Active Voltage Control (Avc); Battery Current Limit (Bcl) - Eaton SC200 Operation Handbook

Active Voltage Control (AVC)

Active Voltage Control maintains a constant float voltage under varying load current by
monitoring the bus voltage and adjusting the rectifier output voltage to compensate for any
voltage drop. This prevents undercharging the batteries during high load demand.
► To enable Active Voltage Control
Use the SC200 keypad to go to: Control Processes > Voltage Control > AVC.
Or, in DCTools/Web go to: Control Processes > Voltage Control > Active Voltage Control.

Active Voltage Control is normally enabled. Only disable if there are particular reasons.
Information
The following information is available about AVC.
Parameter
State
Target Voltage
Voltage Offset

Battery Current Limit (BCL)

Battery Current Limit automatically limits the battery recharge current to:
Prevent excessive battery charge current in under-loaded systems
Minimize gas release in VRLA batteries
Reduce the load on a standby generator.
Two current limit values can be set (both are a percentage of the C10 rating of the battery):
Battery Current Limit (Normal Limit): BCL value for use when utility ac is available.
Engine Run Limit (optional):

Engine Run Limit applies when the SC200 determines that an ac standby generator is running. If
an Engine Run Digital Input is available (see below), then the SC200 uses this to determine if the
generator is running. If an Engine Run Digital Input is not available then the SC200 uses other
values to determine if the generator is running.
► To enable BCL
Use the SC200 keypad to go to: Control Processes > Battery Current Limit.
Or, in DCTools/Web go to: Control Processes > Battery Current Limit.
Description
Indicates if AVC is active or inactive.
AVC will set the Base Voltage to attempt to
maintain the bus voltage to this value.
The difference between the Base Voltage and the
Target Voltage.
Copyright © 2007-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-50H
Where to find:
DCTools/Web:
Control Processes > Active
Voltage Control
BCL value for use when ac is supplied by a standby
generator. This reduces the load on the generator
and allows a smaller generator to be used.
November 2011
System Operation
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