MEC 2 MICROPROCESSOR ENGINE/GENERATOR CONTROLLER
PM056 Rev 6 05/10/15 Thomson Technology
45
8.3.5.2.UTILITY POWER FAILURE CONDITIONS:
• Remote Start input signal is activated (i.e. remote start contact closes
when utility power fails, as sensed by utility voltage sensor).
• Engine starts following expiry of the Engine Start Delay timer (Utility
Ready To Load output stays energized).
• Once the engine has started and the generator output rises above the
programmed voltage and frequency limits, a Warmup timer is initiated.
• Once the Warmup timer expires the Utility Ready to Load output de-
energizes and the NEUTRAL Delay timer is initiated.
• Once the NEUTRAL DELAY timer expires the Gen Ready to Load
output energizes to signal the transfer switch to transfer to the
generator supply. Note: The neutral delay function is only operative
with an electrically-held type transfer switch mechanism (ie. electrical
contactor type).
8.3.5.3.UTILITY POWER RETURN:
• Remote Start input signal is removed and the Return Delay timer is
initiated (i.e. Utility Voltage returns to normal and the Utility voltage
sensor contact opens).
• Once the Return Delay timer expires, the Generator Ready to Load
output de-energizes and the Neutral Delay timer is initiated.
• Once the Neutral Delay timer expires the Utility Ready to Load output
energizes to signal the transfer switch to transfer to the utility supply.
Note: If the generator has a shutdown during the Return or Neutral
Delay periods, the timers are bypassed, and the Utility Ready to Load
output immediately energizes.
• The generator Cooldown Timer starts timing following expiry of the
Return Delay timer.
• The generator stops following expiry of the Cooldown Timer.
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