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4
Electrical Connection
4.1
Installation Regulations
The general safety precautions in Chapter 2 must be
observed. The electrical installation may be performed
only if there is no voltage applied, and it must be
performed by trained specialists.
In the /R versions, it is possible that high voltages may be
present at the output contacts. A no-voltage state is
achieved only when the 24 V DC supply voltage as well
as the supply lines to the switch contacts are safely
4.2
Power Supply Requirements
The supply voltage of 24 V DC must guarantee safe
mains separation and be able to bridge an interruption in
voltage of 20 ms at full load.The functional earth connec-
tion of the MSI is established when snapped onto the
grounded metal mounting rail via the rear clamp fixture.
4.3
Connecting AOPDs, Type 4 or Type 2
The examples below show possibilities for connecting
and combining AOPDs of various safety categories and
with various output features (relays, safety-oriented tran-
sistor outputs, cross circuit monitoring within and outside
the AOPD).
AOPDs Type 4 with transistor outputs and cross connec-
tion monitoring function can directly connected to the
safety inputs S1and S2. See Example 1.
switched off and secured against being switched on
again.
Coded plug-in terminal blocks allow a connection cross-
section of up to 2.5 mm
externally fused against excess current with a fuse of
2.5 AmT. The switch contacts must also be externally
fused against excess current with a maximum of 4A gG.
This prevents the safety-related contacts from welding
together if the current load is too high!
The lead for the supply voltage must be externally fused
against excess current with a maximum of 2.5 AmT.
AOPDs Type 4 with relay outputs, safety switches or
emergency stop buttons must be connected so that the
odd-numbered test signal T1 are directed via the non-
delaying contacts to an odd-numbered safety input
(T1=>S1) and vice versa (T2=>S2). See Example 2.
AOPDs Type 2 are periodically tested using the time-
displaced test signals T1 or T2. The odd-numbered test
signal must be directed to an even-numbered safety
input by the way of the time-delaying AOPD (T1=>S2)
MSI-s
2
. The supply voltage must be
21
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