Use the SI-LM40xxx Series Safety Limit (Position) Switches to monitor the position of a guard to detect the movement, opening, or removal. A "guard" can be a gate, door, cover, panel, barrier or other physical means that separates an individual from a hazard. Safety switches will issue a signal to the machine control system to prevent or stop (halt) hazardous situations when the guard is not in the proper position. These Safety switches are designed for non-locking guarding applications, unless another means of locking is provided.
The SI-LM40xxx Series Safety Limit (Position) Switches are considered a Type 1 interlocking device per ISO 14119 that are mechanically actuated by an uncoded rotary or linear actuator (cam or "dog") typically mounted on or part of the guard. A variety of actuating systems are available: plunger (dome), roller plunger, spindle-mount lever roller, and lever.
A pass-through hazard is associated with applications where personnel may pass through a safeguard (which issues a stop command to remove the hazard), and then continues into the guarded area, such as in perimeter guarding. Subsequently, their presence is no longer detected, and the related danger becomes the unexpected start or restart of the machine while personnel are within the guarded area.
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- Limit-switch style (EN 50041 and Type 1 per ISO 14119) where actuating elements are integrated with the enclosure
- Positive opening safety contacts (IEC 60947-5-1) (not dependent on springs)
- Can be used for safety or non-safety interlocking and position monitoring
- Choice of actuating systems: plunger, roller, spindle-mount lever, and lever styles
- Actuator head rotatable in 90° increments
- IP65 aluminum switch housing and cover
- Protected Earth Terminal (IEC 60947-1) on all models
- When properly interfaced or used with an appropriate controller, two switches monitoring an individual guard can achieve safety category 4, per ISO 13849-1 (EN 954-1)
- Typical applications include monitoring sliding (laterally) gates and guards on machines and in safety fencing systems
All mounting hardware is supplied by the user. Fasteners must be of sufficient strength to guard against breakage. Use of permanent fasteners or locking hardware is recommended to prevent the loosening or displacement of the actuator and the switch body. The mounting holes in the switch body accept M5 screws.
Safety limit switches and their actuators (cams, dogs, etc.) must be mounted such that the position cannot be changed after installation/adjustment. Mount the switch securely on a solid, stationary surface that can accommodate the forces of actuator movement. The loosening of mounting hardware must be prevented (for example, lock washers, thread-locking compound). The use of slots should only be used for initial positioning. Pins, dowels, and splines can be used to prevent movement of the switch and the actuator (cam).
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Suitable Optical Fiber Modules are simply inserted after the encoder and before the controller, to convert the electrical signals into reliable optical signals and to convert these back into electrical signals at their destination. An optical fiber line is then routed between these two modules; it is also possible to use an already existing optical fiber wiring. Only a glass fiber is necessary to transmit SSI protocols with up to 99 bits.
The Large Aperture Current Transducers of DT series combine a Hall effect sensor and signal conditioner into a single package for use in DC current applications up to 1200A. DT Series transducers work in the same environment as motors, contactors, heaters, pull-boxes, and other electrical enclosures. They are designed to fit the common DIN rail spacings, but can be mounted in any position.