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Step
Task (continued)
Replace the safety cover and tighten the captive screw with a #2 Phillips screwdriver
8
Figure 8-7. Reinstalling the PEM Safety Cover
Check that the over-current protector (located on the PEM front panel) is in the OFF position.
9
Energize the remote power source. The Voltage LED should be green. If it is amber, the -48 VDC and Return cables
are connected incorrectly or are reversed.
Go to
DC Power Supply and Fan Operability
10
DC Power Supply and Fan Operability Test
After you have completed the fan tray and PEM installation, verify their operability by supplying power
to the chassis and verifying the status LEDs.
NOTE: If there is a DC PEM failure, the entire PEM must be replaced. There are no field-serviceable parts
inside the DC PEM unit.
Before you begin this power test, inspect your equipment rack and chassis. Verify that:
• Each PEM is properly installed and grounded.
• The safety covers are installed on each PEM.
WARNING: Prevent exposure and contact with hazardous voltages. Do not attempt to operate this system
without the safety cover provided with each DC PEM.
• Your power cables connect to an appropriate DC supply in a manner that complies with your local
electrical codes. For DC systems, a Main Disconnect must be provided.
• On the DC PEM(s), use a voltage meter to verify power on the cables. Also verify that the Voltage LED
is green.
• A power supply blank is installed in any empty slot.
40
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Installing DC Power Supplies
Test, next, to complete the installation.
(Figure
8-7).
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