The Genie 32987A.S is a genuine OEM optical interrupt wheel (encoder wheel) installed on the motor shaft of select IC/PMX family Genie residential garage door openers. It generates optical pulses as it rotates past an IR sensor, providing feedback for door speed monitoring, precise travel control, and safety reversal functions. This part differs from the Genie 33944A.S optical interrupt wheel, which is designed for the Excelerator Pro99, CMD9900, ISD990-1, ISD990-2, and ISD1000-2 series. The 32987A.S is specific to the IC/PMX opener generation. Legacy catalog reference 50-32987A refers to the same component.
| Feature | Specification |
|---|---|
| Model | Genie GE-32987A.S |
| Item Type | Optical Interrupt Encoder Wheel |
| Mounting | Pressed or keyed onto motor armature shaft within powerhead |
| Alternate Part Numbers | 50-32987A, GE-32987A.S |
A: The optical interrupt wheel is mounted on the motor shaft and interrupts a light beam in the optical sensor as it rotates. The control board counts the interruptions to track door position and detect obstructions.
A: No. GE-32987A.S fits the IC/PMX opener family. The Excelerator Pro99, CMD9900, ISD990-1, and ISD990-2 series require 33944A.S, which is a different generation and size (2-1/16 in. dia, 9/16 in. deep).
A: Symptoms include the door not reversing when it should, erratic door stopping positions, or the opener displaying fault codes related to position sensing or motor feedback.
A: 50-32987A is a legacy or alternate catalog number for the same part GE-32987A.S.
A: The optical interrupt wheel is mounted directly on the motor armature shaft, inside the powerhead, and works in conjunction with an optical sensor (photointerrupter) on the control board.