Division into Areas (zones)
Exemplary arrangements in the control cabinet: See fig. 11-3 "Control cabinet
mounting according to interference areas – exemplary arrangements" on page
153.
We distinguish three areas:
1. Interference-free area of control cabinet (area A):
This includes:
● Supply feeder, input terminals, fuse, main switch, mains side of mains
filter for drives and corresponding connecting lines;
● Control voltage or auxiliary voltage connection with power supply unit,
fuse and other parts unless connection is run via the mains filter of the
AC drives;
● All components that are not electrically connected with the drive sys-
tem.
2. Interference-susceptible area (area B):
● Mains connections between drive system and mains filter for drives,
mains contactor;
● Interface lines of drive controller
3. Strongly interference-susceptible area (area C):
● Motor power cables including single cores
Never run lines of one of these areas in parallel with lines of another area so
that there is not any unwanted interference injection from one area to the other
and that the filter is jumped with regard to high frequency. Use the shortest
possible connecting lines.
Recommendation for complex systems: Install drive components in one cabinet
and the control units in a second, separate cabinet.
Badly grounded control cabinet doors act as antennas. Therefore, connect the
control cabinet doors to the cabinet on top, in the middle and on the bottom via
short equipment grounding conductors with a cross section of at least 6 mm
2
or, even better, via grounding straps with the same cross section. Make sure
connection points have good contact.
Bosch Rexroth AG
Electromagnetic Compatibility (EMC)
EFC 3600
152/259
DOK-RCON03-EFC-3600***-IT03-EN-P
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