Lift-master DH User Manual

APPLICATION REQUIREMENTS:

This wiring modification is available to models H and J Logic operators.

FUNCTIONS:

This modification stops the operator from running when extra tension is sensed on the door from the mechanical door lock, obstruction or extensive binding.

OPERATION:

When unit senses load running open from close limit, Lock Sensor will stop operator. Press close button and run until it shuts off (to unlock door when load removed).

NOTE:

Refer to addendum for wiring and locksensor adjustment, for all other installation instructions refer to owner’s manual provided with operator.

ADDENDUM

LOCK SENSOR (LOGIC 3)

Models: DH, DJ, and DHJ

FINE ADJUSTMENT

• To increase opening force, tighten wing nut.

• To decrease opening force, loosen wing nut.

COURSE ADJUSTMENT (IF REQUIRED)

1.Release spring pressure on pivot arm.

2.Loosen but do not remove two mounting screws.

3.Fully tension final reduction chain and rotate lock sensor until switch is in activation mode.

4.Tighten mounting screws (2) to secure lock sensor position.

5.Repeat fine adjustments.

LOCK SENSOR ADJUSTMENT

Moving parts my cause SERIOUS INJURY. Keep hands CLEAR of sprockets, chains, and other moving parts when making adjustments.

WARNING

Final Reduction Chain

Chain Idler Sprocket must engage top side of reduction chain.

Mounting Screws

Lock Sensor Assembly

Lock Sensor Switch (held to normally closed).

To adjust opening force tighten or loosen adjustment on wing nut accordingly.