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Rev J Doc 01-20098 Page 37 of 44
RADIO RECV Convenience terminals provide power and contact connection for a
radio receiver. Activation is the same as CYCLE.
OBSTRUCTION ALARM (TB17)
Relay contacts close to provide 24VDC alarm power if the gate has two
consecutive obstruction faults.
LOW BATTERY/ NO AC POWER (TB18)
LOW BATTERY Activation fully opens or closes the gate, depending the setting of
Switch S3.
NO AC POWER Activation registers the date and time of power outages in the gate
operator transaction buffer.
24VAC OUTPUT (TB7) Terminals provide power (24VAC, 200mA) for peripheral
devices.
MAGLOCK INPUT (TB4)
MAGLOCK Relay contacts close when the gate is fully closed.
SLAVE I/O INPUT (TB1)
SLAVE I/O Input/output terminals are used to control a second gate operator in a
Master/Slave system.
PHONE LINE (J9) Terminals connect the telephone line to the gate operator.
ADJUSTMENTS
OBSTRUCTION Adjustable pot controls gate sensitivity to blockages by the
RIGHT (R69) instantaneous rise in motor current. When the limit is exceeded, the
gate reverses a programmed distance (minimum 2 inches).
OBSTRUCTION Adjustable pot controls gate sensitivity to blockages by the
LEFT (R160) instantaneous rise in motor current. When the limit is exceeded, the
gate reverses a programmed distance (minimum 2 inches).
NOTE: LiftMaster gate operators have two obstruction sense adjustments (left and right)
where other gate operators have only one. This allows greater flexibility
of installation. For instance, you can install a gate on an incline and not
worry about sacrificing downhill gate sensitivity.
START-UP Adjustable pot controls the delay in sensitivity to gate
(R203) obstructions. This delay in sensitivity prevents the initial motor
inrush current from causing a obstruction fault. The weight of the gate
determines this setting.
CONNECTORS
LIMIT SWITCH (J4) Connector for the left/right limit switch cable.
PWR INPUT (J1) Connector for AC input power.
MOTOR POWER (J3) Connector for the motor cable.
LOOP DETECTOR Connector for the optional LiftMaster Outside Interrupt Loop
(J15) detector add-on board.
LOOP DETECTOR Connector for the optional LiftMaster Inside Interrupt Loop
(J12) detector add-on board.
LOOP DETECTOR Connector for optional LiftMaster Shadow Loop detector add-
(J13) on board.
LOOP DETECTOR Connector for optional LiftMaster Exit Loop detector add-on
(J14) board.
OBSTRUCTION Connector for factory-installed alarm.
(TB17)