Electrical Installation
‑150‑
7.5 Grounding
7.5.1 Grounding Requirements
To correctly ground the AC drive, observe the following requirements:
● Ground the grounding terminal to avoid electric shock. Comply with the relevant
local electrical regulations for grounding.
● To prevent electric shocks, check that the protective grounding conductor meets
the technical specifications and local safety standards, and use a shortest possible
grounding cable. The leakage current of the AC drive can be over 3.5 mA. Use a
copper wire with a cross‑sectional area of at least 10 mm
2
for the protective
grounding, or use two protective grounding conductors of the same specifications
for connection according to EN 61800‑5‑1.
● Follow the instructions for grounding every AC drive when multiple AC drives are
installed. Incorrect grounding may lead to malfunction of AC drives.
● Disconnect the optional grounding screw of VDR (available on the AC drive) before
the voltage resistance test. Failure to comply may fail the test.
● Use a proper yellow‑green copper cable for the protective grounding conductor,
and avoid connecting it to switchgears such as circuit breakers in series.
● Reliably ground the grounding terminal. Failure to comply may result in abnormal
operation of the AC drive and even damage.
● Avoid connecting the grounding (PE) terminal to the N terminal of the neutral wire
of the power supply.
● Mount the equipment onto a conductive metal surface (recommended) to ensure
well connection between the entire conductive bottom of the equipment and the
mounting surface.
● Fasten the grounding screws using the recommended tightening torque to avoid
loose or excessively tight fixing of the protective grounding conductor.
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