Alm12V7S Hp Troubleshooting And Solutions - NEC ALM 12V7 s-Series User Manual

®
ALM 12V7 s-Series User's Guide
Problem
The battery does not deliver the
expected Ah (capacity).
Charge current suddenly goes to zero
while connected to a source.
Voltage drops abruptly while in use
after appearing constant.
Low or zero volts across the terminal
a.
High-speed OCP occurs in10 μs so it will not be visible on a digital volt meter.
406014-02EN, Rev. 05
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Table 17 ALM12V7s HP Troubleshooting and Solutions
Possible Cause(s)
1. The battery is out‐of‐balance.

2. The battery has reached the end of
its useful service life.
3. The battery overheated due to
ambient temperature or C-Rate.
1. The battery overheated, enabling
over‐temperature protection.
2. The battery is out‐of‐balance.



3. Charge current is too high,
exceeding OCP protection.
1. The battery is fully discharged.
2. OCP has engaged
1. The battery is in UVP or UVLO.
2. The battery is in OTP.
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Chapter 6: Troubleshooting
Solution(s)
1. Apply a float charge for 48 hours to balance
the battery cells.
2. Replace the battery.

3. Reduce the ambient temperature or C-Rate.
1. Allow the battery to cool.
2. Apply a float charge for 48 hours to balance
the battery's cells. For more details on
charging battery, batteries, or strings, refer to
Charging Single Batteries
Charging Multiple Batteries
3. Reduce charge current.
a
1. Perform a charge cycle.
2. Reduce the load.
1. Perform a charge cycle.
2. Allow the battery to cool.
on page 33 and
on page 36.
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