Danfoss vlt fcd 302 Operating Instructions Manual page 22

Installation
G G rounding shielded cable
Earthing (grounding) clamps are provided for motor and control wiring (see Illustration 2.10).
Illustration 2.10 Earthing (Grounding) Clamp for Motor and Control Wiring
1. Use a wire stripper to remove the insulation for
proper grounding.
2. Secure the grounding clamp to the stripped
portion of the wire with the screws provided.
3. Secure the grounding wire to the grounding clamp
provided.
Leakage current (3.5mA)
NOTE
Follow national and local codes regarding protective
earthing of equipment with a leakage current > 3.5mA.
The frequency converter technology implies high frequency
switching at high power. This will generate a leakage current
in the earth connection. RFI filtering and screened motor
cables contribute to this phenomenon. According to EN/
IEC61800-5-1 (Power Drive System Product Standard) which
implies special means if the leakage current exceeds 3.5 mA,
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VLT Decentral Drive FCD 302 Operating Instructions
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earth grounding must be reinforced in one of the following
ways:
RCD use
A fault current in the frequency converter or at the output
power terminals might contain a DC component, and
charging of the filter capacitors might cause a transient earth
current. Where Residual Current Devices (RCDs), also known
as Earth Leakage Circuit Breakers (ELCBs), are used, the
following must be taken into account:
MG.04.F2.02 - VLT is a registered Danfoss trademark
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•
Earth ground wire of at least 10mm
•
Two separate earth ground wires both complying
with the dimensioning rules.
•
Use RCDs of type B only
•
Use RCDs with an inrush delay
•
Use RCDs of 300mA, if possible
2 2
2
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