Woodward SECM70 User manual

EC-US-L1
Product Manual
26784
(Revision D, 07/2022
)
Original Instructions
SECM70 Digital Control
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 Out-of-date translations are marked with .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 26784
Copyright © Woodward, Inc. 2014-2022
All Rights Reserved

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Contents
WARNINGS AND NOTICES ...............................................................................................................3
ELECTROSTATIC DISCHARGE AWARENESS...................................................................................... 5
CHAPTER 1. INTRODUCTION ............................................................................................................6
CHAPTER 2. ENVIRONMENTAL REQUIREMENTS................................................................................7
Vibration and Shock ...................................................................................................................................... 7
Temperature.................................................................................................................................................. 8
CHAPTER 3. PACKAGING ................................................................................................................9
Isolators......................................................................................................................................................... 9
Outline Drawings......................................................................................................................................... 10
Orientation................................................................................................................................................... 11
Connector Information................................................................................................................................. 12
CHAPTER 4PRODUCT SUPPORT AND SERVICE OPTIONS ...............................................................13
Product Support Options............................................................................................................................. 13
Product Service Options ............................................................................................................................. 13
Returning Equipment for Repair ................................................................................................................. 14
Replacement Parts...................................................................................................................................... 14
Engineering Services .................................................................................................................................. 15
Contacting Woodward’s Support Organization........................................................................................... 15
Technical Assistance .................................................................................................................................. 16
REVISION HISTORY .......................................................................................................................17
The following are trademarks of Woodward, Inc.:
•SECM70
The following are trademarks of their respective companies:
•TE (TE Connectivity Corporation)
•Molex (Molex, LLC)

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Illustrations and Tables
Figure 2-1. Location of Accelerometer to Measure Mounting Vibration ....................................................... 7
Figure 2-2. Random Vibration Spectrum ...................................................................................................... 7
Figure 3-1: SECM70 Isolators....................................................................................................................... 9
Figure 3-2: SECM70 Outline Drawing......................................................................................................... 10
Figure 3-3. Preferred Mounting Orientation ................................................................................................ 11
Figure 3-4. Acceptable Mounting Orientation ............................................................................................. 11
Figure 3-5. Mounting Orientation Not Recommended ................................................................................ 11
Table 1-1. SECM70 Part Numbers ............................................................................................................... 6
Table 3-1. Vibration Isolator Part Numbers................................................................................................... 9
Table 3-2. Connector System Part Numbers.............................................................................................. 12

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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
LOTO
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 unit.
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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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 control, smart
valve, or valve driver, 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 or any electronics.
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 EMC specifications.
Mitigation is needed beyond these specification levels.
External wiring connections for reverse-acting controls are identical
to those for direct-acting controls.

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Chapter 1.
Introduction
The SECM70 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 are
designed to accept specific rubber grommets and aluminum bushings to provide both vibration isolation
as well as electrical isolation of the module case from chassis ground. This mounting hardware can be
purchased separately or ordered pre-installed on the part numbers listed above.
The purpose of this manual is to detail the installation requirements of the 70-pin Small Engine Control
Module (SECM70).
Part numbers for both production and development SECM70 units are shown in Table 1-1.
Table 1-1. SECM70 Part Numbers
Model No. Part No. Kit No.
MY15 PRODUCTION UNITS
MI-1562
1751-6719
8923-2253
MI-1563
1751-6720
8923-2254
MI-1565
1751-6722
8923-2256
MI-1566
1751-6723
8923-2257
MI-1569
1751-6756
8923-2475
MY15 DEVELOPMENT UNITS
MI-1512
1751-6713
8923-2258
MI-1513
1751-6714
8923-2259
MI-1515
1751-6716
8923-2261
MI-1516
1751-6717
8923-2262
MI-1609
1751-6755
8923-2474
MY17 PRODUCTION UNITS
MI-1752
1751-6767
8923-2583
MI-1753
1751-6768
8923-2587
MI-1754
1751-6769
8923-2581
MI-1755
1751-6770
8923-2585
MI-1756
1751-6771
8923-2579
MI-1759
1751-6784
8923-2577
MY17 DEVELOPMENT UNITS
MI-1702
1751-6772
8923-2584
MI-1703
1751-6773
8923-2588
MI-1704
1751-6774
8923-2582
MI-1705
1751-6776
8923-2586
MI-1706
1751-6777
8923-2580
MI-1709
1751-6785
8923-2578

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Chapter 2.
Environmental Requirements
Vibration and Shock
The SECM70 is designed for engine mount operation with the vibration isolators. If the SECM70 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 SECM70 product, causing premature failure of the
module.
The vibration integrity of the SECM70 for a given installation can be verified by measuring the vibration
spectrum of an installed unit when the engine / vehicle is operated under worse case vibration conditions.
The vibration spectrum needs to be measured with an accelerometer on the SECM70 mounting foot as
shown in Figure 2-1. If the measured spectrum is within the RV3 de-rated spectrum illustrated in red in
Figure 2-2, the mounting location is acceptable for vibration.
Figure 2-1. 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 SECM70 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 2-2
(blue line). A de-rated installation RV3 vibration for a 7-year life is shown in red.
0.001
0.01
0.1
1
10
100
1000
10000
Frequency (Hz)
PSD (G^2 / Hz)
Validation Spectrum
Installation Spectrum –
7 Year Life
Figure 2-2. Random Vibration Spectrum

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Temperature
The SECM70 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 SECM70 when installed properly:
Ambient Operating Temperature: –40 to +105 °C
Minimum Operating Airflow: 2 m/s
Heat Soak / Storage Temperature Range: –40 to +125 °C
Customers can verify the temperature in the desired mounting location by placing a thermocouple in the
air near the operating SECM70. If the external ambient conditions are not worse case, this needs to be
taken into consideration when measuring the SECM70 package temperature. If the measured air
temperature when operating at worse case (fastest) engine speed and worse case (hottest) ambient
conditions is less than 105 °C, the mounting location thermal stress is acceptable for the SECM70.
Thermal Survey
The SECM70 thermal performance shall be evaluated with a thermal survey that measures the case
temperatures of critical power components under various operating conditions. The thermal survey is
used to ensure that under worse case thermal and operating conditions electrical component ratings are
not exceeded.