Lift-master 90 EI User Manual

ELECTRICALLY INTERLOCKED

CONTACT OR MODIFICATION

90-EI

APPLICATION REQUIREMENTS:

This modification is available to Model T, GT,J , H, GH, SD and GSD standard door operators with 24V control circuits (M). It is not necessary on the single phase operators due to the standard “IR Relay” circuit.

FUNCTIONS

Additional control circuit components are supplied with this modification to prevent the OPEN coil of the reversing contactor from being electrically energized when the CLOSE coil is held in, and vice versa.

of standard procedure, this modification is necessary only to meet certain stringent architectural specifications, or where abuse of the operator at the control station may be expected.

NOTE: Since the reversing contactor is mechanically interlocked as a matter

WIRING:

Refer to the wiring diagram supplied with the operator. If this diagram is missing, or you are unsure of wiring requirements please call Technical Service @ 1-800-528-2806