Omron SYSDRIVE 3G3JV Series User Manual page 124

Maintenance Operations
7-2-8 Controller or AM Radio Receives Noise when
Inverter is Started
Noise derives from Inverter switching.
Take the following actions to prevent noise.
Lower the carrier frequency of the Inverter in n46.
The number of internal switching times is reduced, so noise can be reduced to
some extent.
Install an Input Noise Filter.
Install an Input Noise Filter on the power input area of the Inverter.
Install an Output Noise Filter.
Install an Output Noise Filter on the output area of the Inverter.
Use metal tubing.
Electric waves can be shielded by metal. Therefore, enclose the Inverter with a
metal tube.
7-2-9 Ground Fault Interrupter is Actuated when
Inverter is Started
Leakage current flows through the Inverter.
The Inverter performs internal switching. Therefore, a leakage current flows through
the Inverter. This leakage current may actuate the ground fault interrupter, shutting
the power off.
Use a ground fault interrupter with a high leakage-current detection value (sensitivity
amperage of 200 mA or more, operating time of 0.1 s or more) or one with high-fre-
quency countermeasures for Inverter use.
Reducing the carrier frequency value in n46 is also effective.
In addition, remember that a leakage current increases in proportion to the cable
length. Normally, approximately 5 mA of leakage current is generated for each meter
of cable.
Chapter 7
7-15