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SK 34 Safety Relay
3. General
The SK
34 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).
Two separate sensor circuits can be connected to the SK 34 switching unit, whereby both act on one switching
output.
The SK 34 switching unit is intended for use on plants/machines that make a test signal available through a
primary controller prior to each dangerous movement and appropriately evaluate the result. In combination
with this, the switching unit satisfies safety category 2 acc. to EN ISO 13849-1:2008
"Safety-related parts of
control systems"
.
Monitoring of the standby current is made possible by an integrated terminating resistor in the sensor
circuit. If the specified standby current is flowing, the output relay is activated and the switching contact
is closed. If a sensor is actuated or a sensor circuit is interrupted, the relay switching contact opens. The
monitoring state of the sensors and the applied operating voltage are indicated by LEDs.
4. Proper use
The SK 34 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 or 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.
The auxiliary relay contact must not perform any safety functions!
5. Mechanical mounting
The compact and easy-to-install switching unit is to be professionally mounted on a 35 mm DIN-mounting rail
in a dust- and moisture-protected switching cabinet or housing with a protection class of at least IP54.
The switching unit may be mounted in any orientation.
Do not install the switching unit in the immediate vicinity of strong sources of heat.
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