Nt8D53Ad Power Distribution Unit; Nt8D53Ca Power Distribution Unit Ac - Nortel Meridian 1 Hardware Replacement Manual

Page 188 of 250

NT8D53CA Power Distribution Unit AC

553-3001-520 Standard 17.00 January 2002
Replacing equipment
4 Grasp the lip at the top edge of the blower unit. Slide the unit out of the
glides and onto the bottom ledge of the pedestal. Lift the unit out of the
pedestal.
Note: Store the blower unit in an upright position.
Installing equipment
1 Set the replacement blower unit on the bottom ledge of the pedestal.
2 Tilt the back of the blower unit up slightly so it will slide into the pedestal
glides (you may need to lift the unit). Gently push the unit into position.
3 Tighten the screws on the front of the unit.
4 Turn on power to the blower unit:
— With AC power, set the circuit breaker to ON (up).
— With DC power, set the toggle switch to ON (right).
Note: On initial power up the blower may rotate slower than expected.
As the sensor detects heat, the blower will rotate more rapidly.
5 Fit the grill into the holes in the bottom ledge of the pedestal. Push the
grill back into a locked position.
6 Tag defective equipment with a description of the problem and
package it for return to a repair center.
Use this procedure to replace the power distribution unit (PDU) for
AC-powered systems.
DANGER
Module covers are not hinged; do not let go of the
cover. Lift the cover away from the module and set it
out of your work area.
Removing equipment
1 Turn off power at the distribution box. If the column is not hardwired,
unplug the power cable.
2 Remove the grill on the rear of the pedestal. Figure 29 on page 189
shows the location of the unit in the rear of the pedestal.