Features
1. press button operation, power-driven make shutter open and close,limit switch can control stroke accurately.
2. while no power-driven, pull the hand chain, the doors can be move up slowly, pull down the auto chain , the door can move down auto .
3. With remote control and password button,they can make the doors opened and closed.
4. With fire-proof electronic control boxes and smoke control and the temperature probe sensor, they can detect the fire, the smoke, meet the performance load GB14102-93 standard. 5. With different emergency doors settings,it can close the doors when no power and nobody.

The main parameters:
Power supply(V/Hz):380/50
Motor power(Kw):0.25
Max.lifting force(Kg):500
Drum diameter(mm):Ø140
Drum speed(R/Min):5.55
Max.hoisting height(m):4.5
Deadweight lowering weight(Kg):12
Gear ratio of big and small chain wheels(gears):50/50/9
Specification of bushroller chain:10A-1-128
Weight of main engine(Kg):12