Removal; Replacement; Ac Drive; Ac Drive Motor Removal And Replacement - IBM 5280 Maintenance Information Manual

AC Drive
351
AC DRIVE MOTOR REMOVAL AND
REPLACEMENT
At
Drive Motor with External Fan
Removal
1.
2.
3.
Power off.
DANGER
Capacitor discharge voltage might be present at the
socket when the AC drive motor power cable is
disconnected.
Disconnect the AC drive motor power cable
fJ .
Remove the AC drive motor belt
&D.
The AC drive motor case becomes hot after continuous
use.
I
DANGER
4.
5.
Remove the two fan enclosure mounting screws
0;
then remove the fan enclosure
II .
Loosen the setscrew
II;
then remove the AC drive
motor fan and pulley
0 .
High voltage might be present at the capacitor terminals.
I
DANGER
6. Remove the two insulator caps
0
from the capacitor
terminals.
28 AC Drive
351
7.
8.
9.
Discharge the capacitor by jumpering its terminals
with a large-bladed screwdriver.
Remove the AC drive motor leads
II
from the capacito
terminals.
Remove the AC drive motor leads from the cable
guide
II
on the casting.
10. Remove the two insulator caps from the AC drive
motor leads.
11. Remove the two remaining mounting screws
1m
and
remove the AC drive motor
0 .
Replacement
To reinstall the AC drive motor, observe the following
exceptions and reverse the steps in the removal procedure.
1.
2.
3.
When installing the AC drive motor leads on the
capacitor, note the cable numbers to determine which
lead goes on which terminal.
When installing the drive fan and pulley on the AC
drive motor, ensure that the setscrew is centered on
the flat surface of the motor shaft.
Place the drive fan and pulley on the AC drive motor
shaft with a gap
1m
of 0.5 millimeter ± 0.1 millimeter
(0.020 inch ± 0.001 inch) between the motor face
and the fan hub.