Woodward SECM112 User manual

EC-US-L1
Product Manual 26634
(Revision C, 03/2022)
Original Instructions
SECM112 Digital Control
Vehicular Applications
Hardware Only
Installation Manual

EC-US-L1
General
Precautions
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.
Revisions
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
the publications page of the Woodward website:
http://www.woodward.com
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.
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.
Translated
Publications
If the cover of this publication states "Translation of the Original Instructions"
please note:
The original source of this publication may have been updated since this
translation was made. Be sure to check manual 26455, Customer Publication
Cross Reference and Revision Status & Distribution Restrictions, to verify whether
this translation is up to date. Out-of-date translations are marked with . Always
compare with the original for technical specifications and for proper and safe
installation and operation procedures.
Revisions—A bold, black line alongside the text identifies changes in this publication since the
last revision.
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 26634
Copyright © Woodward, Inc. 2013-2022
All Rights Reserved

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Contents
WARNINGS AND NOTICES ...............................................................................................................3
REGULATORY COMPLIANCE............................................................................................................5
ELECTROSTATIC DISCHARGE AWARENESS......................................................................................6
CHAPTER 1. GENERAL INFORMATION..............................................................................................7
Introduction ...................................................................................................................................................7
Environmental Requirements........................................................................................................................7
CHAPTER 2. SECM112 INSTALLATION............................................................................................9
Mounting........................................................................................................................................................9
CHAPTER 3PRODUCT SUPPORT AND SERVICE OPTIONS ...............................................................15
Product Support Options.............................................................................................................................15
Product Service Options .............................................................................................................................15
Returning Equipment for Repair .................................................................................................................16
Replacement Parts......................................................................................................................................16
Engineering Services..................................................................................................................................17
Contacting Woodward’s Support Organization...........................................................................................17
Technical Assistance ..................................................................................................................................18
REVISION HISTORY .......................................................................................................................19

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Illustrations and Tables
Figure 1-1. Location of Accelerometer to Measure Mounting Vibration .......................................................8
Figure 1-2. Random Vibration Spectrum ......................................................................................................8
Figure 2-1. SECM112 Isolators.....................................................................................................................9
Figure 2-2. SECM112 Outline.....................................................................................................................10
Figure 2-3. Preferred SECM112 Mounting Orientations.............................................................................11
Figure 2-4. Acceptable SECM112 Mounting Orientations..........................................................................11
Figure 2-5. Not Recommended SECM112 Mounting Orientations.............................................................11
Figure 2-6. Harness Clearance...................................................................................................................12
Figure 2-7. SECM Connector Orientations.................................................................................................12
Figure 2-8. Connector Physical Pinout .......................................................................................................13
Table 1-1. SECM112 Part Numbers.............................................................................................................7
Table 2-1. Connector System Part Numbers..............................................................................................13
Table 2-2. Connector Kit.............................................................................................................................14

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Warnings and Notices
Important Definitions
This is the safety alert symbol 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.
Lockout/Tagout
Ensure that personnel are fully trained on LOTO procedures prior to
attempting to replace or service equipment on a “live” running
engine. All safety protective systems (overspeed, over temperature,
overpressure, etc.) must be in proper operational condition prior to
the start or operation of a running engine. Personnel should be
equipped with appropriate personal protective equipment to
minimize the potential for injury due to release of hot hydraulic
fluids, exposure to hot surfaces and/or moving parts, or any moving
parts that may be activated and are located in the area of control of
the equipment.
Overspeed /
Overtemperature /
Overpressure
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.
Personal Protective
Equipment
The products described in this publication may present risks that
could lead to personal injury, loss of life, or property damage.
Always wear the appropriate personal protective equipment (PPE) for
the job at hand. Equipment that should be considered includes but is
not limited to:
•Eye Protection
•Hearing Protection
•Hard Hat
•Gloves
•Safety Boots
•Respirator
Always read the proper Material Safety Data Sheet (MSDS) for any
working fluid(s) and comply with recommended safety equipment.
Start-up
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.

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Automotive
Applications
On- and Off-Highway Mobile Applications: Unless Woodward's
control functions as the supervisory control, customer should install
a system totally independent of the prime mover control system that
monitors for supervisory control of engine (and takes appropriate
action if supervisory control is lost) to protect against loss of engine
control with possible personal injury, loss of life, or property
damage.
IOLOCK
IOLOCK: driving I/O into a known state condition. When a control
fails to have all the conditions for normal operation, watchdog logic
drives it into an IOLOCK condition where all output circuits and
signals will default to their de-energized state as described below.
The system MUST be applied such that IOLOCK and power OFF
states will result in a SAFE condition of the controlled device.
•Microprocessor failures will send the module into an IOLOCK
state.
•Discrete outputs / relay drivers will be non-active and
de-energized.
•Analog and actuator outputs will be non-active and de-energized
with zero voltage or zero current.
Network connections like CAN stay active during IOLOCK. This is up
to the application to drive actuators controlled over network into a
safe state.
The IOLOCK state is asserted under various conditions, including:
•Watchdog detected failures
•Microprocessor failure
•PowerUp and PowerDown conditions
•System reset and hardware/software initialization
•PC tool initiated
NOTE—Additional watchdog details and any exceptions to these
failure states are specified in the related section of the product
manual.
Battery Charging
Device
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.

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Regulatory Compliance
International Compliance
UNECE Type approved to UNECE Regulations 10, 67, and 110.

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Electrostatic Discharge Awareness
Electrostatic
Precautions
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.
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.
Follow these precautions when working with or near the control.
1. 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.
2. Touch your finger to a grounded surface to discharge any potential before touching the LECM or
installing cabling connectors. Alternatively, ESD mitigation may be used as well: ESD smocks, ankle
or wrist straps and discharging to a reference grounds surface like chassis or earth are examples of
ESD mitigation.
•ESD build up can be substantial in some environments: the unit has been designed for
immunity deemed to be satisfactory for most environments. ESD levels are extremely
variable and, in some situations, may exceed the level of robustness designed into the
control. Follow all ESD precautions when handling the unit.
oI/O pins within connectors have had ESD testing to a significant level of immunity to
ESD, however do not touch these pins if it can be avoided.
▪Discharge yourself after picking up the cable harness before installing it as a
precaution.
oThe unit is capable of not being damaged or improper operation when installed to a
level of ESD immunity for most installation as described in the specifications.
Mitigation is needed beyond these specifications.
External wiring connections for reverse-acting controls are identical
to those for direct-acting controls.

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Chapter 1.
General Information
Introduction
Scope
The intent of this document is to detail the installation requirements of the 112-pin Small Engine Control
Module (SECM112). This module was previously referred to as ECM-OH (On-Highway). Active SECM112
part numbers are listed in Table 1-1.
Table 1-1. SECM112 Part Numbers
Module
Description
SECM112 MY12
1751-6601
MODULE - ECM-OH-01C OH6 CALIBRATIBLE CONTROL MODULE (MPC5644)
1751-6605
MODULE - ECM-OH-01 OH6 PRODUCTION CONTROL MODULE (MPC5642)
1751-6605-XX
MODULE - ECM-OH-01 OH6 PRODUCTION CONTROL MODULE (MPC5642)
1751-6605-XXX
MODULE - ECM-OH-01 OH6 PRODUCTION CONTROL MODULE (MPC5642)
SECM112 MY18
1751-6812
MODULE - SECM112 6-IGBT & 6-INJ PRODUCTION
1751-6813
MODULE - SECM112 6-IGBT, H3 & NO INJ. PRODUCTION
1751-6814
MODULE - SECM112 6-IGBT, H3 & 4-INJ PRODUCTION
1751-6815
MODULE - SECM112 6-IGBT & 6-INJ CALIBRATION
1751-6816
MODULE - SECM112 6-IGBT, H3 & NO INJECTORS CALIBRATION
1751-6817
MODULE - SECM112 6-IGBT, H3 & 4-INJ CALIBRATION
SECM112 MY20
1751-6852
MODULE –SECM112 6-IGBT, H3 & NO INJ, AN34-37 (MPC5644)
1751-6854
MODULE –SECM112 6-IGBT, 6-INJ, AN34-37 (MPC5644)
1751-6862*
MODULE - SECM112 6-IGBT & 6-INJ, AN34-37 CUSTOM, CAL (MY20)
1751-6863*
MODULE - SECM112 6-IGBT, H3 & 4-INJ, AN34-37, CUSTOM, CAL (MY20)
1751-6864*
MODULE - SECM112 6-IGBT, H3 & NO INJECTORS, AN34-37, CAL, NO CAN3
TERM (MY20)
XX and XXX –Alpha characters designated for specific customer’s application
(*) MY20 Customer specific part numbers
Overview
The SECM112 is a full-authority engine control module capable of withstanding the environment within
the engine compartment and either on- or off-engine mounting. The 4 mounting feet on the controller
were designed to accept specific rubber grommets and aluminum bushings to provide both vibration
isolation and electrical isolation of the module case from chassis ground. This mounting hardware is pre-
installed on the part numbers listed above.
Environmental Requirements
Vibration and Shock
The SECM112 is designed for engine mount operation with the vibration isolators. If the SECM112 is
mounted on a bracket not provided by Woodward, the bracket needs to be evaluated in the application. It
is possible for a bracket resonance to be incompatible with the SECM112 product, causing premature
failure of the module.
The vibration integrity of the SECM112 for a given installation can be verified by measuring the vibration
spectrum of an installed unit when the engine / vehicle is operated under worst-case vibration conditions.

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The vibration spectrum needs to be measured with an accelerometer on the SECM112 mounting foot as
shown in Figure 1-1. If the measured spectrum is within the RV3 de-rated spectrum illustrated in red in
Figure 1-2, the mounting location is acceptable for vibration.
Figure 1-1. Location of Accelerometer to Measure Mounting Vibration
The harness must be firmly secured at a tie-down length not to exceed 150 mm from the center of the
connectors.
Random Vibration
The SECM112 shall survive Woodward’s RV3 random vibration specification (22.1 Grms / 3 hours per
axis) per Woodward procedure 3-04-6231. The RV3 random vibration profile is illustrated in Figure 1-2
(blue line). A de-rated installation RV3 vibration for an estimated 7-year life is shown in red.
Figure 1-2. Random Vibration Spectrum
Temperature
The SECM112 is designed to be thermally isolated from the mounting surface and relies on air
convection for cooling based on a minimum air flow at the worst-case operation mode. The following
ratings apply to the SECM112 when installed properly:
•Ambient Operating Temperature: –40 °C to +105 °C
•Minimum Operating Airflow: 2 m/s
•Heat Soak Maximum Temperature: +125 °C
Customers can verify the temperature in the desired mounting location by placing a thermocouple in the
air near the operating SECM112. If the external ambient conditions are not worst-case, this needs to be
taken into consideration when measuring the SECM112 package temperature. If the measured air
temperature when operating at worst-case (fastest) engine speed and worst-case (hottest) ambient
conditions is less than 105 °C, the mounting location thermal stress is acceptable for the SECM112.
Accelerometer location
0.001
0.01
0.1
1
10
100
1000
10000
Frequency (Hz)
PSD (G^2 / Hz)
Validation Spectrum
Installation Spectrum –
7 Year Life