System Operation
Copyright © 2007-2018 Eaton Corporation. All Rights Reserved.
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.
