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NOTE
Do not plug/unplug the electronic part with
power voltage switched on.
Protective ground
The ground connection serves several purposes.
•
Safety ground (Protective ground, PE)
The equipment must be properly grounded
according to local regulation. This equipment has a
leakage current > 3.5 mA AC. It must be connected
to an ground connection complying with the local
rules for high leakage current equipment.
Proper installation grounding
74
Decentral Solutions
Typically, this implies that the PE conductors
must be mechanically enhanced (minimum cross
section 0.4 in (10 mm)
•
Noise "clamping" (high frequencies)
Stable communication between units call for
shielding of the communication cables (1).
Cables must be properly attached to screen
clamps provided for that purpose.
•
Equalization of voltage potential (low frequencies)
To reduce alignment currents in the screen
of the communication cable, always apply a
short grounding cable between units that are
connected to the same communication cable (2)
or connect to a grounded frame (3).
•
Potential equalization: All metal parts, where the
motors are fastened, must be potential equalized
PE connections, voltage equalizing cables and
the shield of the communication cable should be
connected to the same potential (4)
Keep the conductor as short as possible and use
the greatest possible surface area.
The numbering refers to the figure.
MG.90.F2.22 - VLT is a registered Danfoss trademark
2
) or duplicated
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