Seagate ST3390N Installationsanleitung Seite 291

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Troubleshooting startup problems 16-19
Power problems
Standard 1.0 Modular Option EC Installation and Maintenance Guide November 1999
Testing the pedestal
power supply
To test the pedestal power supply, follow these steps.
Universal DC pedestal, NT7D67CA
Step Action
1 Verify main DC voltage by measuring for –48 V DC to –52 V
DC.
a. To measure this voltage, use a volt/ohmmeter. Measure
between each BAT terminal (0/1, 2/3) and the corresponding
BATRTN terminal. See Universal DC pedestal, NT7D67CA
below (NT7D67CA PDU) and “DC pedestal, NT6D53AA” on
page 16-20 (NT6D53AA PDU).
b. If the voltage measured is incorrect, test the UPS system.
See
SL-1 Fault Clearing
(NTP 553-3001-510) for testing
procedures of the UPS.
2 If the voltage is correct, go to “Testing the power harness” on
page 16-20 and test the power harness at the lowest module
with no LEDs lit.
Volt/
ohm
meter
Measure between each BAT terminal (0/1, 2/3) and the corresponding BATRTN terminal.
BAT
0/1
BAT
2/3
BATRTN 0/1
BATRTN 2/3
LRTN
NT7D67CA
G101077
Rear of base
of pedestal
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