Introduction

Counter Weight Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500 v.a.c. and 40 Amps. continuous current.

Lever Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500 V and 40 Amps. continuous current. The limit switch normally remains closed and cuts off power to stop the motor of the crane. The Lever limit switch operates when it reaches a predetermined position when the lever is moved over a projecting member fixed on the girder.

Introduction

Master controllers are used for operation of contractors equipment controlling E.O.T. Cranes & Rolling mills drives. The controllers are made in dust proof enclosure in IP-54 degree of protection, up to 6 notches either side with maximum 24 contacts as per desired sequence with spring return arrangement & deadman's handle arrangement are available. Master Controllers are compact up to 4-0-4 step suitable for Grab-Hoist, CT-LT maximum contacts 16 per motion with spring return arrangement.

Assembly and Function

Master controllers are of cam type where in contacts are actuated by individual cams mounted on operated shaft. Master controller is housed in enclosure and provided with an easily removable cover with ample area for maintenance. The cam shaft is mounted on bearing bushes on walls of housing. The cams are made of derlin material and fixed on square.

• Wide electrical clearance
• Long life
• Simple in operation
• Easy in installation

Introduction

ROLEX make resistance boxes are designed to meet requirements of A.C & D.C. application for E.O.T. Cranes, Winches, Rubber Mills, Flour Mills, Coal Mines, Cement Mills, Power Plants, Conveyors, Coke Oven, Blowers etc. for Speed control and developing Starting Torque.

Assembly and Function

Rolex punched Steel resistance boxes Consist of Grids Punched from Nickel Chromium Steel Alloy Sheet. These grids are shock and vibration proof. These resistors are specially suited for Steel mill duty. Coal mines etc. These resistors are available in a wide range of Current ratings from 7 Amps to 800 Amps continuous. The series connection between adjacent grids is by means of copper jumpers. The resistors, after overloads of moderate duration become red hot but no damage is caused and retains their shape after overload disappears.

• Economical
• Less Weight
• Spares Easily Available
• Easy For Maintenance
• Special Anti-vibration method adopted

Introduction

Brakes are applied on brake drum. The shoes of the brakes are applied on brake drum in normal condition. When the motion is to be obtained the brake shoe are released and the brake drum is free to rotate.

Introduction

Geared couplings are used to connect two different shafts or offset shafts. Geared couplings are made of EN material to absorb shocks. Geared coupling consists of gear which transmit the motion smoothly by absorbing shocks.

Introduction

(MODEL NO.RI-1121):A Grab Differential limit Switch is Driven by holding and closing winches used in Auxiliary circuit for single lever grabs control. It is used to stop or start the function of the motor at required preset position, irrespective of the height of the grab. It works at the highest & lowest grab position. A key is provided with the switch to release the locking nut to Adjust the cam disc.

Introduction

Very compact and modern in design. Foundation is not necessary as they are directly mounted on non-driving end shaft of the motor. It consist of Liner Plates (Brake Disc) with square hole ate the centre. One corresponding piece of square hub is supplied with the Brake. This hub is keyed to the motor shaft and the Liner Plate is free on this hub. Normally Liner Plate is gripped between two discs with the help of Spring Pressure. They work on 230 / 415 V.A.C. When the current is supplied to the brake one disc is attracted by electromagnet against spring pressure and Liner Plate is released. Thus the Brake is 'off'. Once the Brake is set it does not require adjustment or maintenance. When the liner plate wears with the use then only air gap is required to be maintained periodically. An arrangement to release the brake manually could be provided on request

Introduction

Clutch is used to transmit the power only & Brake is used to stop machine only. When starting & stopping both are to be controlled, Clutch and Brake both are to be controlled; Clutch and Brake both are required. Clutch will engage drive to machine and when brake is applied clutch will only disconnect drive from machine and brake will stop machine only. The drive will keep rotating. This is ideal for inching operation.

These are in two parts: 1) Magnet Body & 2) Armature Plate. These Clutches / Brakes engage when current is supplied to them. Slip rings are fitted to clutch only. The liner wear can be adjusted and wearing parts are replaceable. A sprocket, gear or pulley can be mounted if desired.

Rotary geared limit switch is used to trip motor supply when the moving loads reach the extreme end positions of working zone. Rotary geared limit switches are suitable for use on reversing drives such as Hoists, winches, rolling mills and various other mechanisms used in steel plants such as coke oven, feeding machinery etc.

Introduction

Lever Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500 V and 40 Amps. continuous current. The limit switch normally remains closed and cuts off power to stop the motor of the crane. The Lever limit switch operates when it reaches a predetermined position when the lever is moved over a projecting member fixed on the girder.

The series limit switch is fitted with four sets of contacts which cuts off two phases of the motor in either direction and is suitable for 500 V supply system. The limit switch contacts are automatically reset when the lever returns to zero position due to spring action. The base and cover have machined surface to protect against dirt and dust.

Introduction

Counter Weight Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500 v.a.c. and 40 Amps. continuous current.

Lever Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500 V and 40 Amps. continuous current. The limit switch normally remains closed and cuts off power to stop the motor of the crane. The Lever limit switch operates when it reaches a predetermined position when the lever is moved over a projecting member fixed on the girder.

Introduction

Master controllers are used for operation of contractors equipment controlling E.O.T. Cranes & Rolling mills drives. The controllers are made in dust proof enclosure in IP-54 degree of protection, up to 6 notches either side with maximum 24 contacts as per desired sequence with spring return arrangement & deadman's handle arrangement are available. Master Controllers are compact up to 4-0-4 step suitable for Grab-Hoist, CT-LT maximum contacts 16 per motion with spring return arrangement.

Assembly and Function

Master controllers are of cam type where in contacts are actuated by individual cams mounted on operated shaft. Master controller is housed in enclosure and provided with an easily removable cover with ample area for maintenance. The cam shaft is mounted on bearing bushes on walls of housing. The cams are made of derlin material and fixed on square.

• Wide electrical clearance
• Long life
• Simple in operation
• Easy in installation

Introduction

ROLEX make resistance boxes are designed to meet requirements of A.C & D.C. application for E.O.T. Cranes, Winches, Rubber Mills, Flour Mills, Coal Mines, Cement Mills, Power Plants, Conveyors, Coke Oven, Blowers etc. for Speed control and developing Starting Torque.

Assembly and Function

Rolex punched Steel resistance boxes Consist of Grids Punched from Nickel Chromium Steel Alloy Sheet. These grids are shock and vibration proof. These resistors are specially suited for Steel mill duty. Coal mines etc. These resistors are available in a wide range of Current ratings from 7 Amps to 800 Amps continuous. The series connection between adjacent grids is by means of copper jumpers. The resistors, after overloads of moderate duration become red hot but no damage is caused and retains their shape after overload disappears.

• Economical
• Less Weight
• Spares Easily Available
• Easy For Maintenance
• Special Anti-vibration method adopted

Introduction

Brakes are applied on brake drum. The shoes of the brakes are applied on brake drum in normal condition. When the motion is to be obtained the brake shoe are released and the brake drum is free to rotate.

Introduction

Geared couplings are used to connect two different shafts or offset shafts. Geared couplings are made of EN material to absorb shocks. Geared coupling consists of gear which transmit the motion smoothly by absorbing shocks.

Introduction

(MODEL NO.RI-1121):A Grab Differential limit Switch is Driven by holding and closing winches used in Auxiliary circuit for single lever grabs control. It is used to stop or start the function of the motor at required preset position, irrespective of the height of the grab. It works at the highest & lowest grab position. A key is provided with the switch to release the locking nut to Adjust the cam disc.

Introduction

Very compact and modern in design. Foundation is not necessary as they are directly mounted on non-driving end shaft of the motor. It consist of Liner Plates (Brake Disc) with square hole ate the centre. One corresponding piece of square hub is supplied with the Brake. This hub is keyed to the motor shaft and the Liner Plate is free on this hub. Normally Liner Plate is gripped between two discs with the help of Spring Pressure. They work on 230 / 415 V.A.C. When the current is supplied to the brake one disc is attracted by electromagnet against spring pressure and Liner Plate is released. Thus the Brake is 'off'. Once the Brake is set it does not require adjustment or maintenance. When the liner plate wears with the use then only air gap is required to be maintained periodically. An arrangement to release the brake manually could be provided on request

Introduction

Clutch is used to transmit the power only & Brake is used to stop machine only. When starting & stopping both are to be controlled, Clutch and Brake both are to be controlled; Clutch and Brake both are required. Clutch will engage drive to machine and when brake is applied clutch will only disconnect drive from machine and brake will stop machine only. The drive will keep rotating. This is ideal for inching operation.

These are in two parts: 1) Magnet Body & 2) Armature Plate. These Clutches / Brakes engage when current is supplied to them. Slip rings are fitted to clutch only. The liner wear can be adjusted and wearing parts are replaceable. A sprocket, gear or pulley can be mounted if desired.

Rotary geared limit switch is used to trip motor supply when the moving loads reach the extreme end positions of working zone. Rotary geared limit switches are suitable for use on reversing drives such as Hoists, winches, rolling mills and various other mechanisms used in steel plants such as coke oven, feeding machinery etc.

Introduction

Lever Limit Switches are used for Heavy duty E.O.T. Cranes, Hoists to prevent over travel of hoisting motion on power and control circuit up to 500 V and 40 Amps. continuous current. The limit switch normally remains closed and cuts off power to stop the motor of the crane. The Lever limit switch operates when it reaches a predetermined position when the lever is moved over a projecting member fixed on the girder.

The series limit switch is fitted with four sets of contacts which cuts off two phases of the motor in either direction and is suitable for 500 V supply system. The limit switch contacts are automatically reset when the lever returns to zero position due to spring action. The base and cover have machined surface to protect against dirt and dust.