SLCT* and SLCT*/35 safety light curtains
Installation
2
7
1
6
9
5
2
0
1
7
-1
2
25
After the supply voltage is switched on, the transmitter or receiver unit selects
mode A or mode B, depending on the applied voltage.
If the level at the input changes during operation, this is identified as a fault and
the system switches to safe mode.
4.4.3
Signal inputs on the receiver unit
Connect the restart (RI) and relay monitor inputs to the receiver unit with NC
contacts that switch 24 VDC. The function is triggered if the external control
contact is open for a defined period.
Restart (RI), startup/restart interlock input
The startup/restart interlock prevents the OSSDs from switching to ON after the
protection field is cleared or after the supply voltage is turned on when the
protection field is free. The safety function is only activated once the startup
enable button has been pressed.
An NC contact that switches the supply voltage must be connected to the input to
activate the safety function. If the start/restart interlock should be deactivated, the
input must be bridged with the status/select output. An open input also activates
the startup/restart interlock.
The input signal time is monitored and the actuation time should be active for
between 0.2 s to 1.2 s.
Note!
Make sure that the transmitter unit and receiver unit are operating in the same
mode.
Note!
In the case of a fault, the fault can be reset by pressing and holding the startup
enable button for between 1.2 s and 2.4 s.
Danger!
Danger to life due to incorrectly positioned startup enable
If you install the button for the startup enable within the hazardous area or in a
position from which the hazardous area is not visible, this may result in the button
being pressed although personnel or objects are still located within the hazardous
area.
■
Mount the startup enable button in front of the hazardous area as follows:
• It must not be possible to activate the startup enable from within the
hazardous area, or to trigger a function that would mean the
protection field is interrupted by pressing the button.
• The hazardous area must be clearly visible from the location in
which the button is pressed.