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General wiring recommendations
Bad wiring on power supply terminals
Attention: The product should be installed by trained people who have the knowledge of wiring
electronic devices. In case of bad wiring, although the modules are protected against various errors
(reverse polarity, short circuit, etc.), some problems could always happen:
- On the CPU Terminal Base, the terminals L+ and M are doubled. If the power supply is badly
connected, a short circuit could happen and lead to a destruction of the power supply or its fuse. If no
suitable fuse exists, the Terminal Base itself could be destroyed.
- The CPUs (Terminal Bases) and all electronic modules (and Terminal Units) are protected against
reverse polarity.
- All necessary measures should be carried out to avoid damages to modules and wiring. Notice the
wiring plans and connection examples.
Bad wiring on I/O terminals
Attention: All I/O channels (digital and analog) are protected against reverse polarity, reverse
supply, short circuit and continuous overvoltage up to 30 V DC.
Behaviour of the system in case of power supply interruptions and
power recovering
AC500 system supply (terminals L+, M)
As soon as the CPU power supply is higher than 19.2 V DC, the power supply detection is activated and
the CPU is started. When during operation the power supply is going down to lower than 19.2 V DC for
more than 10 ms, the CPU is switched to safety mode (see System Technology of the CPUs).
A warm restart of the CPU only occurs by switching the power supply off and on again (see also the
description of the function modes of the CPU in the "AC500 System Technology" chapters.
S500 system supply (is provided through the FBP plug)
AC500 or S500 process power supply (terminals UP and ZP)
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V2
AC500 Hardware
1-31
System data
AC500 / Issued: 05.2007
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