System Operation
Copyright © 2008-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-63C August 2011
15
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
In DCTools go to: Control Processes > 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
Description
Where to find:
State
Indicates if AVC is active or inactive.
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 is activated by a signal from an ac standby generator.
► To enable BCL
Use the SC100 keypad to go to:
Menu > Configuration > Battery Current Limit > Edit
Or, in DCTools go to:
Control Processes >
Battery Current Limit
.
► To activate Engine Run BCL
Connect a voltage free relay contact (that will operate when the standby generator starts) to
a Digital Input.
In DCTools go to
Digital Inputs
.
Configure the selected Digital Input and set
Function
to
Engine Run
.
In DCTools go to
Control Processes >
Battery Current
Limit
and set the
Engine Run Limit
.
Содержание SC100
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