System Operation
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IPN 997-00012-03 B2 Issue B2 July 2018
71
2 Click on Clear String Fail.
Information
The following information is available about MPM / QPM:
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.
SC300: 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.
¼ Point Voltage Shows the first quarter-point voltage reading for
the string or N/A if no analog input channel is
mapped to this string.
Only shown if an analog input is configured as
Battery First Quarter Point.
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.
¾ point Voltage Shows the third quarter-point voltage reading
for the string or N/A
if no analog input channel is
mapped to this string.
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