MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
27
5.1.2. CRANK OUTPUT
The crank output contact is a Form A dry contact and is used to control an
external crank pilot relay that directly controls the engine starter motor. Note: An
external crank pilot relay is required to energize the high current starter motor
pinion solenoid that exceeds the 10A resistive crank output contact rating. The
crank output contact closes when a crank condition is activated and the contact
will automatically open when crank disconnect speed is obtained and/or the
generators output AC voltage exceeds 10% of nominal level. The generators
output AC voltage is utilized for back-up crank disconnect protection should the
speed sensor fail.
5.2. PROGRAMMABLE OUTPUT CONTACT
The MEC 2 Controller provides four (4) standard programmable output contacts. Each
programmable output is a Form C dry contact that is programmable for many different
control functions. The programmable output may be user field programmed for the
desired control function. The following programmable features are provided:
AIR FLAP UTILITY READY TO LOAD
OIL BYPASS TIMER COMPLETE DIGITAL FAULTS #1 – #4
COMMON FAIL OVER SPEED
SWITCH NOT IN AUTO LOSS OF SPEED SIGNAL
ENGINE READY LOW BAT VOLTAGE
ENGINE RUN (FUEL) HIGH BAT VOLTAGE
PREHEAT WEAK BAT VOLTAGE
ENGINE RUNNING LOW OIL PRESS #1 ALARM
ATS TEST LOW OIL PRESS #2 SHUTDOWN
COMMON ALARM HIGH ENG TEMP #1 ALARM
COMMON SHUTDOWN HIGH ENG TEMP #2 SHUTDOWN
EPS SUPPLYING LOAD OVER VOLTAGE
OVER CURRENT OVER FREQUENCY
UNDER VOLTAGE UNDER FREQUENCY
5.2.1. ENERGIZE TO STOP
The designated programmable output relay will energize when a stop signal has
been activated. The output will remain energized for 10 seconds once the
engine has come to a complete stop, then de-energizes.
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