Replacing a High Voltage (HVAC/HVDC) Power Supply
You can replace an HVACHVDC 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. HVAC/HVDC power supplies have white latches, which
indicate that they have dual airflow directional capability. Those power supplies
automatically use the same airflow direction as the fan modules installed in the
same switch.
Note
• An HVAC/HVDC power source must be within reach of the power cable 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. HVAC/HVDC power supplies connected to AC power sources are automatically grounded
by their power cable when connected to the power supply and AC power source. HVAC/HVDC power
supplies connected to DC power sources have Saf-D-Grid power cables with three connectors on the
power source end--you connect one of those connectors to the earth ground.
Step 1
Remove an HVAC/HVDC 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.
b) Remove the power cable from the power supply by pressing the tab on the top of the Anderson Power SAF-D-Grid
connector and pull the cable and connector out of the power supply.
c) Grasp the power supply handle while pressing the colored release latch towards the power supply handle.
d) Place your other hand under the power supply to support it while you slide it out of the chassis.
Do not touch the electrical connections on the back side of the module and prevent anything else from
coming into contact with and damaging the connectors.
Caution
Step 2
Install the replacement power supply as follows:
a) Holding the replacement power supply with one hand underneath the module and the other hand holding the handle,
turn the power supply so that its release latch is on the right side and align the back end of the power supply (the end
with the electrical connections) to the open power supply slot before carefully sliding the power supply all the way
into the slot until it clicks into place.
If the power supply does not fit into the open slot, turn the module over before sliding it carefully into the
open slot.
Note
b) Test the installation by trying to pull the power supply out of the slot without using the release latch.
Replacing Components
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Replacing Components
Replacing a High Voltage (HVAC/HVDC) Power Supply
