User's Manual

Table Of Contents
Power Removal
FEB 2005 1X SC 4812T Lite BTS Optimization/ATP 2-15
PRELIMINARY
Introduction
DC and AC Power removal from an SC4812T Lite BTS is accomplished
by performing the procedure in Table 2-6.
Some maintenance, upgrade, or other activities may only require
removing DC Power. In those situations where all power must be
removed from a frame, removing AC Power will also be required.
Remove Power
If it becomes necessary to remove power from the frame, refer to
Figure 2-4 and perform the procedure in Table 2-6.
Table 2-6: Power Removal Procedure
n Step Action
1 Set all PDA Circuit Breakers to the OFF (pulled out) position in the following sequence:
1a Pull out the four LPA Circuit Breakers labeled 1A–1D through 2A–2D.
1b Pull out the two Power Distribution Assembly (PDA) Circuit Breakers labeled SCCP–1 and
SCCP–2.
2 Confirm that all LEDs are OFF except for the Power Supply Module LEDs, if present.
3 Remove all DC Power Sources (+27V, –48V, or Battery Back–up) to the BTS Frame by
disengaging the appropriate Customer Circuit Breakers.
4 Remove the AC Power, then lock and tag the AC Power Box (AC Frame only).
5 Verify that all PSM LEDs are OFF.
n WARNING
The Surge Capacitors in the DC PDA stores large electrical charges for long periods of time.
Failure to discharge these capacitors as specified in Step 6 could result in serious personal injury
and/or damage to the equipment.
6 On the DC PDA, set the SCCP1 and SCCP2 Circuit Breakers to the ON (pushed in) position, and
wait at least 30 seconds.
7 Set the PDA SCCP1 and SCCP2 Circuit Breakers to the OFF position.
2