Electrical Design Guide
‑50‑
Grounding the control cabinet system
The most cost‑effective method of suppressing interference in a control cabinet is to
isolate the interference source from devices that may be interfered with. Divide the
control cabinet into multiple EMC compartments or use multiple control cabinets
based on the intensity of interference sources, and install each device in accordance
with the following wiring principles.
Table 3–16 Wiring requirements
No.
Wiring requirements
1
Place the control unit and the drive unit in two separate control
cabinets.
2
If multiple control cabinets are used, connect the control cabinets by
using a PE cable with a cross‑sectional area of at least 16 mm
2
for
equipotentiality between the control cabinets.
3
If only one control cabinet is used, place different devices in different
compartments of the control cabinet based on signal intensity.
4
Apply equipotential bonding to devices in different compartments
inside the control cabinet.
5
Shield all communication (such as RS485) and signal cables drawn from
the control cabinet.
6
Place the power input filter in a position near the input interface of the
control cabinet.
7
Apply spray coating to each grounding point in the control cabinet.
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