
Engineering
26
06/99 AWB 2700-1364 GB
Power supply
The following page shows the circuit diagram for a
possible power supply.
Main switch
Circuit-breaker for power supply units
Control transformer
(to EN 60 204 part 1 required)
Miniature circuit-breaker
Where power supplies or control circuits are
ungrounded, an insulation monitoring device must be
used (EN 60 204 part 1 and VDE 0100 part 725).
Screen grounding of signal cables (see also Page 19)
External protection of relay contacts, such as 6 A
circuit- breaker, e.g. FAZN B16 (100% protection
against short circuit and overload).
Warning: if a 10 A circuit-breaker is used, there is no
overload protection in the event of failure. This is
because the plug-in screw terminal will accept a
maximum load of 12 A, but the circuit-breaker can bear
a maximum of 1.45 times the rated current (14.5 A)
before it disconnects.
240 V AC relay outputs must be connected to the same
phase (e.g. L1); potential difference max. 250 V AC.
Connect the top-hat rail to PE, connect the top-hat rail
to the mounting plate ensuring a low impedance joint
Maintain a spacing of at least 30 cm (12 ”)
between analog cables and 120/240 V AC
cables.
Make sure the supply to analog actuators and
encoders is electrically isolated. If electrical
isolation is insufficient, the manufacturers of
analog encoders and actuators offer appropriate
filters.
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