System Operation
Copyright © 2008-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-63C August 2011
37
Batteries Configuration
The following battery parameters must be configured.
Parameter
Description
Where to find:
Cells Per String
The number of 2V cells per battery string (for example:
24 in a 48V nominal system).
DCTools: Batteries
Battery Capacity
Set to the rated 10 hour capacity of the installed battery
strings.
Battery State
Threshold
Used to determine the
Battery Charge State
. See
Battery
Charge State
on page
DCTools: Alarms > Alarm
Configuration
Battery Time Remaining
The SC100 obtains characterization data from periodic battery discharges, to a specified end
voltage.
During a battery discharge, the SC100 uses this characterization data to calculate an estimated
time until the battery will reach the specified end voltage.
If a battery disconnect LVD is fitted then the end voltage will usually be the voltage at which the
LVD disconnects the battery.
Battery Time Remaining is designed for a constant power load. The accuracy of the time
remaining calculation will be reduced if the dc power system is connected to a predominantly
resistive (constant current) load.
The time remaining calculation will not be correct if a non-essential load is disconnected during
the battery discharge.
The following information is available about
Battery Time Remaining
.
Parameter
Description
Where to find:
Battery Time
Remaining*
During a battery discharge, this is the estimated time
until the battery voltage will be equal to the
End
Voltage,
at the present battery current.
Time Remaining
will be re-calculated if the load current varies during
discharge (for example, when a load disconnect LVD
operates).
SC100: Menu > Controls >
Batt Time Remaining
DCTools: Batteries
Estimated State of
Charge (SOC)*
The estimated charge left in the battery (Ah).
*Values of Battery Time Remaining and SOC are only available during a discharge and if the
battery has been characterized
. The values will be N/A when the Battery Charge State is
Floating or Charge, or
if the battery has not been characterized.
See Battery Characterization
on page
Battery Characterization
Battery Characterization
is a controlled battery discharge that provides data for the SC100 to
estimate the
Battery Time Remaining
during any subsequent battery discharge. The data is
displayed in the
Battery Characterization Table
.
Summary of Contents for SC100
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