Eaton SC300 - Generator Control

SC300 Handbook
78
Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.
IPN 997-00012-03 B2 Issue B2 July 2018
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 Start Generator settings.
The options are:
• Start generator on fast charge - The controller will activate the generator control relay while Fast
Charge is active or pending, and deactivate it when the Fast Charge cycle ends.
• Start generator on equalize - The controller will activate the generator control relay while Equalize
is active, and deactivate it when the Equalize cycle ends.
• Start generator on AC Peak Load Reduction - The controller will activate the generator control
relay when PLR is active, and the battery has discharged down to the PLR Low Voltage Limit
and deactivate it when the battery is fully charged (as indicated by Ah Discharged is zero).
• Start generator on mains failure – The controller will activate the generator control relay when an
ac supply failure is detected, and deactivate it when the ac supply is restored.
A Generator Fail alarm is activated if the SC300 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.
The SC300 detects that the generator is running from a digital input. There must be a digital input
connected that is active when the generator is running. This should be configured with Function =
Engine Run.
► To manually start the generator
• Make sure that Maximum Run Time has been set to a value greater than zero.
• Use the SC300 keypad to go to: Control Processes > Generator Control > Settings (tab) and
select Start Manual Run.
• On DCTools/web, go to Control Processes > Generator Control > Manual Run and click Start.
► To manually stop the generator after a manual start
• Use the SC300 keypad to go to: Control Processes > Generator Control > Settings (tab) and
select Cancel Manual Run.
• On DCTools/web, go to Control Processes > Generator Control > Manual Run 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 SC300 keypad to go to: Control Processes > Generator Control.
• On DCTools/web, go to Control Processes > Generator Control.