V to clear)

L-Series Position Controller Manual 26237
12 Woodward
Run Enable Shutdown
Run Enable discrete input is opened, only active when this input is configured for
use.
This is a hard-coded shutdown. The control will go limp if this condition is
detected.

Manual 26237 L-Series Position Controller
Woodward 13
Chapter 3.
Installation
Introduction
This chapter provides instructions on how to mount and connect the L-Series
controller into a system. Hardware dimensions are provided for mounting the
device to a specific application.
WARNING—NOISE
Due to typical noise levels in turbine or engine environments, hearing
protection should be worn when working on or around the L-Series.
WARNING—BURN HAZARD
The surface of this product can become hot enough or cold enough to be a
hazard. Use protective gear for product handling in these circumstances.
Temperature ratings are included in the specification section of this manual.
WARNING—EXPLOSION HAZARD
Do not connect or disconnect while circuit is live unless area is known to be
non-hazardous.
Substitution of components may impair suitability for Class I, Division or
Zone applications.
CAUTION—FIRE PROTECTION
Explosion Hazard—External fire protection is not provided in the scope of
this product. It is the responsibility of the user to satisfy any applicable
requirements for their system.
CAUTION—WIRING
Due to the hazardous location listings associated with this product, proper
wire type and wiring practices are critical to operation.
Do not connect any cable grounds to “instrument ground”, “control
ground”, or any non-earth ground system. Make all required electrical
connections based on the wiring diagrams (Figure 3-4).
General Installation, Operation Notes and
Requirements
WARNING—SAFETY CONSIDERATIONS
Use an independent device for positive shutdown, such as a fuel shut off
valve is highly recommended. Failure to comply with this recommendation
can cause personal injury and/or property damage.
Use of an external spring to return to minimum fuel is highly recommended.
Failure to comply with this recommendation can cause personal injury
and/or property damage.
Use of a predicted min fuel shutdown procedure is highly recommended.
Failure to comply with this recommendation can cause personal injury
and/or property damage.

L-Series Position Controller Manual 26237
14 Woodward
Unpacking
Be careful when unpacking the actuator. Check the unit for signs of damage,
such as bent or dented panels, scratches, and loose or broken parts. Notify the
shipper and Woodward if damage is found.
Mechanical Installation
Mounting Location
Locate the L-Series control a distance from sources of extreme radiant heat,
such as exhaust manifolds or turbochargers. The operating temperature range of
the control is –40 to +105 °C (–40 to +221 °F). In spark-ignited applications,
make sure the L-Series is located away from the ignition coil, and that harness
wires are not routed next to the spark plug wires.
Mounting Orientation
While it is not a requirement, it is good practice to orient the connector feature on
the control in a horizontal or downward orientation to minimize fluid accumulation
between the enclosure and the mating connector’s gasket.
Actuator Configuration
The L-Series actuator utilizes a 2” (51 mm) square mounting bolt pattern and is
intended to fit within an envelope of 2.618 x 2.618 x 2.540 (66.50 x 66.50 x 64.52
mm) with the short dimension along the shaft axis. Two shaft seal configurations
are available, an internal lip seal and an external lip seal with spring backup
(Figure 3-2). In addition, six independent output shaft configurations are available
(Figure 3-3). Consult Woodward Applications Engineering for the application
appropriate seal and shaft configuration.
Mounting Hardware
Use #10 or M5 fasteners to attach the L-Series control to the mounting bracket.
The bracket and attaching hardware must be designed to hold the weight and to
withstand the vibration associated with prime mover mounting. Use the
appropriate fasteners for securing the mounting bracket to the engine.