13
connections:
It is very important that the connections between the inverter, the shielded motor cable, and the EMI
filters are tested as follows.
z
Use a metal grounding plate and place the frequency inverter and the EMI filter on the plate.
z
Use a shielded motor cable with 4 connectors (U, V, W, & Earth), don’t use the shielding as
safety earth (shield is high frequency earth)
z
Remove any paint around the two metal coupling nut holes. So that the metal coupling nuts
(and the shielding) make contact with the frequency inverter and the motor.
z
Don't solder a conductor to the shielding.
z
Use a metal clamp to connect the shielding from the motor cable with the metal grounding
plate. Now there is a perfect high frequency earth connection between frequency inverter,
grounding plate and EMI filter.
z
Keep the distance between the frequency inverter and EMI filter as short as possible (< 30cm)
if longer use a shielded cable with a metal coupling nut and a metal clamp to connect the
shielded cable to the frequency inverter and metal grounding plate.
z
The only earth connection between the LISN and the test plate should be via the EMI filter.
z
Use a motor which equals the power rating or below of the inverter rating.
z
Install a noise filter for inverter onto the output side of the primary circuitry can suppress
conducting noise.
Drive
Class B:
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