Eaton SC200, Руководство по эксплуатации

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System Operation
Copyright © 2007-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-50H November 2011
59
Configuration
Set the following parameters.
Parameter Description Where to find:
String Fail alarm
parameters See System Alarm Configuration on page 46 . DCTools/Web: Alarms >
Alarm States
MPM Enable Enable/disable Mid-point Monitoring.
SC200: Battery > MPM >
Settings
DCTools/Web: Batteries >
Mid-point Monitoring
MPM Lockout
Period* Time from when MPM is able to start until the
start of the
MPM Convergence Period .
MPM Convergence
Period* Time from the end of the MPM Lockout Period
until MPM State is Stable . During this period the
Current MPM Threshold is calculated using linear
interpolation between Start Threshold and Stable
Threshold and the MPM State is defined as
Converging . After this period the MPM State is
defined as Stable and the MPM Stable Threshold
applies.
String Fail
Recognition Period If the mid-point Imbalance percent of a battery
string exceeds the MPM Threshold for this period
of time the String State is set to Fail and the String
Fail alarm is activated.
MPM Start
Threshold* Mid-point Imbalance percent threshold at the
start of the MPM Convergence Period .
MPM Stable
Threshold* Mid-point Imbalance percent threshold after the
convergence period.
* A dynamic alarm threshold is used to give the best possible battery fault detection:
1
After the end of a discharge, Fast Charge or Equalize cycle, MPM does not start until the
end of the
MPM Lockout Period , to ensure the system is in float charge.
2
At this point, the battery cell voltages are expected to be widely spread, so the alarm
threshold is set high (
MPM Start Threshold ).
3
The alarm threshold is then progressively reduced over the MPM Convergence Period .
4
After the end of the MPM Convergence Period , cell imbalance is assumed to be stable, and a
fixed threshold is used ( MPM Stable Threshold ).
Battery Time Remaining
The SC200 obtains characterization data from every full battery discharge, to a specified end
voltage.
During a battery discharge, the SC200 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.