User Manual

Pre–Power–up Tests – continued
PRELIMINARY 2
SC 4812ET BTS Optimization/ATP – CDMA LMF
July 1999
2-16
Table 2-18: DC Power Pre–test (RF Cabinet and Power Cabinet)
Step Action
7 Set the 8 LPA breakers ON by pushing them IN one at a time. Repeat step 3 after turning on each
breaker.
 A typical response is that the ohmmeter will steadily climb in resistance as capacitors charge,
stopping at approximately 500
Ω..
8 Plug all LPAs and EBA fan module into associated plugs in the chassis one at a time. Repeat step 3
after connecting each LPA and EBA fan module.
 A typical response is that the ohmmeter will steadily climb in resistance as capacitors charge,
stopping at approximately 500
Ω..
 Disconnect Ohm meter after all tests are successfully completed.
9 Seat the heat exchanger, ETIB, and Options breaker one at a time. Repeat Step 3.
Figure 2-2: DC Distribution Pre-test
4 1
5 2
6 3
SC 4812ET BTS RF Cabinet
LPA1C
LPA1A
LPA1B
LPA1D
LPA2C
LPA2A
LPA2B
LPA2D
LPA3C
LPA3A
LPA3B
LPA3D
LPA4C
LPA4A
LPA4B
LPA4D
CIRCUIT BREAKER PANEL
HEAT EXCHANGER
OPTIONS
MAIN BREAKER
400
50
1B
L
30
30
30
30
30
30
30
30
50
50
1D
2B
2D
3B
3D
4B
4D
1A
1C
2A
2C
3A
3C
4A
4C
P
A
C
C
C
P
1
2
3
10
15
15
LPA
BLOWER
ETIB
10
2