Nortel DMS-100 Series Maintenance Manual page 76

1-60 OPM maintenance summary
4. For OPMs equipped with Yuasa and Eagle-Picher batteries, the voltage
5. Measure the voltage of the complete battery string. The open-circuit or
6. If a string continues to fail the audit test while other strings pass, the string
297-8361-550 Standard 04.02 December 2004
must be 52.0V dc , ± 0.3V. Low rectifier voltage can cause a battery string
to fail the other tests.
If rectifier voltage is within specification, measure the voltage of each
battery in the failed battery string. Replace the string if the voltage of a
battery is more than 1V less than the voltage of the other batteries.
If the rectifier voltage is not within specification, adjust the rectifier
voltage screws. Continue until the voltage is within specification and the
current from each rectifier is balanced.
post-charge test can fail. If these failures occur. replace the complete
string. Replace the string if the battery string voltage is less than
OPM_VOLT_TST_OCC, -50.4V dc for Yuasa and Eagle-Picher batteries.
The discharge test can fail. If this failure occurs, replace the complete
string if the battery string voltage is less than OPM_VOLT_TST_DIS,
-49.5V dc for Yuasa and Eagle-Picher batteries.
is weak. Replace the complete string.
If all strings appear operational, return the battery strings to service. Enter
the BSY BCCDVR and RTS BCCDVR commands from the PES level of
the MAP display.