Lucent Technologies ECS Minicell Battery Plant H569-420
7 - 2 Maintenance
Issue 5 February 1997
DC Circuit
Breakers
Circuit breakers CB1 through CB42 are located in the DC
distribution.
Any circuit breaker in the battery plant is ON (or closed) when
the handle is in the Up position, and OFF (or open) in the Down
position. A circuit breaker which is supplying a load may be
turned off manually, but this may affect service to the load. If a
breaker has tripped off (the handle will be between the ON and
OFF positions), the overcurrent problem should be cleared
before restoring power to the load and resetting the breaker. See
“Troubleshooting” below for information on tripped breakers.
Troubleshooting
Table 7-A provides a list of observable trouble conditions, their
possible causes and the recommended corrective action for each
cause. The table is organized by the subsystem in which the
trouble is observed.
Table 7-A: Troubleshooting
Condition
Probable Cause
Corrective Action
Controller
Red or yellow LED is lit
No LEDs or display lit
Meter inaccuracy
Office alarms issued
False alarms issued
Blown fuse on
LVD/Fuse board
See "Troubleshooting" in Controller Manual.
Rectifier
Red or yellow LEDs lit
No LEDs or display lit
No output/low output
Oscillation
Open output breaker
See "Troubleshooting" in Rectifier Manual.
DC Distribution Subsystem
Open distribution
breaker
1. manually turned off
2. overcurrent trip
3. breaker failed
See "Open Distribution
Breaker" section that
follows.
LVD OPEN Led lit
1. failed LVD contactor
2. low voltage
3. faulty wiring
4. LVD circuit failure
See "Red LVD OPEN
LED Lit" section that
follows.
LVD FAIL LED lit
1. low voltage
2. LVD circuit failure
See "Yellow LVD FAIL
LED Lit" section that
follows.
