Replacing A -48-Volt Dc Power Supply - 3Com 3CB9E7 - CoreBuilder 9000 Chassis Switch Getting Started Manual

Remove the power supply.
5
Using a flat-blade screwdriver, loosen the
a
spring-loaded screws that secure the power supply
to the back of the chassis.
Grasp the power supply handle.
b
Pull the power supply straight out from the chassis,
c
making certain that you do not damage the
connectors on the rear of the power supply or the
connectors on the chassis backplane.
CAUTION: To ensure against damage to the
connectors, while you pull the power supply straight
out of the chassis, put one hand under the bottom of
the power supply to support it.
Replacing a –48-volt DC Power Supply
To install a new –48-volt DC power supply:
With one hand, grasp the power supply by the
1
handle; put your other hand beneath the power
supply to support it; and face the back of the chassis.
Carefully slide the power supply unit into the selected
2
power supply slot.
With the handle (Figure 27), gently push the power
3
supply inward until the power supply connectors and
backplane connectors engage.
You feel a slight resistance as the connectors engage.
Removing and Replacing a Power Supply
CAUTION: If the resistance is too great, the power
supply connectors and the backplane connectors may
not be aligned properly. Do not force the power
supply into the slot or you can damage the
connectors. If necessary, remove and reinsert the
power supply, ensuring that the connectors are
aligned.
To secure the power supply to the chassis, tighten the
4
four spring-loaded screws to a Torque Specification of
from 5 to 7 inch-pounds.
Before you attach the 8 AWG gauge wire to the
5
power supply, verify that the power supply's
Standby/On switch is in the Standby position.
Remove the recommended amount of insulation from
6
the 8 AWG gauge wire (Figure 30).
Figure 30 8 AWG Gauge Wire and Recommended Strip-back
8 AWG gauge
69
9mm
(.36 in.)