General; Proper Use; Device Overview; Signal Indicators - ASO Safety Solutions SK 31 Manuel D'utilisation

3. General

The SK 31 switching unit, designed with one channel, is used for evaluating safety contact mats
and for safeguarding locations where there is a risk of crushing and cutting through the use of safety
contact edges and safety bumpers (sensors).
The SK 31 switching unit is intended for use on plants/machines that make a test signal available
through a primary controller prior to each dangerous movement. In combination with the test signal, the
switching unit satisfies safety category 2 acc. to EN ISO 18349-1:2008 "Safety-related parts of control
systems".
Monitoring of the standby current is made possible by an integrated terminating resistor in the sensor.
If the specified standby current is flowing, the output relay is activated and the switching contact is
closed. If the sensor is actuated or the sensor circuit is interrupted, the relay switching contact opens.
The monitoring state of the sensor and the applied operating voltage are indicated by LEDs.

4. Proper use

The SK 31 switching unit can only fulfil its safety-related task if used properly.
Proper use of the switching unit is the use as protection in combination with safety contact mats,
safety bumpers and safety contact edges.
Any uses above and beyond these uses constitute improper use. The manufacturer assumes no
liability for damages arising from improper use.
The device may only be used in special applications with the manufacturer's express consent.

5. Device overview

5.1 Signal indicators

LED Power green
Supply voltage
LED Actuate yellow
Sensor actuated
LED Fault red
Safety circuit interrupted

5.2 Connection terminals

Supply voltage 230 V 50/60 Hz
PE, L1, N
12-24 V AC/DC Supply voltage 12-24 V AC/DC
X1 X2 Sensor connection
Out 13 14 Safety relay
Out 12 13 14 Safety relay (version SK 31-31W)
Test signal input
Test Signal
Power
Actuate
Fault
S1
12 13 14 Test X1 X2
OUT Signal IN
Test Signal
S1 B
S1
A
12-24 V PE L1 N
AC/DC
15