Manual Test Procedures For System-Failed Battery Strings - Nortel DMS-100 Series Maintenance Manual

2-64 OPAC maintenance overview

Manual test procedures for system-failed battery strings

The system can mark a battery string pair as failed. When this event occurs
the PES117 log records the voltages of the strings and the test that fails. The
office parameters set the values used for testing.
The voltage identifiers in the PES117 log correspond to the office
parameters as follows:
The manual test procedures that determine if the batteries need replacement
depend on the test that fails. The procedures consist of activities that occur
at the MAP terminal and at the OPAC site.
Procedure that follows failure of open circuit test at the MAP
terminal
The procedures that follow contain instructions on the actions to take for
specified failed tests.
1 Disable the AUDIT from the PES MAP level.
2 Use the PES117 log to determine the voltage of the battery string tested
3 Place the failed battery string pair on the charge bus for 6 h.
4 Open circuit the failed battery string pair for at least 6 h.
5 Use the PES MAP level MEASURE command to measure the voltage of
6 If the voltage is less negative than OPM_VOLT_TST_CHG, leave the
297-8211-550 Standard 05.01 August 1999
OPEN-CIRCUIT indicates the value failed the test against
OPM_VOLT_TST_OCC (–504 or –50.4 V dc)
DISCHARGE TEST indicates the value failed the test against
OPM_VOLT_TST_DIS (–495 or –49.5 V dc)
POST CHARGE indicates the value failed the test against
OPM_VOLT_TST_CHG (–509 or –50.9 V dc)
below OPM_VOLT_TST_OCC. If the system marked strings 1 and 5
failed, determine if string 1, 5, or both strings caused the alarm.
For OPACs, the default for OPM_VOLT_TST_OCC is –504 or
–50.4 V dc.
the failed battery string pair.
battery string pair on open circuit and proceed with OPM site tests.
For OPACs with an MTU, the default for OPM_VOLT_TST_CHG =
–509 or –50.9 V dc.
For OPACs with an LTU, OPM_VOLT_TST_LTU_ ADJUSTMENT
(default is 10) offsets and truncates the default for
OPM_VOL_TST_CHG. –509 + 10 = –499 Trunc (–499)=–490 or –49
V dc.