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
57
Battery Mid-point Monitoring (MPM)
Battery Mid-point Monitoring provides a cost-effective method for the early detection of
internal battery faults. The voltages of the two halves of a battery string are measured and the
system controller generates an alarm signal if a voltage imbalance is detected.
A voltage imbalance is an indication that one or more cells has an internal fault. Further
investigation can then isolate the faulty cell(s) and action can be taken to correct the problem
and prevent a total battery failure.
To connect Battery Mid-point Monitoring see details in the dc power system Installation and
Operation Guide. If a
String Fail alarm is generated see Troubleshooting on page 100 .
To ensure reliable operation Mid-point Monitoring operates only when the battery is in float
charge and after a configurable lockout period since the last battery discharge, Fast Charge,
Equalize or Battery Test.
► To enable
Battery Mid-point Monitoring (MPM)

If any of the mid-point monitoring analog inputs are used for Reverse Battery Detection (see
details on page
64 ) then they are not available for MPM.
1
Connect the mid-point monitoring sense wires to the batteries. Refer to the dc power
system Installation and Operation Guide.

There are four mid-point monitoring analog inputs on an IOBGP input/output board (for four
battery strings). Up to 20 additional battery strings can be monitored if additional IOBGP
input/output boards are connected. Refer to the dc power system Installation and Operation
Guide for details on how to connect additional IOBGP input/output boards to the SC200.
2
In DCTools/Web go to Batteries .
3
Set Cells Per String to the number of 2V cells per string (for example: 24 for 48V nominal
system).
4
Expand the Mid-point Monitoring table.
5
Set MPM Enable to Enabled and check the configuration settings (see details on page 59 ).
6
Go to Analog Inputs and Enable the mid-point monitoring analog inputs (one per battery
string) as required.

Battery strings 1-4 will be connected to IOB Number 1, IOB AI Numbers 2-5. Battery strings
5-8 will be connected to IOB Number 2, IOB AI Numbers 2-5. And so on, as required up to
string 24.
7
Go to Alarms > Alarm States . Enable and configure the String Fail alarm. See System Alarm
Configuration on page 46 .
► To clear a
String Fail alarm
1
In DCTools/Web go to Batteries > Mid-point Battery Monitoring (expand the table).
2
Click on Clear String Fail .