User Manual

Power Cabinet Initial Power Up – continued
July 1999
2-7
SC 4812ET BTS Optimization/ATP – CDMA LMF
PRELIMINARY 2
Table 2-5: RF Cabinet Power Up
Step Action
4 Measure the voltage drop between the Power Cabinet meter test point and the 27 V buss bar inside
the RF Cabinet PDA while the RF Cabinet is transmitting.
NOTE
For a three (3) sector carrier system, the voltage drop should be less than 0.2 VDC.
For a twelve (12) sector carrier system, the voltage drop should be less than 0.3 VDC.
5 Using a DC current probe, measure the current in each of the six (6) DC cables that are connected
between the RF and Power Cabinet. The DC current measured should be approximately the same.
If there is a wide variation between one cable and the others (>10 A), check the tightness of the
connections (torque settings) at each end of the cable.
Battery Discharge Test
The test procedures in Table 2-6 should only be performed when the
battery current is less than 5 A per string. Refer to Table 2-4 on the
procedures for checking current levels.
Table 2-6: Battery Discharge Test
Step Action
1 Turn the battery test switch on the DMAC ON. The rectifier output voltage and current should
decrease as the batteries assume the load. Alarms for the DMAC may occur.
2 Measure the individual battery string current using the DC current probe. The battery discharge
current in each string should be approximately the same (within +
5 A).
3 Turn Battery Test Switch OFF.
Heat Exchanger Test
Table 2-7: Heat Exchanger Test
Step Action
1 Turn the Power Cabinet Heat Exchanger breakers ON.
2 The Heat Exchanger will now go into a 5 minute test sequence. Ensure that the internal and
external fans are operating. Place a hand on the internal and external Heat Exchanger grills to feel
for air draft.
2