If the power supply does not move out of place, it is secured in the slot. If the power supply moves, carefully press
it all the way into the slot until it clicks in place.
c) Attach the Saf-D-Grid end of the power cable to the electrical outlet on the front of the power supply.
d) Make sure that the other end of the power cable is attached to the appropriate power source for the power supply.
• For an HVAC power source, plug the other end of the power cable into the power source.
• For a HVDC power source, verify that the circuit breaker is turned off and then connect each of the three cable
connectors to the appropriate DC and grounding terminals on the power source. If there is a cover plate for the
DC terminals, install the plate to prevent accidental contact with the terminals.
e) If using an HVDC power source, turn on the circuit breaker for the power source.
f)
Verify that the power supply is operational by making sure that the power supply LED is green.
Replacing a DC Power Supply
You can replace an DC power supply during operations so long as the other power supply provides power to
the switch.
Before you begin
• The replacement power supply must have the same wattage and airflow direction as the power supply
being replaced. Do not mix AC, DC, HVAC/HVDC power supplies in the same switch.
You can determine the airflow direction by looking at the coloring of the latch
on each power supply. AC power supplies with burgundy latches have port-side
intake airflow direction, and power supplies with blue latches have port-side
exhaust airflow direction.
Note
• An DC power source must be within reach of the power cables that will be used with the replacement
power supply. If you are using
n
+
n
power redundancy, there must be a separate power source for each
power supply installed in the chassis.
• There must be an earth ground connection to the chassis in which you are installing the replacement
power supply. DC power supplies connected to DC power sources have three power cables (two for DC
power and one for grounding).
• We recommend 8-AWG wire for DC installation in the U.S.
• All DC power supplies have reverse polarity protection. When you inadvertently connect the input power
(+) to the DC PSU’s – terminal and the input power – to the DC PSU’s (+) terminal, the PSU will not
be damaged and will operate fine after the input power feeds are correctly wired.
Step 1
Remove a DC power supply as follows:
a) Turn off the circuit breaker for the power feed to the power supply that you are replacing.
Be sure that the LEDs turn off on the power supply that you are removing.
Replacing Components
5
Replacing Components
Replacing a DC Power Supply
