8-24
8-2-9 Controller or AM Radio Receives Noise when
Inverter is Started
·Noise derives from Inverter switching.
Take the following actions to prevent noise.
S Lower the carrier frequency of the Inverter in n080.
The number of internal switching times is reduced, so noise can be reduced to
some extent.
S Install an Input Noise Filter.
Install an Input Noise Filter on the power input area of the Inverter.
S Install an Output Noise Filter.
Install an Output Noise Filter on the output area of the Inverter.
S Use metal tubing.
Electric waves can be shielded by metal. Therefore, enclose the Inverter with a
metal tube.
8-2-10 Ground Fault Interrupter is Actuated when
Inverter is Started
·Leakage current flows through the Inverter.
TheInverterperformsinternalswitching.Therefore,aleakagecurrent flowsthrough
the Inverter. This leakage current may actuate the ground fault interrupter, shutting
the power OFF.
Useagroundfaultinterrupterwithahighleakage-currentdetectionvalue(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 n080 is also effective.
In addition, remember that a leakage current increases in proportion to the cable
length.Normally,approximately5mAofleakagecurrentisgeneratedforeachmeter
of cable.
Maintenance Operations Chapter 8
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