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Installation Guidelines
Load power supply
•
For 24 V DC load circuits, you require a load power supply unit with safe electrical isolation.
•
You require a back-up capacitor
power supply units. Connect the capacitor in parallel to the output terminals of the load
power supply.
•
For controllers with more than five electromagnetic operating coils, galvanic isolation by a
transformer is required by DIN VDE 0113, Part 1; it is recommended by DIN VDE 0100, Part 725
.
•
For nonfloating input and output modules, connect terminal M of the load power supply unit
with the PE ground conductor of the control circuit's PS 951 power supply module.
Grounding
•
You should ground load circuits where possible
protective conductor on the load power supply unit (terminal L or M) or at the isolating
transformer in secondary circuit.
•
To protect against stray noise, use copper conductors of at least 10 mm
ground the mounting racks by the shortest possible route.
Warning
!
You must provide insulation monitoring devices for nongrounded power supply
modules
•
If hazardous plant conditions could arise from double-line-to-ground faults or
double fault to frame faults.
•
If no safe (electrical) isolation is provided.
•
If circuits are operated with voltages > 120 V DC.
•
If circuits are operated with voltages > 50 V AC.
•
The mounting racks of the S5-115U must be connected to the protective conductor. This
grounds the reference potential of the controller.
Nongrounded operation of S5-115U controllers is only permissible if all the circuits are
operated with functional extra-low voltage. In this case, connect the mounting rack or DIN rail
over an RC network with the protective conductor.
3-36
(rating: 200µF per 1 A load current) for nonstabilized load
. Provide a removable connection to the
S5-115U Manual
2
cross section to
EWA 4NEB 811 6130-02b
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