5-13
S Install an input noise filter.
Install an input noise filter (3G3EV-PLNF) on the power input side of the Inverter.
S Install an output noise filter.
Install an output noise filter (3G3IV-PLF) on the output side of the Inverter.
S Provide a separate power supply for the sensor.
If the sensor malfunctions, provide a dedicated power supply for the sensor and
install a noise filter on the power supply. For the signal line, use a shielded cable.
5-2-8 AM Radio Receives Noise when Inverter is
Started
•Noise derives from Inverter switching.
Take the following actions to prevent noise:
S Reduce the carrier frequency of the Inverter.
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 (3G3EV-PLNF) on the power input side of the Inverter.
S Install an output noise filter.
Install an output noise filter (3G3IV-PLF) on the output side of the Inverter.
S Use metal box and piping.
Metal can block off radio waves. Therefore, enclose the Inverter with a metal
(steel) box to prevent radio waves from being emitted from the Inverter.
5-2-9 Ground Fault Interrupter is Actuated when
Inverter is Started
•Leakage current flows through the Inverter.
Because switching is performed inside the Inverter, 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 second or more) or the one with
high-frequency countermeasures (for Inverter).
Reducing the carrier frequency value is also relatively effective.
Note also that a leakage current increases in proportion to the cable length. Normally,
an approximately 5 mA leakage current is generated per meter (cable length).
Operation Chapter 5
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