User's Manual

Initial Power Up – continued
08/01/2001
2-7
1X SCt4812ET Lite BTS Optimization/ATP
PRELIMINARY
Figure 2-6: DC PDA
SC4812ETL0009–3
LPA
1B 1D 3B 3D
1A 1C 3A 3C PS1 PS2
ETIB
OPTIONS
25 25
HEAT EXCHANGER
CAUTION
SHUT OFF BOTH BREAKERS
ONLY DURING HEAT EXCHANGER
MAINTENANCE OR REPAIR
LPA
BLOWERS
PUSH BUTTON
TO RESET
LPA BLOWERS
MAIN BREAKER
300
50 5010 1530 30 30 30 15
PILOT
BEACON
DC Power System Pre-Power
Application Test
Before applying any power to the BTS frame, follow the procedure in
Table 2-3 to verify there are no shorts in the DC power distribution
system.
The procedure in Table 2-3 is required only on initial BTS
power–up or following maintenance when any major
power components (e.g., ACLC, DC PDA, Meter Alarm
Panel) were replaced or internal DC power cables were
disconnected.
NOTE
Table 2-3: DC Power System Pre–Power Application Test
Step Action
1 Physically verify all ACLC front–panel circuit breakers (Figure 2-4) are OFF (down), all DC PDA
circuit breakers (Figure 2-6) are set to OFF (pulled out), and all battery shelf circuit breakers
(Figure 2-3) are OFF (pulled out).
2 Visually ensure that all AC rectifier modules (Figure 2-3) are not powered (DC, PWR, and bar graph
LEDs are not lighted), that the MAP power switch (Figure 2-9) is OFF, and that no LEDs on the
MAP are lighted.
3 Inside the battery compartment, measure the voltage between the + (red) and – (black) battery bus
bars. There should be no 27 Vdc present.
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