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:
Will protect door and operator in case of obstruction.
Screw type with oilite bronze cams and precision micro switches for both up and down automatic stopping of door positions. (Easily adjustable without tools).
Heavy duty type STRUTHERS-DUNN or equal.
The 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, mounted on 1″ (2.5cm) C.R. steel shaft rotating on high speed, self-lubricating, self-aligning pillow block bearings for efficient long lasting, hard working, high traffic operation. Door operating speed approx. 1.0ft. (.3m) per second.
Cast aluminium alloy chain driven carriage, slides on dual heavy steel angle tracks, with full No. 41 push and pull roller chain, for smooth and quiet operation. In addition a roller spreader is provided to support trolley and prevent chain from rubbing.
Quick release door arm:
Quickly disengages operator from door (without tools) for manual operation in the event of power failure.
1/3 H.P. (.33hp), 1/2 H.P. (.5hp), or 3/4 H.P. (.75hp), 115V., or 230V., 1 phase – 208V., 440V. or 550V., 3 phase. (1 H.P. not recommended on single phase motors).
Manual overload relay:
For overload and under voltage protection. (Can be reset manually).
Electro-mechanical instant reverse or stop:
This built-in door load sensing device is optional equipment (at extra cost). If downward travelling door meets an obstruction, door will instantly reverse and automatically stop at fully open position or, when specified, can be wired to door stop only. This system eliminates the use of air hose, air switch, retractable cord, etc.
To prevent door from coasting and holding in any position.
2-1/2″ (62.5cm) minimum from door’s highest arc of travel.
4’7″ (137.5cm) plus door height.
Primed with rust-proof primer and spray painted in blue hammer tone enamel.