S5-115F Manual Installation Guidelines
Grounding
• You should ground load circuits where possible . Provide a removable connection to the
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
2
cross section to
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 > 60 V DC
• If circuits are operated with voltages > 25 V AC.
• The mounting racks of the S5-115F must be connected to the protective conductor. This
grounds the reference potential of the controller.
Nongrounded operation of S5-115F 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.
(rating: C = 1µF, R = 100 k ).
EWA 4NEB 811 6148-02
3-35
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