17
Figure 21
Clutch adjustment
5.4. ADJUSTMENT AND MANUAL OPERATION OF OPERA-MH OPERATOR
Opera-MH (designed with Hoist-a-Matic ® self engaging hoist system)
The Opera-MH operator is equipped with an automatic emergency chain hoist disconnect mechanism to
operate the door manually, no floor disconnect is required.
In one simple step
-
Control circuit interrupted.
-
Coupling and hoist engaged.
-
Manual
operations.
are successively completed by pulling the hand chain in the desired direction:
1. Simply pull on the hand chain in the desired direction. The first foot pulled will engage the hoist
mechanism and open the electrical circuit.
2. Continue the traction movement to move the door. If it doesn’t run in the desired direction, repeat actions
1 and 2 by pulling the chain in the other direction (See Figure 22).
3. The automatic hoist engagement system is adjusted in the factory. It may require adjustment in the field.
Adjustment is necessary if no door movement occurs after two fetes of pulled hand chain. Turn the
adjusting nut clockwise (see figure 23) by ¼ turn until the hoist engages after pulling one foot of chain. If
the nut is too tight, the manual torque on the chain will be too heavy.
4. Return to the standard electrical operation.
IMPORTANT:
To return to electrical operation merely pull slightly on the opposite direction of the chain
WARNING
DO NOT ATTEMPT TO DISENGAGE THE OPERATOR WHILE OPERATOR IS RUNNING. DO NOT
ATTEMPT TO MANUALLY FORCE A MALFUNCTIONING DOOR TO OPEN OR CLOSE. THIS IS AN
EMERGENCY DEVICE AND IS NOT DESIGNED TO OPERATE A DOOR WITH SERIOUS MECHANICAL
PROBLEMS
.
Figure 22
Operating chain to open and
close door
Figure 23
Manual operation system adjustment
Rotate the
nut to adjust
the clutch
Increase torque
Decrease
torque
Return in
electrical
operation
position
Engagement
Operation
