User's Manual

MCPA TBS SYSTEM USER MANUAL

3.2 SYSTEM DC POWER ON AND OFF PROCEDURES

The following procedures are for TBS system DC power on and off.

1. Test the antenna system and ensure the echo loss within working frequency is less than

-14dB (VSWR<1.5).

DANGER

z Do not turn on the power supply from Rectifier.

z Do not turn on input power from BTS.

2. Visually inspect the power connection within the equipment. Ensure that the power cable is

correctly and securely connected.

3. Check grounding connection and verify that the ground resistance is less than 5Ω.

4. Check all circuit breaker of MCPA modules have been set to OFF. And Enable Switch has

been set to DISABLE position.

5. Before turn on MCPA Module, use power meter to test the input composite power from BTS

is not more than 43dBm.

WARNING

z Do not input >43dBm power into MCPA.

z Before applying power from BTS, please make sure the MCPA has been

properly terminated at 50 ohms.

6. Turn on the power from Rectifier and verify the input voltage for MCPA is in the range of

26-28Vdc on the power terminals at the back of Backplane. After power on, the cooling fans

will run and LED indicators on System Controller front panel will become stable without red or

amber color.

7. Turn on power of MCPA one by one (set Circuit Breaker to ON and push Enable Switch to

ENABLE). Check the LED indicators and there’s not red or amber color.

Note:

After this step, all LED indicator status on the front panel of System Controller and

MCPA modules are in normal color (refer to table 21 & 22). If there are any alarms,

please contact with field engineer.

8. Push Enable Switch to DISABLE and push Circuit Breaker to OFF. Turn off power supply to

MCPA and rectifier. Write down installation record and check with field engineer for system

commissioning.