Switches with Interlock

Machines that continue running after being switched off are often part of automated production processes. Safety guards prevent operator access and must therefore be kept closed until the hazards posed by machine movement have ceased. Safety position switches with interlock function ensure that safety gates, safety doors and other protective guards remain closed for as long as a hazardous situation exists.

In production processes safety position switches have three main tasks:
 

• Enabling the machine/process when the safety guard is closed and interlocked
• Disabling the machine/process when the safety guard is opened
• Position monitoring of the safety guard and interlock

The SLK/SLM safety position switches with separate actuators and interlock enable the user to realise locking systems conforming to EN 1088, EN ISO 12100-1, 12100-2 and since 29.12.2009 to the compulsory Machinery Directive 2006/42/EC.

Plastic-bodied, with interlocking, Type SLK

• IP 67
• Rotary actuating head (4x 90°) as well as horizontal and vertical actuation ensure complete flexibility in use
• Compact design with short overall size of only 170 mm
• Innovative installation with spring-loaded terminals
• Cable entry 3 x M20 x 1.5
• Two independent safety circuits ensure reliable integration
  • With two contacts, circuit 1 monitors the actuator
  • With two contacts, circuit 2 monitors the interlock
• Two different operating voltages for universal integration:
  • 24 V AC / DC or 110 V / 230 V AC
• Function conforming to GS ET 19,
  EN 60 204-1, EN 60 947-1 and
  EN 60 947-5-1
• Anti-tamper facility due to coding
• AS-Interface variants available
• Preassembled with customer-specific
  cables and connectors on request

Metal-bodied, interlocking, type SLM

• IP 67
• Highly resistant in harsh industrial environments and with compact enclosure for space-saving installation
• Triple-coded actuator with high anti-tamper security l Approach direction of actuator easily changed in 90° steps (repositioning only possible with actuator inserted)
• Integrated protective circuit avoids polarity reversal and voltage peaks
• Entire function unit encapsulated on the inside
• Separate connection compartment for safe wiring at contact strip
• Two independent safety circuits ensure reliable integration
  • With two contacts, circuit 1 monitors the actuator
  • With two contacts, circuit 2 monitors the interlock
• Two different operating voltages for universal integration:
  • 24 V DC or 230 V AC
• Anti-tamper facility due to coding
• Function conforming to GS ET 19,
  EN 60 204-1, EN 60 947-1 and
  EN 60 947-5-1
• Preassembled with customer-specific
  cables and connectors on request

Actuators for SLK, SLM, ENK VTU

Standard actuator A1

Actuators for standard applications with a minimum actuating radius of 400 mm
 

Hinged Actuator A2

Actuators for applications with a minimum actuating radius of 150 mm. Repositioning of spring-mounted actuator by 4 x 90° in not mounted state possible.

Hinged Actuator A3 with dust cap

Actuators for applications where the minimum actuating radius is at least 400 mm and where the actuator hole must be protected from fine dust.

Repositioning of spring-mounted actuator by 4 x 90° in not mounted state possible.

Flexible actuator A4

Actuators for applications with a minimum actuating radius of 350 mm.

Repositioning of spring-mounted actuator by 4 x 90° in not mounted state possible.
 

Transverse actuator A7

Actuator with mounting flange for standard 
applications with a minimum actuating radius 
of 400 mm.

The new generation of safe mechanical guard locking switches

Mechanically highly stressed components – such as the rotating head – are made of metal. This makes it extremely robust and durable. The plastic housing, on the other hand, is light and functional.
A variant with M12 plug connector allows a particularly simple connection to the machine. Another user-friendly feature is the possibility of flexible contact assembly: The contact combination of NC and NO for monitoring the door position and the guard locking can be freely combined at the factory.

• Lightweight yet robust: Hybrid of metal and plastic
• Flexible contact assembly
• Integrated manual release
• Symmetrical design
• Five actuating positions
• Rotatable head (4×90°)
• Fail-safe guard locking system
• Optional emergency exit
• Optional emergency release
• M12 connector as an option

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