EHJ Jackshaft type electric operator has been developed primarily as an operating mechanism for commercial-industrial door equipped with head shaft. Naturally doors of either sectional overhead, vertical lift, hy-lift or rolling steel construction are ideally suited for operation by this unit. Many othertypes of doors can be equipped with this operator, providing the door has a shaft as the basic driving element.
Three button control:
Momentary contact type for up, down and stop. Operator may be stopped in any position and door moved up or down from that position. Operator can be wired for constant pressure down when specified. Control circuit 24V. A.C. for user’s protection.
Adjustable automatic friction clutch:
To protect door and operator in case of obstruction.
Rugged power unit of this operator utilizes a large size V belt (5L) and heavy pulleys for primary reduction, roller chain and steel sprockets for secondary reduction to the output drive shaft. Pulleys and sprockets are mounted on 1″ (2.5cm) C.R. steel shaft rotating on high speed, precision, self-aligning pillow block bearings for efficient long lasting, hard working, high traffic operation. Door operating speed approx. 1.0ft. (.3m) per second.
Equipped with a disconnect device which allows a person to disengage the operator from the door and operate the chain hoist from the floor by hand in the event of power failure without having to remove the drive roller chain. Limit switches will not go out of adjustment when hoist is used.
To prevent door from coasting and secure locking of door in closed position.
Screw type friction free oilite bronze cams and precision micro switches, for both up and down automatic stopping of door position, easily adjustable without tools.
Heavy duty type STRUTHERS-DUNN or equal.
Electrical interlock switch automatically cuts power off on operator when chain hoist is in operation.
Right or left side.
Manual overload relay:
For overload and under voltage protection. (Can be reset manually).
1/3 H.P. (.33hp), 1/2 H.P. (.5hp), or 3/4 H.P. (.75hp), or 1 H.P., 115V. or 230V., 1 phase 208V., 440V. or 550V., 3 phase. (1 H.P. not recommended in single phase motors).
20″ (50cm) minimum.
Primed with rust-proof primer and spray painted in blue hammer tone enamel.