GHW-3 jackshaft worm-gear electric door operator is ideally suited for locations where atmosphere contains dust, oil, water or liquid vapours. Custom designed mainly for large rolling curtain doors, vertical-lift doors, stacking type doors and small sliding hangar doors
Worm gear reducer, single stage, running in an oil bath, 40:1 ratio, C flange design, cast iron alloy housing. No. 60 roller chain and sprockets from operator shaft to door shaft. Door speed: 7″ (18cm) per second approx.
Adjustable Torque Limiter:
Will protect door and operator in case of obstruction (optional at extra cost).
Rotary type with oilite bronze cams and precision micro switches for automatic stopping of door in open or closed positions (easily adjustable without tools).
Heavy duty type.
Three Button Control:
Momentary contact type for open, close, stop. Operator may be stopped in any position and door opened or closed from that position. Close button can be wired for constant pressure when specified. Control circuit: 24V. A.C. for user’s protection, Class II.
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.
Electrical interlock switch automatically cuts power of operator control when chain hoist is in operation.
Left and right (must be specified). Right hand shown.
Manual Overload Relay:
For overcurrent and under voltage protection (manual reset).
3 H.P. (2239W) 208V., 230V., 416V., 460V., 550V. Three phase (single phase not available).
24″ (61cm) minimum.
Primed with rust-proof primer and spray painted in blue hammertone enamel.