SC300 Handbook
28
Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.
IPN 997-00012-03 B2 Issue B2 July 2018
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.
AVC controls both AC rectifiers and solar chargers, so that the same bus voltage is maintained,
irrespective of the energy source.
► To enable Active Voltage Control
•
Use the SC300 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 it if there are particular reasons.
Information
The following information is available about AVC.
Parameter
Description
Where to find:
State
Indicates if AVC is active or inactive.
Web/DCTools:
Control Processes > Active
Voltage Control
Target Voltage
AVC will set the Base Voltage to attempt to
maintain the bus voltage to this value.
Voltage Offset
The difference between the Base Voltage and the
Target Voltage.
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):
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.
Engine Run Limit applies when the SC300 determines that an ac standby generator is running. If
an Engine Run Digital Input is available (see below), then the SC300 uses this to determine if the
generator is running. If an Engine Run Digital Input is not available then the SC300 uses other
values to determine if the generator is running.
► To enable BCL
•
Use the SC300 keypad to go to:
Control Processes > Battery Current Limit.
•
Or, in DCTools/Web go to:
Control Processes >
Battery Current Limit
.
