Pub. No. 8000CLB FEBRUARY 2004
19
PROTECDOR® CL Model 8000CL
AIRGAP:
1.
In most applications, the brake needs practically no
maintenance. However after a long period of operation, or
if the brake has high duty cycles, adjustment of the air
gap may be necessary.
2.
Check the air gap with a feeler gauge in three positions.
Note: the air gap is shown in
Figure 33.
The normal
setting is .008”. When the maximum dimension of .015” is
exceeded, adjust the value back to the normal dimension
of .008” using the instruction in
Step 3.
3.
If air gap adjustment is necessary, loosen the bolts (9A),
rotate the adjustment tubes (8) approximately 1/4 turn,
retighten bolts (9A), and measure the air gap. If air gap is
not within tolerance, repeat procedure.
TORQUE:
1.
The brake is supplied from the factory with the nominal
torque setting. This torque can be reduced by unscrewing
the torque adjustment ring (3) with a spanner wrench. Do
not unscrew the ring further than it’s limit of .330” (approx.
5/16”) as shown as dimension “0”1 in
Figure 34.
2.
The torque adjustment ring has detent action with torque
variation of .443 ft-lb, per step.
BRAKE REPLACEMENT
1.
Run the door to the full open position and disconnect power
to the door. Make sure that the power source has been
locked and tagged out according to OSHA regulations and
approved local electrical codes. Barricade the work area on
both sides of the door to prevent unauthorized access while
servicing.
2.
Loosen the brake release handle by unscrewing it, then
loosen, but don’t remove the the three holding the cover
to the brake, this cover can be reused,
Figure 34.
3.
Disconnect the two white brake wires from the two blue
motor wires.
4.
Using a 9/16” wrench, loosen and remove the two bolts
holding the brake to the motor, note orientation before
removing. Pull the brake straight off the motor, use
extreme care when pulling the blue motor wires thru the
holes in the brake to avoid stripping the insulation.
5.
If the spline hub needs replacing, loosen the set screw.
When installing the new spline, be sure to use a thread
locking compound on the set screw and torque to 55 lb/in.
6.
Install the new brake by first inserting wires thru the hole
in the brake and carefully pulling them thru as the brake is
slid on, use extreme care to avoid pinching the wires
between the motor and brake.
7.
Thread the (2) 3/8” bolts thru the brake and into the motor,
torque to 22 lb/ft and reconnect the two white brake wires
to the two blue motor wires. Polarity is not important.
8.
Replace the brake cover and tighten the three screws.
9.
Screw the brake release handle on the brake and tighten.
10.
Make sure there is play in the handle and it does not
catch or drag on the brake cover.
11.
Reconnect power and check for proper operation.
BRAKE ADJUSTMENT
FIGURE 34
Remove 3/8” bolts
Brake Spline/Key
Motor/Brake Wires
Brake
Release
Handle
Brake Wires
FIGURE 33
