Eaton SC200 - Page 66

SC200 Handbook
58
Copyright © 2007-2011 Eaton Corporation. All Rights Reserved.
IPN 997-00012-50H November 2011
Information
The following information is available about Battery Mid-point Monitoring.
Parameter
Description
Where to find:
MPM State
Disabled: MPM is Disabled.
Unable To Start: MPM is Enabled but either: Cells
per String is zero; the bus voltage sensor has
failed; ac supply has failed; the battery is in
discharge state; Fast Charge, Equalize or Battery
Test is active; or the battery fuse has failed.
Locked Out: MPM is within the MPM Lockout
Period. No String Fail alarm will become active in
this period.
Converging: MPM is outside the MPM Lockout
Period but is within MPM Convergence Period.
Stable: MPM is outside the MPM Convergence
Period.
SC200: Battery > MPM
DCTools/Web: Batteries >
Mid-point Monitoring
Time In This State
The time period MPM has been in the current
state.
Current MPM
Threshold
When MPM state is Converging this value is
between MPM Start Threshold and MPM Stable
Threshold. When MPM state is Stable this value is
the MPM Stable Threshold.
Reference Voltage
The calculated mid-point reference voltage (50%
of the bus voltage for even number of cells).
String State
OK: MPM is in the state Converging or Stable and
the string's Imbalance is below the current
threshold.
Unavailable: The MPM is not in state Converging
or Stable, or the string's mid-point voltage is
unavailable.
Pending Fail: The string's Imbalance is above the
current threshold, but has not yet been so
continuously for the String Fail Recognition
Period.
Fail: The string's Imbalance has been above the
Current MPM Threshold for longer than the String
Fail Recognition Period. This will activate a String
Fail alarm.
Not Configured: No analog input is mapped to
this string.
Mid-point Voltage
Shows the mid-point voltage reading for the
string or N/A if no analog input channel is
mapped to this string.
Imbalance
The percentage imbalance of the Mid-point
Voltage.