Nortel DMS-100 Series Maintenance Manual page 668

13-20 Routine maintenance procedures
Battery replacement
OPAC
(continued)
At the OPAC site
5
6
297-8211-550 Standard 05.01 August 1999
WARNING
Possible system damage
When you add or remove battery strings from an
active OPAC, make sure the battery strings are in the
open circuit state. Check the state of the battery
strings at the MAP terminal.
Turn off the associated battery charger controller card
BCC NT8X02.
Connect or disconnect the battery cables at the back of
the cabinet.
After you connect the affected battery strings, return
the battery strings to the load bus one string at a time.
If there is no MAP terminal control, turn off the BCC
before you connect or disconnect any battery strings.
CAUTION
Possible loss of service during battery replacement
Do not turn off more than one BCC NT8X02 at a
time. If you turn off more than one BCC NT8X02,
service is lost if ac power is interrupted. Turn off
BCC0 when you work on battery strings 0, 1, or 2.
Turn off BCC1 when you work on battery string 4, 5,
or 6.
DANGER
Hazardous chemicals
Battery chemicals can be hazardous and explosive.
Use caution.
Turn the correct BCC NT8X02 power switch to the OFF position.
Disconnect and remove matched battery string.