Specifications are subject to change without notice. Pictures are just an example. For special features and/or customization, please ask to our sales network. 23/03/2011
15
EMI
connections:
It is very important that the connections between the inverter, the shielded motor cable, and
the EMI filters are tested as follows.
• Use a metal grounding plate and place the frequency inverter and the EMI filter on the plate.
• 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)
• 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.
• Don't solder a conductor to the shielding.
• 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.
• 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.
• The only earth connection between the LISN and the test plate should be via the EMI filter.
• Use a motor which equals the power rating or below of the inverter rating.
• Install a noise filter for inverter onto the output side of the primary circuitry can suppress
conducting noise.
Class B:
Class A:
Power
S
upply
Main Tran
s
former
Power Drive
s
y
s
tem (PD
S
)
Metal Plate or Panel
EMI Filter
Drive
TM2
Remote control
s
witche
s
,
relay
s
or
s
imilar e
q
uipment
s
L
MCCB
Power Port
M
L
M
N
L1
L2
3ØIM
Power
S
upply
Main Tran
s
former
Power Drive
s
y
s
tem (PD
S
)
Metal Plate or Panel
Drive
TM2
Remote control
s
witche
s
,
relay
s
or
s
imilar e
q
uipment
s
MCCB
Power Port
L1
L2
T3
T1
T2
3ØIM
W
G
U
V
T3
T1
T2
W
G
U
V
When the distance between the inverter and motor is longer than 100 meters, cable wire
should be carefully chosen to reduce the wiring resistance below 3% and the voltage drop (V)
=
√
3 x Wire resistance ( /km) x wire length (m) x current x 10
-3
RVDF Advanced User Manual