Connection plans and user software must be created so that all technical safety aspects, legal
regulations and standards are observed. In practice, possible shortcircuits and breakages must
not be able to lead to dangerous situations. The extent of resulting errors must be kept to a min-
imum.
Do not operate devices outside of the specified, technical data!
Trouble-free functioning cannot be guaranteed outside of the specified data.
NOTICE!
PLC damage due to missing earthing
– Ensure to earth the devices.
– The earthing (switch cabinet earthing, PE) is supplied both by the mains
connection (or 24 V supply voltage) and via DIN rail. The DIN rail must be
connected to the earth before the device is subjected to any power. The
earthing may be removed only if it is certain that no more power is being
supplied to the control system.
In the description for the devices (operating manual or AC500 system description), reference is
made at several points to earthing, electrical isolation and EMC measures. One of the EMC
measures consists of discharging interference voltages into the earthing via Y-type capacitors.
Capacitor discharge currents must basically be able to flow off to the earthing (in this respect,
see also VBG 4 and the relevant VDE regulations).
CAUTION!
Do not obstruct the ventilation for cooling!
The ventilation slots on the upper and lower side of the devices must not be
covered.
CAUTION!
Run signal and power wiring separately!
Signal and supply lines (power cables) must be laid out so that no malfunctions
due to capacitive and inductive interference can occur (EMC).
WARNING!
Labels on or inside the device alert people that dangerous voltage may be
present or that surfaces may have dangerous temperatures.
WARNING!
Splaying of strands can cause hazards!
During wiring of terminals with stranded conductors, splaying of strands shall be
avoided.
– Ferrules can be used to prevent splaying.
2021/06/29 3ADR010635, 2, en_US 11
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