User's Manual

Power Removal68P09255A69-3
Aug 2002
1X SC4812ET Lite BTS Optimization/ATP Software Release 2.16.1.x
PRELIMINARY
2-19
Power Removal
Power Removal Procedures
Power removal from an SC4812ET Lite BTS frame is accomplished in
the following two-stage sequence:
1. DC power removal
2. AC power removal
Some maintenance, upgrade, or other activities may only require
removing DC power. In those situations where all power must be
removed from a frame, shutting down AC power will also be required.
Remove DC Power
If it becomes necessary to remove DC power from the frame, refer to
Figure 2-6 and follow the procedure in Table 2-9.
Table 2-9: DC Power Removal
Step Action
1 Set all DC PDA circuit breakers to OFF (pulled out) in the following sequence:
1. LPA (four circuit breakers, labeled 1A-1B through 3C-3D )
2. PILOT BEACON
3. HEAT EXCHANGER (two circuit breakers)
4. ETIB
5. OPTIONS
6. PS1 and PS2
7. MAIN BREAKER
2
n WARNING
The surge capacitors in the DC PDA will store a large electrical charge for long periods of time.
Failure to discharge these capacitors as specified in this step could result in serious personal injury or
damage to equipment.
On the DC PDA, set the PS1 and PS2 circuit breakers to ON (pushed in), and wait at least 30
seconds.
3 Set the DC PDA PS1 and PS2 circuit breakers to OFF.
4 Set the MAP power switch to OFF.
2