Operating Instructions Chapter 5
TR4
8014467/YTD7/2016-03-30 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 71
Subject to change without notice
Electrical installation
en
5 Electrical installation
5.1 Safety notes for the electrical connection
To ensure safety it is imperative both safety outputs (semiconductor
outputs) Out A Out B are evaluated!
Incorrect connection can result in malfunctions or damage to the
device. Please observe the following notes:
• Do not use a controller with PSDI mode or disable the PSDI mode on
your controller.
• The device generates its own PSDI signal on the output cables
Out A/Out B. A downstream controller must tolerate this test signal
that could have a duration of up to 1ms.
• The inputs on an evaluation device connected must be positive
switching (PNP), as the two outputs on the safety switch provide a
level at the supply voltage when switched on.
• All electrical connections must be isolated from the line supply either
by means of safety transformers as per IEC/EN 61 558-2-6 with
limiting of the output voltage in case of faults, or by means of
equivalent isolation measures.
• For use in accordance with cULus requirements, the TR4 should be
supplied from the secondary of a UL 5085-3 Class 2 transformer or
UL 1310 Class 2 power supply. This requirement also applies to the
inputs In A and In B and outputs Out A and Out B on the TR4 safety
switch.
• All electrical outputs must have an adequate suppressor in case of
inductive loads. For this purpose the outputs must be protected using
a suitable suppressor (e.g. freewheeling diodes, varistors and RC
elements).
The response time will increase depending on the suppressor
selected!
• Equipment (e.g. motors) that is a powerful source of interference
must be physically separated from the input and output circuits for
the signal processing. The safety circuits should be laid as far as
possible from the cables for the power circuits.
WARNING
WARNING
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