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2.2.5 Brake Assembly
Service Check
CAUTION
Do not rotate the disk spindle counterclockwise;
head damage can occur.
1.
Turn power off at the operator control panel.
2.
After the power is sequenced down, turn
the mainline power off at the back of the
machine.
Check for 0.008 inch ± 0.005 inch
(0.203 mm ± 0.127 mm) at gap
13
Adjustment
1.
2.
Lock the actuator with the actuator lock
a
by moving the handle to ON.
Remove the belt guard by loosening the
two screws
11
and lifting it off.
3.
Loosen the two screws
IJ
holding the
spindle locking arm, and slide the locking
arm toward the disk spindle.
4.
5.
6.
7.
8.
Turn the motor pulley clockwise until the
stud on the disk spindle sits in the slot in
the locking arm.
Tighten the screws on the spindle locking
arm.
Lift the motor to release tension on the
belt, and remove the belt
m .
Remove the motor wires from D ETB 1
B
terminal 1 (blue wire), terminal 2 (white
wire), and terminal 3 (two yellow/green
wires).
I
DANGER
Make sure the disconnected wires are away
from TB1.
Unplug the fan above the motor.
9.
Loosen the brake adjustment locking screws
GI
10.
Turn the adjusting studs
D
clockwise,
one turn at a time, each time tightening
the locking screws until the brake pad
Ii)
is tight against the brake plate
Ii .
11.
Back off the studs as evenly as possible
(keep locking screws tight), and adjust for
a 0.008 inch ± 0.002 inch (0.203 mm ±
0.051 mm) gap
II
between the brake pad
and the coil. Check at the three gaps in the
brake housing moulding.
12.
Tighten the locking screws
m
and check
that the adjustment
13
is now 0.008 inch ±
0.002 inch (0.203 mm ± 0.051 mm).
13.
Turn power on at the mainline switch and
at the operator control panel.
14.
DANGER
220 Vac present on TB1. With the brake
coil energized, the gap
0
between the
brake pad and the brake plate should
be 0.008 inch ± 0.002 inch (0.203 mm ±
0.051 mm).
15.
Turn the motor pulley to check if the
motor is free from binds. Gap
D
can
now be 0.008 inch
±
0.005 inch (0.203
mm
±
0.127 mm).
16.
Turn power off at the operator control
panel. After the power is sequenced down,
turn the mainline power off at the back
of the machine.
17.
Install the motor wires from DETB1
m
terminal 1 (blue wire), terminal 2 (white
wire), and terminal 3 (two green/yellow
wires).
18.
I nstall the safety cover on TB 1 (holes to
the left).
19.
CAUTION
Make sure the belt does not contact the
disk speed transducer.
Replace the belt (smooth side of the belt
against the pulley).
20.
Check that the belt is centered on the
pulleys.
21.
Replug the fan above the motor.
22.
Adjust the motor antistatic brush.
2-18
Note:
If there is a wear crater on the motor
antistatic brush, realign the crater to the
motor shaft. Check for 60 ± 20 grams.
Adjust, if necessary, by removing and
forming the brush.
23.
Loosen the two screws
I)
holding the
spindle locking arm. Slide the locking arm
away from the disk spindle.
24.
Make sure the spindle antistatic brush is
contacting the center of the spindle.
Note:
If there is a wear crater on the anti-
static brush, realign the crater to the spindle.
25.
Tighten the screws on the spindle locking
arm.
26.
Check that the spindle antistatic brush
has a pressure of 60
+
25 - 20 grams on
the center of the spindle. Adjust, if
necessary, by removing and forming the
brush.
27.
Install the belt guard. Slide the belt guard
all the way to the left, and tighten the
screws
0 .
28.
Unlock the actuator by moving the handle
a
to OFF.
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