1. Set MASTER SWITCH to OFF (see your -10).
2. Open front cover on ATCCS UPS Storage Box and
remove cable W42 plug P1 (1) from UPS jack DC IN.
3. Measure resistance between pins of plugs P2 (2) and
P1 (1) of cable W42 as follows:
P2 pin A to P1 pin A, E, and F
P2 pin B to P1 pin B, C, and D
1. Faulty ATCCS UPS Power.
2. Notify your supervisor.
1. Replace cable W42
2. Verify no faults found.