PHI D-4990, Manual, Page: 36 / 66

ENCODER: This is a combination of a magnet rotating on the shaft at the end of the
motor, and Hall effect transistors that send pulses to the control every time the motor
turns. When the door is powered up it will open slowly and allow the encoder and
processor to count the pulses from fully closed to fully open. These pulses are used to
indicate when a door should go into backcheck or when its at its open limit.
ENCODER PLUG
INPUT
110VAC
PLUG
3 AMP FUSE MOTOR PLUG RJ11 JACK
(Future use)
PLUG-IN CONNECTORS