Installation
4-31
48XX/49XXSHB0399
Signal cables
( Always screen digital and analog signal cables.
- Always connect the signal cables over the shortest possible distance with
the screen connections provided at the controller:
- Connect both screen ends of digital signal cables.
( If potential differences are to be expected, lay an additional compensation
cable.
( For long signal cables, provide additional screening points:
- Connect the screen at the control cabinet input with a suitable clamp to
the conductive mounting plate of the control cabinet.
Remove the coating
Contact the screen
withasurfaceaslargeaspossible
Screen braid
K35.0098
FIG 4-22 Additional screening connection on a mounting plate of the control cabinet
Filters
( Only use the mains filters and RFI filters which are designated for the
controller:
- RFI filters reduce impermissible high-frequency interference to a
permissible value.
- Mains chokes reduce low-frequency interference which depend on the
motor cable and its length.
Screening
Wire the screening and the GND and PE connections very carefully, to avoid
interference.
( All signal cables should be screened.
( Avoid a common terminal board for mains input and motor output.
( Route cable as close as possible to the reference potential. Free-hanging
cables have the same effect as aerials.
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