GRLS 48 Ratio 4C IP55
Introduction
Model Name: GRLS/48/SH/4/55
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 48 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
Technical Data :
| Body Material | M.S |
|---|---|
| protection Degree | IP- 55 Confirming To is- 1394 (part) - 1993 |
| Gear Ratio |
48 : 1
60 : 1
96 : 1
|
| Cable Entries | Worm Drive |
| Cable Entries | 2 x 3/4 Conduit |
| Contact Material | Single / double Break Silver Cadmine |
| Rated Voltage Insulation | 500 V.A.C. |
| Thermal Test Current | 10 Amps. / 40Amps. |
| No. Of Contacts | 2 NC Or 4 NC (2NO + 2NC) |
| Cam Setting | Adjustable Worm Drive |
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 1:48 ratio variant with 4 contacts in an IP55 enclosure, suited to dust and weather protected installations.
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 1:48. Enclosure protection options: IP41 (indoor fabrication bays) and IP55 (dust and weather protected).
The GRLS Rotary Geared Limit Switch We Manufacture
Photographs of the GRLS series rotary geared limit switch in the IP55 enclosure, built at our works.
