18
A
B
Fig. 40
• Remove the vent screw (Fig. 40).
Fig. 39
Fig. 38
• Snap-fit the side panels, put the equipment's cover on
and secure it with the supplied screws (Fig. 39).
• After installation, apply the danger sticker to the top of the
cover (Fig. 38).
7. FINAL OPERATIONS
6.5.
MECHANICAL CLUTCH ADJUSTMENT
In addition to its electronic safety devices (encoder and
force adjustment), the 844 operator is also equipped with a
mechanical clutch.
The clutch doesn't need to be adjusted
in a typical application.
It comes from the factory set to its
maximum strength, and can be left as it is for the majority
of applications. To adjust the operator's thrust and reversing
behavior use the force and encoder settings, as detailed in
Sections 5.5.1 and 5.5.2.
In case the clutch needs to be adjusted:
1. Cut electrical power to the operator.
2. Keep the motor shaft locked with a wrench and turn the
clutch adjustment screw with an Allen wrench or screwdri-
ver as shown in Fig. 37 Ref. A.
- To increase torque, turn the screw clockwise.
- To reduce torque, turn the screw counter-clockwise.
3. Power up the operator and check that the torque you
have just set is correct.
The operator is supplied as standard with a clutch
adjustment spring for gates up to 2200 lbs. For heavier
gates, use the supplied alternative spring. For spring
replacement instructions, see Fig. 37 Ref. B.
Fig. 37
6.6.
TRAVEL LIMITS CHECK
Be careful when setting the post-limit-switch deceleration
and braking. If the deceleration is too long and braking is
insufficient, the magnet or steel plate fitted on the gate's rack
can overshoot the sensor until it is disengaged.
When the gate stops, check that the correct light limit-switch
is engaged. The relevant LED must be OFF. If it went OFF
and then ON again, or if both limit-switch LEDS are OFF, you
must reduce the post-limit-switch deceleration value and/or
increase the braking value (see Section 5.5.2).
6.7.
SAFETY DEVICES CHECK
Check for the correct operation of all safety equipment,
anti-crushing devices (ENCODER sensor), and accessories
used in the system.
