LiftMaster HCTDCU HCTDCU Installation Manual - Page 18

Obstruction Test, Fine Tune The Force, Adjust The Limits

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ADJUSTMENT LIMIT AND FORCE ADJUSTMENT FINE TUNE THE FORCE The REVERSAL FORCE DIAL on the control board is used for fine tuning the force in cases where wind or environmental changes may affect the gate/door travel. Based on the length and weight of the gate/door it may be necessary to make additional force adjustments. The force setting should be high enough that the gate/door will not reverse by itself nor cause nuisance interruptions, but low enough to prevent serious injury to a person. The force setting is the same for both the open and close gate/door directions. 1. Open and close the gate/door with the TEST BUTTONS. 2. If the gate/door stops or reverses before reaching the fully open or closed position, increase the force by turning the force control slightly clockwise. 3. Perform the "Obstruction Test" after every force setting adjustment (see below). ADJUST THE LIMITS After both limits are set and the operator is ready to run, one limit can be adjusted independently from the other by following steps 1-3 of the Initial Limit and Force Adjustment section, on page 17. DIAGN OBSTRUCTION TEST 1 The operator is equipped with an automatic obstruction sensing feature. If the gate/door encounters an obstruction during motion, the operator will automatically reverse or stop the gate/door. After any adjustments are made, test the operator: 1. Open and close the gate/door with the TEST BUTTONS, ensuring that the gate/door is stopping at the proper open and close limit positions. 2 2. Place a solid object under the open gate/door. Ensure that the gate/ door, and the solid object can withstand the forces generated during this obstruction test. 3. Run the gate/door in the close direction. The gate/door should stop and reverse upon contact with the solid object. If the gate/door does not reverse off the solid object, reduce the force setting by turning the force control slightly counter-clockwise. The gate/door should have enough force to reach both the open and close limits, but MUST reverse after contact with a solid object. 3 4. Repeat test for open direction as necessary. 18

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1
FINE TUNE THE FORCE
The REVERSAL FORCE DIAL on the control board is used for fine tuning
the force in cases where wind or environmental changes may affect the
gate/door travel.
Based on the length and weight of the gate/door it may be necessary to
make additional force adjustments. The force setting should be high
enough that the gate/door will not reverse by itself nor cause nuisance
interruptions, but low enough to prevent serious injury to a person. The
force setting is the same for both the open and close gate/door
directions.
1. Open and close the gate/door with the TEST BUTTONS.
2.
If the gate/door stops or reverses before reaching the fully open or
closed position, increase the force by turning the force control slightly
clockwise.
3.
Perform the “Obstruction Test” after every force setting adjustment
(see below).
OBSTRUCTION TEST
The operator is equipped with an automatic obstruction sensing feature.
If the gate/door encounters an obstruction during motion, the operator
will automatically reverse or stop the gate/door. After any adjustments are
made, test the operator:
1.
Open and close the gate/door with the TEST BUTTONS, ensuring that
the gate/door is stopping at the proper open and close limit positions.
2.
Place a solid object under the open gate/door. Ensure that the gate/
door, and the solid object can withstand the forces generated during
this obstruction test.
3.
Run the gate/door in the close direction. The gate/door should stop
and reverse upon contact with the solid object. If the gate/door does
not reverse off the solid object, reduce the force setting by turning the
force control slightly counter-clockwise. The gate/door should have
enough force to reach both the open and close limits, but MUST
reverse after contact with a solid object.
4. Repeat test for open direction as necessary.
ADJUST THE LIMITS
After both limits are set and the operator is ready to run, one limit can be
adjusted independently from the other by following steps 1-3 of the Initial
Limit and Force Adjustment section, on page 17.
ADJUSTMENT
LIMIT AND FORCE ADJUSTMENT
DIAGN