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Rev C Doc 6001194 (01-20259) 18 of 36
PART 3
MODEL SL 1000-X1 OPTIONS
POWER FAIL OPERATION OPTION
The LiftMaster Power Fail Operation Option may be ordered pre-installed in new units, or can be
purchased separately for installation in LiftMaster gate operator systems in the field. The Power Fail kit
includes a DC motor, belt, battery, battery support bracket assembly (includes bracket, 3 control relays,
rectifier and wire harness) and mounting hardware. Features of the Power Fail Option are as follows:
• The Power Fail Operation system fully opens or closes the the gate (User's choice) one minute after
a power outage. The gate will remain open or closed until AC power is restored.
• When AC power is restored, the battery is charged up to its full potenial, then continuously trickle
charged. Recharging takes from one to five hours, depending on the weight of the gate and how far
it moved during the outage. The age of the battery also increases the battery charging time.
NOTE: Battery capacity decreases over time. Battery should be replaced every two or three years.
• The charging section and controls for the Power Fail Operation are located on the control board.
• The motor sensing potentiometers (Right reverse, Left reverse and Inrush) on the Gate Operator
board may require readjustment if the Power Fail Operation option is installed in the field.
• Gate speed may be slightly reduced with the Power Fail Operation option installed.
IMPORTANT NOTE
During a power outage, all Gate Operator safety features are
disabled and only the limit switches stop movement of the gate.