MSI-SR2, MSI-SR2/F

Function

• Single-channel Emergency Stop wiring with manual start
  If the Emergency Stop button is not pressed, the relays K1 and K2 pick up and lock when the start button is pressed. When the Emergency Stop button is pressed, K1 and K2 go dead and drop out. With single-channel Emergency Stop wiring, Category 2 in accordance with EN 954-1 is attained. Earth faults in the push-button circuit are detected.
  
  
• Two-channel Emergency Stop wiring with manual start
  With two-channel Emergency Stop wiring, Category 4 in accordance with EN 954-1 is attained. Cross circuits between the push-button contacts and earth faults in the push-button circuit are detected.
  
  
• Sliding safety grid monitoring with 2 positively opening position switches
  If the safety door is closed (position switches S1 and S2 closed) the relays K1 and K2 pick up and lock. When the safety grid is opened, the relays K1 and K2 go dead and drop out. The MSI-SR2 remains in this state until the safety grid is closed again.
  
  
• Simultaneity monitoring
  The switches can be monitored for simultaneous closing (within 0.5 s).
  
  
• Safety interface for optoelectronic protective devices, Type 4
  It is possible to connect safety light barriers, Type 4, with either relay outputs or with failsafe semiconductor outputs and integrated cross circuit monitoring (connection diagram, Fig. 7). The MSI-SR2’s regression delay of 20 ms must be taken into account when calculating the safety distance.
  
  
• Cross circuit monitoring
  In case of a cross circuit or short circuit, the output relays K1 and K2 are switched off. The MSI-SR2 can resume operation approx. 2 s after the cause of the problem has been eliminated.
  
  
• Start button monitoring during manual start
  The start button function is monitored for signal changes. The release occurs when the button is let go (1/0 signal change). This function is deactivated during automatic start.
  
  
• Contact multiplication
  So that the function of the external relays can be monitored, the normal closed contacts of these relays are serially connected into the start circuit S33-S34.