
16-20 Troubleshooting startup problems
Power problems
Standard 1.0 Modular Option EC Installation and Maintenance Guide November 1999
DC pedestal, NT6D53AA
Testing the power
harness
To test the power harness, follow these steps.
To CB0
(UEM 0)
and CB5
(blower)
To CB2
(UEM 2)
To CB1
(UEM 1)
To CB3
(UEM 3)
TB1 in pedestal
To connections in PDU
—
BAT0
—
BAT1
—
BAT2
—
BAT3
+
BRTN0
+
BRTN1
+
BRTN2
+
BRTN3
LGND LRTN
0011
2
Volt/
ohm
meter
Measure between each BAT terminal (0/1, 2/3) and the corresponding BATRTN terminal.
G101078
Step Action
1 Check the DC voltage at DCEPS connectors (see “Front view
of module, DCEPS or CEPS removed” on page 16-21).
a. Switch off both DCEPS on the module.
b. Remove both DCEPS.
c. Check the voltage at the pins shown in “Front view of
module, DCEPS or CEPS removed” on page 16-21.
d. If the voltage is not in the range of –48 V DC to –52 V DC,
refer to
SL-1 Fault Clearing
(NTP 553-3001-510).
2 If the voltage is correct, continue with “Testing the DCEPS” on
page 16-21.
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