User's Manual

Pre-Initial Power-up Tests68P64115A18–1
Mar 2003
1X SC 4812T Lite BTS Optimization/ATP Software Release R2.16.1.x
DRAFT
2-7
NOTE
The procedure in Table 2-3 is required only on initial frame
power–up or following maintenance when any major power
components (e.g., ACLC, DC PDA, Meter Alarm Panel) were
replaced or internal DC power cables were disconnected.
Table 2-3: DC Power System Pre–Power Application Test
Step Action
1 Physically verify all AC power to the BTS is OFF and all DC PDA circuit breakers (Figure 2-4) are
set to OFF (pulled out).
2 On the DC PDA, set the MAIN BREAKER to the ON position by pushing it in. Resistance between
the MAP (–) VOLT TEST POINT and the (–) AMP TEST POINT should measure between 300 Ω.
minimum 900 Ω. maximum.
3
Before proceeding, be sure the SCCP shelf power/converter modules PS1 and PS2 are correct by
verifying that the locking/retracting tabs appear as follows:
–
(in +27 volt systems)
! CAUTION
Using the incorrect type of power/converter modules will damage the module, the SCCP shelf, and
other modules installed in the SCCP shelf.
4
NOTE
In the following steps, if the DMM reads between 300 Ω minimum and 900 Ω maximum after
inserting any board/module, a low impedance problem probably exists in that board/module. Replace
the suspect board/module and repeat the test. If test still fails, isolate the problem before proceeding.
Insert and lock the PS1 DC–DC converter module into its slot, and and turn ON the PS1 DC circuit
breaker on the DC PDA.
5 Resistance between the MAP (–) VOLT TEST POINT and the (–) AMP TEST POINT should
typically increase as capacitors charge, finally measuring between 300 Ω minimum and 900 Ω.
maximum.
6 Repeat steps 4 and 5 for the PS2 converter module/circuit breaker and all other remaining modules in
the SCCP shelf.
7 On the DC PDA, set the PA 1A–1B circuit breaker to the ON position by pushing it in, and repeat step
5.
8 Repeat step 7 for each of the three remaining PA circuit breakers.
9 Carefully reconnect each PA cable one at a time. Repeat step 5 after reconnecting each cable.
– A typical response is that the ohmmeter will steadily climb in resistance as module input
capacitors charge, finally indicating between 300 Ω minimum and 900 Ω. maximum.
10 Set the Pilot Beacon, both Heat Exchanger, ETIB, and Options circuit breakers to ON one at a time.
Repeat step 5 after pushing in each circuit breaker.
11 Set all DC PDA circuit breakers to OFF (pulled out).
2