Danfoss VACON 100 flow, Operating Manual, Page: 74 / 148

C D B A
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Illustration 29: Grounding via the Built-in RC Circuit
When disturbances are strong, the cable shield can be exposed and then 360 degrees grounded (see illustration 32 ) directly to the AC
drive ground (see illustration 31 ).
C D B A
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0b
h3
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Illustration 30: Grounding in noisy environment with good equipotential. If potentials at points A, B, C, and D are very different and cannot be
made similar, cut the shields as in Illustration Grounding in noisy environment with poor equipotential.
If ground potentials of the connected devices are different, cable shield that is connected at both ends causes current to flow in the
shield. To prevent this, the cable shield must be disconnected or cut at some point between the devices. Grounding should be done at
a location nearest to the place where the disturbances meet the cable (see
illustration 31 ).
C D B A
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Illustration 31: Grounding in Noisy Environment with Poor Equipotential. Example of Cutting Shield.
We recommend grounding the cable shield as in examples A and C (see illustration 32 ). Do not ground the cable shield as in example
B.
A B C
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A
Cable clamp
C Cable gland
B
Ground terminal
Illustration 32: Grounding the Cable Shield
Control Unit Operating Guide | VACON® 100 Wall-mounted Drives
AQ298036140958en-000101 / DPD01711
74 | Danfoss A/S © 2019.05