User's Manual
Alarms Testing – continued
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
3-90
Multiple Rectifier Failure
(Four Rectifier System)
Table 3-55 gives instructions on testing multiple rectifier failure or major
alarm in a four (4) rectifier system (two–carrier system).
Table 3-55: Multiple Rectifier Failure or Major Alarm, Two–Carrier System
Step Action
1
! CAUTION
Only perform this test if the rectifier current load displayed on the AMP indicator on the MAP is
125 amps or less. Sufficient current capability to support a greater load may not be available when
two rectifiers are removed from the bus.
On the ACLC, set the RECT. 2/4 circuit breaker to OFF.
S The DC and PWR LEDs should light red on the rectifiers in shelf positions 2 and 4.
S The MAJOR ALARM (red), MINOR ALARM (amber), and RECTIFIER FAIL (red) LEDs on the
MAP should light.
S The CDMA LMF should report an alarm condition as BTS Relay #21, BTS Relay #24, and BTS
Relay #29 contacts, respectively.
2 Set the RECT. 2/4 circuit breaker on the ACLC to ON.
S All alarm indications should clear on the rectifiers, MAP, and CDMA LMF.
Battery Over Temperature
Alarm (Optional)
Use special care to avoid damaging insulation on cables, or
damaging battery cases when using a heat gun.
CAUTION
Table 3-56 gives instructions on testing the battery over–temperature
alarm system.
Table 3-56: Battery Over–Temperature Alarm
Step Action
1
Use a low–powered heat gun to gently heat the battery over–temperature sensor (see location in
Figure 3-21).
! CAUTION
To avoid damaging the cable insulation, do not hold the hot air gun closer than three (3) inches from
the sensor.
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