Doorlec EHJ

SKU: EHJ Category:


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.
Chain hoist
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.
Solenoid brake
To prevent door from coasting and secure locking of door in closed position.
Limit switches
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.
Reversing contactor
Heavy duty type STRUTHERS-DUNN or equal.
Safety interlock
Electrical interlock switch automatically cuts power off on operator when chain hoist is in operation.
Universal mounting
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).
Sideroom required
20″ (50cm) minimum.
Primed with rust-proof primer and spray painted in blue hammer tone enamel.


Three button control
Momentary contact type open, close and stop, full guarded standard duty 600V. A.C. maximum. Screw type terminals.
Adjustable automatic friction clutch
4″ diameter aluminium disc attached to rotating shaft to one side of which a 4″ x 1/8″ (10cm x .31cm) non-flammable fiber clutch material is applied. One 8″ (20cm) H.D. V belt pulley is compressed by means of a heavy compression spring and castelated threaded nut, securely locked with 3/16″ (4.8mm) cotterpin. Friction clutch system can be adjusted as required depending on door size and weight. Clutch will protect door and operator in case of obstruction.
Motor control
Heavy duty reversing contactor STRUTHERS-DUNN or equal, two sets of three pole contactors on a common frame, mechanically interlocked to prevent simultaneous closure, clapper type armature with three point suspension auxiliary contacts DPDT on each armature, coils 24V. A.C. amps resistive 120V. A.C. 15 amps, 240V. A.C. 10 amps, 550V. A.C. 5 amps. Motor 1 H.P. maximum, terminals .250″ (.625cm) quick connect, mechanical life 10 million cycles.
This extra rugged power unit drive, utilizes one 5L V belt, one 2″ (5cm) and one 8″ (20cm) type B die cast aluminium alloy pulleys balanced for smooth operation, for primary reduction. Five 41B12 and three 41B36 steel sprockets with RC41 and RC40 roller chain (all sprockets pinned or keyed on 1″ (2.5cm) C.R. steel shaft) rotating on six 1″ (2.5cm) precision self-lubricating, self-aligning, high speed pillow block bearings, for secondary reduction to the output drive shaft. Door operating speed approx. 1.0 ft. (.3m) per second.
Unit chassis
Heavy steel frame assembly is made from 2″ x 2″ x 1/8″ (5cm x 5cm x .31cm) H.R. steel angles reinforced with steel plates, welded together for greater strength.
Limit switches
Screw type friction free oilite bronze cams, grooved and lock guided in a spring loaded formed galvanized steel plate. Cams are fitted on 5/8″ x 10-3/4″ (2.05cm x 26.88cm) C.R. threaded N/F steel shaft, rotating on lubricated high speed ballbearings. Cams on their preset travel activate the micro switches to cut power off motor control in both open and close direction of door. Operating force on limit switch 4 oz. (113.4g) maximum, contact separation .020″ (.05cm), termination .250″ (.625cm) quick connect.
Manual overload relay
Protects operator from overload and under voltage current. Can be reset manually.
Electrical control cabinet
Factory pre-wired made from 14 ga. H.R. steel pre-formed enclosure size 8″ x 10″ x 4-1/2″ (20cm x 25cm x 11.25cm) with removable cover for easy service and maintenance. Mounted on unit chassis with 4 zinc plated steel bolts.
25 V.A. step down transformer
120V. A.C. primary to 24V. A.C. secondary
240V. A.C. primary to 24V. A.C. secondary
208V, 460V, 600V. A.C. primary to 24V. A.C. secondary
Emergency chain hoist
Combined with a floor operated disconnect which when pulled will disconnect the electric driven solenoid brakes and engage the chain hoist for manual operation in the event of power failure, without having to remove the main drive chain. Assembly consists of one grooved aluminium pocket wheel, lever arm, one coupling, 1/8″ (.31cm) D. pull cable, 7/16″ (11.1mm) D. bright polish chain, wall chain keeper and disconnect arm.
Heavy duty solenoid brake
Made from one 4″ (10cm) diameter aluminium alloy disc mounted on keyed motor shaft, brake lined shoes with 360o exterior compressing force, throw spring loaded mechanism. Brake disc stops door when electro-magnetic solenoid switch is released. Mounted on heavy duty steel plates protected in 14 ga. steel enclosure. Brake mechanism is self-adjusting type.
Safety electrical interlock
When chain hoist is in operation a normally off toggle switch cuts the power line off operator automatically. This safety electrical interlock will protect operator and door when is restored and push button station is pressed accidentally.
Rated for continuous duty (capacitor starts on single phase models) 1/3 H.P. (.33hp), 1/2 H.P. (.5hp), or 3/4 H.P. (.75hp) or 1 H.P., 115V. or 230V., single phase, 208V., 440V. or 550V., three phase. 1725 R.P.M. ballbearings permanently lubricated, frame rigid type 56, shaft 5/8″ (2.05cm) diameter. 1 H.P. not recommended on a single phase motor. Other voltage available on request.
Unit is factory pre-wired colour coded and tagged. Wiring diagrams are enclosed with each operator. Operator is pre-run and tested before shipment.