4-11
H Controller 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 set with n050.
The number of internal switching times is reduced, so noise can be reduced to some extent.
S Install an output noise filter.
Install the 3G3IV-PHF Input Noise Filter on the power input side of the Inverter.
S Install an output noise filter.
Install the 3G3IV-PLF Output Noise Filter on the output side of the Inverter.
S Use a metal box and pipes.
Metal
can block of
f radio waves.
Therefore, enclose the Inverter with a metal (steel) box to prevent
radio waves from being emitted from the Inverter.
H 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
min.,
operating time of 0.1 s min.) or one with high-frequency countermeasures for inverters.
Reducing the carrier frequency value set with n050 is also effective.
A
leakage current increases in proportion to the cable length. Normally
, an approximately leakage cur
-
rent of 5 mA is generated per meter (cable length).
H Machine Vibrates
D Mechanical System Makes Noise
The carrier frequency and the natural frequency of the mechanical system are resonating.
If
the mechanical system is
making high-pitch noise while the motor is operating normally, the carrier
frequency
and the natural frequency of the mechanical system are resonating, in which case, change
the carrier frequency with n050 so that the mechanical system will not resonate.
Operation Chapter 4
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