Gunatit Electropower Private Limited

Weight Operated Limit Switches are used on control / power circuit of reversing drives so as to limit their rotation / movement within a predetermined position.

Operation:

When the snatch block of the crane reaches its top position the snatch block pushes a plate which is hanging from one end of the lever of the limit switch. Due to the weight placed on the other end of the lever this lever is pushed up. When the lever is pushed up the shaft to which this lever is connected rotates there by rotating the cams which eventually open the contacts and disconnect the motor. The electronic limit switch contacts are automatically reset when the lever returns to zero position due to gravitational force.

Application:

The new range of limit switches has been designed and manufactured according to safety standard are suitable for use on reversing drives such as hoists, cranes, winches and rolling mills.

Design:

The driving motion is transmitted by worm gear. All gears and hubs are made of low wear thermoplastic. The rotational movements are transmitted to switches by adjustable cams.

Driving cams:

Each lever has a single micro metric resister screw. This screw exclusively works on its own combined lever, excluding any mechanical contact with any other next to it. The regulation is easily made by use of screwdriver on a register screw. The special friction system assures a rapid and precise adjustment.

Technical Data:

• Body Material : Black Nylon
• Cover Material Yellow : Impact proof thermoplastic
• Protection Degree : IP-55
• Mounting Position : Any
• Gear Ratios : 1:12.5, 1:25, 1:50, 1:100, 1:200 & 1:400
• Drive : Worm Drive
• Cable Entries : 2, 3/4" Conduit
• Maximum Rotation Speed : 1200 rpm
• Contact Material : Double break silver cadmium
• Wire Connection : Screw terminal
• Rated Voltage Insulation : 500 V.A.C
• Thermal Test Current : 10 Amps