EC500 Controller Handbook
Copyright © 2019 Eaton Corporation. All Rights Reserved.
Issue A March 2019
Page 71 of 107
Monitoring
The following information is available about Battery Mid-point Monitoring.
Parameter
Description
Where to find:
Upper Half String
Lower Half String
String Status
This shows the voltage of Battery string from mid-
point of the string to top of the string. For example,
if 24 cells consider for 48V Battery bank, then it
shows the voltage between 13
th
cells to 24
th
cell.
This shows the voltage of Battery string from ground
point of the string to mid-point of the string. It
shows the voltage between 1
st
cells to 12
th
cell.
Calculate the difference between Upper Half String
voltage and Lower Half String voltage, if this
difference is less than MPM Threshold Voltage then
status shows OK.
LCD: Menu>System
Status>String
Monitoring>Mid String
Voltage.
Web: Menu>System
Status>String Monitoring
Battery String x
Alarm
When string status is not OK, EC500 generates an
alarm if “Battery String x Fail” is enabled, x defines
the number of battery string. For example, Battery
String number 2 generates an alarm then display will
show “Battery String 2 Fail”.
Web:
Menu>Settings>Alarm
Management
Configuration
The following parameters are available for configuring Battery Mid-point Monitoring.
Parameter
Description
Where to find:
Monitoring
Max Strings for
MPM
If set for disabled, then Battery Mid-point
monitoring will not active and respective parameters
are not visible to user. So, to activate and configure
the Battery Mid-point monitoring first select it for
Mid-point monitoring (MPM) or Quarter point
monitoring (QPM).
Select the number of Battery strings available in
system. As per the selection of Strings for MPM,
string parameters are visible in system status
LCD: Menu>System
Config>DC Config>String
Monitoring
Web: Menu>System
Config>DC Config>String
monitoring
MPM Volt
Threshold
This setting is used to calculate the final status of
Battery string. Each string compares its difference of
Upper half voltage and Lower half voltage with this
threshold. If difference is beyond this limit then
status is not OK. Same value is applicable to all
available Battery strings.
Mid-point monitoring operates only when Battery is
in float mode. Every time when Battery rests in Float
LCD:
Menu>Settings>Battery
Settings>General
Settings>String Monitoring