SICK TR4 Direct

5 Electrical installation
5.1 Notes on cULus
For use according to the requirements of UL 508, the following conditions must also be
me
t:
•
The voltage supply must correspond to class 2 in accordance with UL 508.
•
The ambient temperature must not exceed 40 °C.
5.2 Safety notes for the electrical connection
DANGER
Bo
th safety outputs OSSD 1 and OSSD 2 (semiconductor outputs) must be evaluated
without fail in order to guarantee safety.
An incorrect connection may cause the device to malfunction or become damaged.
P
lease note the following:
b
Do not use a control with clocking or switch off the clocking function of your control
system.
b
The device generates its own clock on output powers OSSD 1/OSSD 2. A down‐
stream controller must tolerate these test pulses, which can have a length of up to
1 ms.
b
The inputs of a connected evaluation device must be positive-switching (PNP)
inputs because the two outputs of the safety switch supply a level of the supply
voltage in the switched-on state.
b
All electrical connections must be isolated from the supply network either through
safety transformers in accordance with IEC/EN 61558-2-6 with output voltage limi‐
tation or through equivalent isolation measures.
b
For use according to the requirements of cULus, a secondary class 2 transformer
according to UL 5085-3 or a class 2 voltage supply according to UL 1310 must be
used. This requirement also applies for inputs In 1 and In 2 as well as outputs
OSSD 1 and OSSD 2 of the safety switch.
b
All electrical outputs must have an adequate suppressor for inductive loads. For
this purpose, the outputs must be protected with a suitable suppressor (e.g. free‐
wheeling diodes, varistors, RC elements).
NOTE
The response time increases depending on the selected suppressor!
b
P
ower devices (e.g. motors) that represent a strong source of interference must be
locally isolated from the input and output current circuits for signal processing.
The cable routing of the safety circuits should be separated from the cables of the
power circuits by the greatest possible distance.
5.3 Failsafety
•
If t
he device does not respond when the supply voltage is connected (e.g. Status/
Diag LED does not flash), the safety switch must be replaced.
•
The supply voltage is reverse polarity protected. The 1 / In 2 and OSSD 1 / OSSD 2
contacts are short-circuit protected.
•
A cross-circuit between OSSD 1 and OSSD 2 is detected by the safety switch. A
cross-circuit in the cable can be ruled out by protected cable routing.
•
A short-circuit between OSSD 1 and OSSD 2 to 24 V DC is detected. A short-circuit
between OSSD 1 and OSSD 2 simultaneously to 24 V DC must be ruled out by pro‐
tected cable routing without fail.
ELECTRICAL INSTALLATION 5
8022968/15V1/2019-11-22 | SICK O P E R A T I N G I N S T R U C T I O N S | TR4 Direct Cylindrical
13
Subject to change without notice