GRLS 60 Ratio 2C IP41
Introduction
Model Name: GRLS/60/SH/2/41
Rotary limit switches are directly attached to the gearbox of the motor with a shaft and a coupling. The coupling helps in relieving stress to the shaft of the limit switch in case of Misalignment . The movement of the gearbox rotates the shaft of the limit switch .
Working of GRLS 60 Ratio
Rotary Geared Limit Switch GRLS is used to trip motor supply when the moving loads reach the extreme end positions of working zone. The driving motion is transmitted by worm gear through worm shaft. The rotations and movements are transmitted to switches by adjustable cams.
Applications of Rotary Geared Limit Switch
Rotary Limit Switches are used whenever you need to count the angle or number of rotations and stop a rotating piece of equipment when it reaches it rotating limit.
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EOT Cranes
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Electric Hoists
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Gantry Cranes
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Goliath Cranes
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Mobile Cranes
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Tower Cranes
Anand Rotary Geared Limit Switch Technical Data Specifications
| Body | Black Nylon | |
|---|---|---|
| Material Cover | Shock Resistance Thermoplastic | |
| Protection Degree | IP-55 Confirming to IS-13947(Part-1)1993 :Dust ingress and protect against low pressure water jet from any direction. | |
| Gear Ratio | 1:12.5, 1:25, 1:50,1:100 & 1:400 | |
| Drive | Worm Screw | |
| Cable Entries | 2, 3/4 Conduit | |
| Rated Voltage Insulation | 500 VAC. | |
| Thermal Test Current | 10Amps | |
| Maximum Speed | 1200 rpm | |
| Wire Connection | Screw Terminal |
Gear Ratio Sizing & Cam Setting Guidelines
The Rotary Geared Limit Switch (GRLS) connects directly to the crane hoist drum shaft or pinion drive. As the rope drum rotates, internal reduction gearing turns adjustable multi-lobed cams which trip individual snap-action contactors at preset top and bottom travel limits. This model is the 1:60 ratio variant with 2 contacts in an IP41 enclosure, suited to indoor fabrication bays.
Gear Ratio Calculation
To calculate the required gear ratio for your crane hoist:
Ratio (i) = (Total hoist lift height in metres) / (π × drum pitch diameter in metres × useful cam rotation)
Available standard ratios: 1:48, 1:60 and 1:96 — this page covers 1:60. Enclosure protection options: IP41 (indoor fabrication bays) and IP55 (dust and weather protected).