7-15
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.
S 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.
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.
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.
Maintenance Operations Chapter
7
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