System Operation
Copyright © 2007-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-50H November 2011
Generator Control
Generator Control is used to delay the start of a standby ac generator until the batteries are
partially discharged (rather than immediately after the ac supply fails). This can save fuel by
preventing the generator running during short ac supply failures. It can also be used to control
a generator in a hybrid power system (cyclic charge/discharge).
Generator Control uses a digital output (relay) which is connected in series with the generator
run signal of the generator controller. The relay contacts interrupt the generator run signal until
the Generator Control is active.
The Generator Control output is activated and deactivated depending on the setting of Automatic
Control Mode. The options are:
Disabled – The controller will not activate the generator control relay based on control
functions. However, alarms mapped to the same relay will activate and deactivate the
relay.
Fast Charge Only – The controller will activate the generator control relay while Fast Charge
is active or pending, and deactivate it when the Fast Charge cycle ends.
Fast Charge or Equalize – The controller will activate the generator control relay while either
Fast Charge or Equalize is active or pending, and deactivate it when the Fast Charge or
Equalize cycle ends.
Every Mains Failure – The controller will activate the generator control relay as soon as an ac
supply failure is detected, and deactivate it when the ac supply is restored.
A Generator Fail alarm is activated if the SC200 does not detect that the ac supply is present
(rectifiers have turned on) after the Generator Fail Alarm Recognition Period following Generator
Control becoming active.
The generator can also be started and stopped manually.
► To manually start the generator
Make sure that Maximum Run Time has been set to a value greater than zero.
Use the SC200 keypad to go to: Control Processes > Generator Control > Settings (tab) and
select Start Manual Run.
In DCTools/Web go to Control Processes > Generator Control and click Start.
► To manually stop the generator after a manual start
Use the SC200 keypad to go to: Control Processes > Generator Control > Settings (tab) and
select Cancel Manual Run.
In DCTools/Web go to Control Processes > Generator Control and click Cancel.
This will not stop the generator if it is running due to a Fast Charge, Equalize, or AC failure.
When the generator has been started manually, Generator Run Time Remaining shows the time
remaining for the generator to run.
► To view Generator Run Time Remaining
Use the SC200 keypad to go to: Control Processes > Generator Control.
In DCTools/Web go to Control Processes > Generator Control.
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