FG12.5P4: 4-Contact Limit Switch with 1:12.5 Gear Ratio

Introduction: Model FG12.5P4

The Model FG12.5P4 is a specialized version of the 4-contact rotary limit switch, featuring a **1:12.5 gear ratio**. This lower gear ratio makes it exceptionally suited for applications where the input shaft undergoes fewer rotations to complete its full range of motion. It provides highly precise and responsive control over shorter distances of travel.

3D Model of the FG12.5P4 Rotary Limit Switch with 1:12.5 gear ratio
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Working Principle of FG12.5P4

The FG12.5P4 utilizes a worm drive mechanism to transfer rotation to its four internal cams. The **1:12.5 gear ratio** means that for every 12.5 rotations of the input shaft, the cams complete one full rotation. This allows for very fine and accurate adjustment of the four switching points within a relatively small operational range.

This precision is ideal for setting multiple actions, like slowdown, stop, and alarm signals, in applications where the total travel distance is limited but high accuracy is paramount.

2D Technical Drawing of the FG12.5P4 showing its internal cam mechanism

Applications for FG12.5P4 (1:12.5 Ratio)

This model is specifically useful for machinery requiring precise control over a limited range:

  • Short-travel Hoists: For workshop hoists or specific lifting tasks with low headroom.

  • Machine Tool Positioning: For controlling the position of tool heads or workpieces.

  • Valve Actuators: For precise control over the opening and closing of industrial valves.

  • Automated Guided Vehicles (AGVs): For controlling specific mechanical actions like lifting forks.

FG12.5P4 Technical Specifications

Feature Specification
Gear Ratio 1:12.5
Number of Contacts 4 Contacts (4NO or 4NC)
Body Material Black Nylon / Nylon
Cover Material High-Impact, Shock-Resistant Thermoplastic
Protection Degree IP-55 (as per IS-13947 Part-1, 1993)
Rated Insulation Voltage 500 VAC

Warranty & Support

The FG12.5P4 is covered by a 1-year manufacturer warranty from the date of dispatch.

Contact for Quote or Technical Information:
For technical consultation and pricing, please contact the sales team. Call 91376-20579, email info@anandcontrol.in, or visit the website at www.anandcontrol.in.

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FG12.5P4

Introduction

Model Name: FG12.5P4
FG12.5P4 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 .

FG Rotary Geared Limit Switch
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Working principle of FG12.5P4

A FG12.5P4 works on the principle of a worm drive . A worm drive mechanism is suited so that enough torque is generated to move the attached gears within the limit switch . the shaft of the limit switch has threads which are matches and attached to a helical gear.

As the shaft rotates , the gear rotates according to the gear ratio. The gears are attached to a cam mechanism which rotate along with the central gear, a rotary limit switch has a minimum of two cams , one for setting the upper limit of the hoist machinery and one for setting the lower limit of the hoist machinery .

Screws are provided for each cam .Each cam can be adjusted according to user requirements to fine tune the upper and lower limit these cams operate the contacts within the limit switch.

After the cam adjustment is done according to the user , as soon as the hoist machinery reaches the upper vertical limit, the cams operate the contacts which stop the moving machinery . The contacts can be of normal closed (NC) or normally open (NO) type. Once any limit is reached by the EOT crane , the crane will only be able to move in the opposite direction thus preventing an accident.

Lever Limit Switch Working Principle

Applications of FG12.5P4

FG12.5P4 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.

  • EOT Cranes

  • Electric Hoists

  • Gantry Cranes

  • Goliath Cranes

  • Mobile Cranes

  • Tower Cranes

FG12.5P4 Technical Data Specifications
Body Black Nylon \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

Warranty:

FG12.5P4 “1 years warranty” on the date of Dispatch
Contact us:
Get in touch with us at 91376-20579, info@anandcontrol.in or visit our website www.anandcontrol.in