YASKAWA Varispeed G7 Series Instruction Manual page 62

Installing a Noise Filter on Output Side
Connect a noise filter to the output side of the Inverter to reduce radio noise and inductive noise.
Inductive Noise:
Radio Noise:
Countermeasures Against Inductive Noise
As described previously, a noise filter can be used to prevent inductive noise from being generated on the out-
put side. Alternatively, cables can be routed through a grounded metal pipe to prevent inductive noise. Keep-
ing the metal pipe at least 30 cm away from the signal line considerably reduces inductive noise.
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2
Power
ELCB
supply
Inverter
Electromagnetic induction generates noise on the signal line, causing the controller to malfunction.
Electromagnetic waves from the Inverter and cables cause the broadcasting radio receiver to make
noise.
Fig 2.9 Installing a Noise Filter on the Output Side
Power
ELCB
supply
Inverter
Fig 2.10 Countermeasures Against Inductive Noise
Noise
filter
IM
Radio noise
AM radio
Inductive
Signal line noise
Controller
Metal pipe
IM
30 cm min.
Signal line
Controller