Nortel DMS-100 Series Maintenance Manual page 685

Site test in an OPM
At the MAP display
1 To access the OPMPES MAP level, type
>MAPCI;MTC;PM;PES
and press the Enter key.
2 To post the appropriate alarm, type
>POST alarm_state
and press the Enter key.
where
alarm_state
is RED or AMBER
3 To disable the automatic battery rotation and tests, type
>AUDIT DISABLE
and press the Enter key.
At the OPM cabinet
4 Use a voltmeter with at least 0.2% accuracy to measure the voltage of both
rectifiers. Use the test jacks on the rear of the rectifiers.
For OPMs with Yuasa batteries, the voltage must be 52.0Vdc, ± 0.3V. Low
rectifier voltage can cause a battery string to fail other tests.
If the voltage
is in specification
is not in specification
5 Adjust the rectifier voltage screws (VA) until the voltage is in specification and
the current from each rectifier balances.
6 Measure the voltage of each battery in the failed battery string. The voltage
of any battery can be more than 1V less than the voltage of the other batteries
in the string. If this condition occurs, replace the entire string.
If voltage for
any battery is greater than 1V
less than any other
all batteries in strings are in 1V
difference
OPM routine maintenance procedures
DMS-100 Family OPM Maintenance Manual XPM14 and up
OPM
Do
step 6
step 5
Do
step 9
step 7
13-83
Site test
(continued)