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Cross travel limit switch for Hazardous area
Flameproof position limit switch.
Rugged and reliable, Limitex is designed to control the movement of overhead travelling cranes, hoists and complex machine tools operating in potentially explosive areas.
Overview
MAIN FEATURES
1. Positive opening NC contacts for safety functions.
2. Mechanical life of switches: 1 million operations.
3. Operation frequency: 3600 operations/hour max.
4. Protection degree: IP66.
5. Ambient temperature range: -40°C to +60°C.
6. It features rugged external enclosure made of G20 cast iron and cross rod support made of zinc alloy. Internal components are made of materials which guarantee long mechanical life and continuous performance.
7. Full Body Stainless Steel Version Available.
GENERAL SAFETY SPECIFICATIONS
GENERAL TECHNICAL SPECIFICATIONS
OPTIONS
1. 2 or 4 snap action switches with 1NO+1NC change-over contacts.
2. Cross rods move to 3 or 4 maintained positions, with movement every 90°.
3. Modular adapter with fixing points.
LIMITEX WITH 2 CONTACTS
MAXIMUM ACTUATING DIMENSION
T-type rod - Cross rod with 3 maintained positions
1. Pre-travel angle for rotation contact operation: 70°-49°
2. Maximum rotation angle for each maintained position: 90°
3. Average angle for the mechanical tripping: 48°
Rod - Rod and Roller
1. Pre-travel angle for rotation contact operation: 24°
2. Maximum rotation angle: 65°
Rod - Rod and Roller
1. Pre-travel angle for rotation contact operation: 49°
2. Maximum rotation angle for each maintained position: 90°
3. Average angle for the mechanical tripping: 48°
4. Maintained positions each: 90°
In order to ensure proper operations, the dimensions shall not be increased; anyhow, they can be decreased, taking into account that the closer the impact point is to the center of the head, the higher the impact and the mechanical wear of rod and shaft are.
IMPORTANT: the maximum impact speed is 1.35 m/s, refering to the ideal impact points showed in the drawing
OVERALL DIMENSIONS (mm)
1. Positive opening NC contacts for safety functions.
2. Mechanical life of switches: 1 million operations.
3. Operation frequency: 3600 operations/hour max.
4. Protection degree: IP66.
5. Ambient temperature range: -40°C to +60°C.
6. It features rugged external enclosure made of G20 cast iron and cross rod support made of zinc alloy. Internal components are made of materials which guarantee long mechanical life and continuous performance.
7. Full Body Stainless Steel Version Available.
GENERAL SAFETY SPECIFICATIONS
| Maximum power supply | 250 Vac |
| Maximum current intensity | 3 A |
| Maximum dissipated power | 2 Watt |
| Rated frequency | 50 / 60 Hz |
GENERAL TECHNICAL SPECIFICATIONS
| Operation frequency | 3600 operations/hour max |
| Cable entry |
Nr. 1 M20x1,5 - Nr. 1 M25x1,5 - Nr. 1 ½ NPT (cable glands not supplied) |
OPTIONS
1. 2 or 4 snap action switches with 1NO+1NC change-over contacts.
2. Cross rods move to 3 or 4 maintained positions, with movement every 90°.
3. Modular adapter with fixing points.
LIMITEX WITH 2 CONTACTS
| Utilisation category | AC 15 |
| Rated operational current | 3 A |
| Rated operational voltage | 250 Vac |
| Rated thermal current | 10 A |
| Rated insulation voltage | 300 Vac |
| Mechanical life | 1x106 operations |
| Connections | Screw-type terminals |
| Wires | 1x2.5 mm2 , 2x1.5 mm2 (UL - (c)UL: use 60°C or 75°C copper (CU) conductor and wire 16-18 AWG) |
| Tightening torque | 0.8 Nm |
| Microswitch type |
1 NO+1NC (All NC contacts are of the positive opening operation type  )
|
| Contacts | 4 Microswitches 1NO+1NC |
| Scheme |
|
| Weight ( Kg ) | 4,5 |
MAXIMUM ACTUATING DIMENSION
T-type rod - Cross rod with 3 maintained positions
1. Pre-travel angle for rotation contact operation: 70°-49°
2. Maximum rotation angle for each maintained position: 90°
3. Average angle for the mechanical tripping: 48°
Rod - Rod and Roller
1. Pre-travel angle for rotation contact operation: 24°
2. Maximum rotation angle: 65°
Rod - Rod and Roller
1. Pre-travel angle for rotation contact operation: 49°
2. Maximum rotation angle for each maintained position: 90°
3. Average angle for the mechanical tripping: 48°
4. Maintained positions each: 90°
In order to ensure proper operations, the dimensions shall not be increased; anyhow, they can be decreased, taking into account that the closer the impact point is to the center of the head, the higher the impact and the mechanical wear of rod and shaft are.
IMPORTANT: the maximum impact speed is 1.35 m/s, refering to the ideal impact points showed in the drawing
OVERALL DIMENSIONS (mm)
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