Limit Switches

Lever Type Limit Switch

Body Material:
Powder Coated Aluminium die cast
Degree of Protection:
IP-55 Confirming to IS- 13947 (Part-1)1993
Mounting Position:
Floor
Cable Entries:
2, 3/4" Conduit
No. of Contact:
2/3/4
Contact:
Double break silver cadmium
Wire Connection:
Screw terminal
Rated Voltage Insulation:
500 V.A.C.
Thermal Test Current:
10/40 Amps.
Operation:
720/hour

Switching diagram:



  LS/2SH/2
 
Contact No.
R
O
F
1
X
X
v
2
v
X
X
  LS/1SH/2
 
Contact No.
R
O
F
1
v
X
v
2
v
X
v
  LS/1SH/1
 
Contact No.
R
O
F
1
v
X
v
2
v
v
v

Weight Operated Switch

Body Material:
Powder Coated Aluminium die cast
Degree of Protection:
IP-55 Confirming to IS- 13947 (Part-1)1993
Mounting Position:
Floor
Cable Entries:
2, 3/4" Conduit
No. of Contact:
2/3/4
Contact:
Double break silver cadmium
Wire Connection:
Screw terminal
Rated Voltage Insulation:
500 V.A.C.
Thermal Test Current:
10/40 Amps.
Operation:
720/hour

Switching diagram:

CWLS/1SH/2
 
Contact No.
Normal
Operated
1
X
 
2
X
 
 CWLS/1SH/1
 
Contact No.
Normal
Operated
1
Xv
 

Rotary Geared Limit Switch

Body Material:
Aluminium die cast
Degree of Protection:
IP-55 Confirming to IS- 13947 (Part-1)1993
Gear Ratios:
1:48, 1:60
Drive:
Worm Drive
Cable Entries:
Double break silver cadmium
Rated Voltage Insulation:
500 V.A.C.
Thermal Test Current:
10/40 Amps.
NO. of Contacts:
6 maximum
Cam setting:
adjustable
Contacts:
Normallyopen / Normally close

Introduction

Next, align the brake drum and adjust the nuts on the tie-rod such that both shoes grip the brake drum equally. Energize the power cables, this will cause the thrust rod/ end shield of the thruster to move up and the brake is released as the shoes release the brake drum. Adjust the setting bolts on both arms.

For Uniform wear of brake liners of both shoes, both arms must move equally. The setting screw of the side arm must be sdjusted such that it arrests its movement when the thruster reaches half of its stroke. Next the setting screw of the main arm is to be adjusted, such that the movement of the main arm is adjusted when the thruster reaches its full stroke.

Application:

Rotary geared type limit switches are suitable for use reversing drives such as hoists, winches, rolling mills and various other mechanisms used such used in steel plants such as coke oven, feeding machinery etc.

Construction:

Rotary geared type switch is basically consists of heavy duty worm gear drive. The worm gear unit is built in a cast housing fitted on main bossy of limit switch, the cam shaft which extends from behind the gear into housing, accommodation the cams adjustable actuators which are fitted on the cams. These actuators strikes the contact finger of respective contacts

Worm Drive Switch FG

Body Material:
Black Nylon
Cover Material Yellow:
Impact proof thermoplastic
Protection Degree:
IP-55 Confirming to IS-13947
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.

 

Application

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

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

Mechanical Data:

Ratios
Effective Rotations
Useful Rotations
2 Contacts Model
4 Contacts Model
1:12.5
12
11.6
FG12.5P2
FG12.5P4
1:25
24.5
23.2
FG25P2
FG25P4
1:50
49
46.5
FG50P2
FG504
1:100
98
93
FG100P2
FG1004
1:200
196
185
FG200P2
FG200P4
1:400
392
372
FG400P2
FG400P4

Worm Drive Switch FG

Indroduction

LSR Cross 4way switch operates the control changeover. Contact of motor of moving equipment when operates with load actuates the 30mm Road of limit switch this in turn. Operates the NO/NC change-over contact elements

General Characteristics

Self extinguishing thermoplastic housing VO UL94 
IP 65 protection rating according to IEC/EN 60529 
Ambient temperature operating-25° + 55° C, Storage-30°+70°Material class II, 
Polluton class 3 according to IEC/ En60947 Slow break positive opening double break contacts 
Rated insulation voltageV 690
Rated impulse withstand voltagekV 4
Rated thermal current I thA 10
Frequency Hz50/60

Rated operating current;		10A
Cable entry22.5
 
 

Operation

The contact operate / change-over at 90° rotations. The limit switch has 4 position 0°-90° -180° -170° operations, used for single / two speed motor control. Control switch with 300mm road from 3 to 4 position with 2 or 4 contacts.

Description Tune Diagram
3-position with mechanical interlock LSR 2S A
3-position with mechanical interlock LSR 22S

 B
4-position rotary LSR 4S C
4-position rotary LSR 5S D
4-position rotary LSR 5S1 E
For two-speed motorcontro    
4-position with mechanical interlock LSR 22 D F

Wiring Diagram A LSR 2 S With Mechanical interlock

Wiring Diagram B LSR 2 S With Mechanical interlock

Wiring Diagram C LSR 4 S Without Mechanical interlock

Wiring Diagram D LSR 4 SM Without Mechanical interlock

Wiring Diagram C LSR 4 SM 1 Without Mechanical interlock

Wiring Diagram C LSR 22 D With Mechanical interlock