Counter Wiring for A LiftMaster Operator - DDM Garage Doors Blog

Posted December 18th, 2020 at 5:55 pm by Dan Musick

An operator counter tracks door cycles: one opening plus one closing equals one cycle. To track the usage of a door, counters are often installed on the operators.

An image of  a LiftMaster operator with an external counter showing 196,491 cycles.
This 24-volt counter shows that the operator has cycled 196,491 times.

One of the more common reasons to track door cycles is to schedule maintenance before repairs are needed. For example, if overhead sectional door springs are rated at 20,000 cycles, the counter can predict when the springs will break. Replacing springs before they break allows the customer to avoid downtime costs.

The wiring for a counter on a LiftMaster operator is simple. Twenty-four volts travels from the control board to the counter with a normally open auxiliary limit switch blocking the current.

A wiring diagram showing how a counter should be wired.
Wiring from the operator control board on a LiftMaster operator through the normally open auxiliary switch activates the counter when the switch arm is pressed.

The top two screws on the LiftMaster Logic 5 control board provide the 24 volts for the counter.

A LiftMaster Logic 5 control board with the top two screws circled in red indicating 24 volt connections.

One wire from the board is wire-nutted to the counter wire; the other wire runs through the normally open auxiliary switch.

An image of an installed limit switch.
As the door opens, the white grooved limit nut slides to the left and presses in the switch arm. This closes the contacts on the normally open switch to activate the counter.

There are a number of ways to mount the switch. One way is to use long screws and washers or small tubes to align the switch with the limit shaft.

A side view of a limit switch installed through two small tubes.
Mounting the switch required drilling two holes in the bottom of the case.

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