If Peripheral Devices Like Plc's Or Other Are Influenced By The Starting Or Running Inverter; If The Earth Leakage Breaker Operates When A Run Command Is Input; If There Is Mechanical Oscillation - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

If peripheral devices like PLC's or other are influenced by the starting
or running inverter
If electrical noise is generated by Inverter perform the following countermeasures:
Change the Inverter's Carrier Frequency Selection (C6-02) to lower the carrier frequency.
•
Install an Input Noise Filter at the Inverter's power supply input.
•
Install an Output Noise Filter at the Inverter's output.
•
Make sure that motor and inverter are grounded properly.
•
Separate main circuit wiring from control circuit wiring.
•

If the Earth Leakage Breaker Operates when a RUN Command is Input

The Inverter performs internal switching, so there is a certain amount of leakage current. This may cause the
ground fault interrupter to operate and cut off the power supply. Change to a ground fault interrupter with a
high leakage detection level (i.e., a sensitivity current of 200 mA or higher, with an operating time of 0.1 s or
more), or one that incorporates high frequencies (i.e., one designed for use with Inverters). It will also help to
some extent to lower the Inverter's Carrier Frequency Selection (C6-02). In addition, remember that the leak-
age current increases as the cable is lengthened.

If There is Mechanical Oscillation

The machinery is making unusual sounds.
The following causes are possible.
There may be resonance between the mechanical system's characteristic frequency and the
carrier frequency.
If the motor is running with no problems and the machinery is oscillating with a high-pitched whine, it may
indicate that this is occurring. To prevent this type of resonance, adjust the carrier frequency with constants
C6-02 to C6-05.
There may be resonance between a machine's characteristic frequency and the output fre-
quency of the Inverter.
To prevent this from occurring, either use the jump frequency functions in constants d3-01 to d3-04 or install
rubber padding on the motor base to reduce oscillation.
Oscillation and hunting occur.
The gain and time constant adjustments for the torque compensation may be insufficient. Lower the gain set-
tings and raise the delay time settings. Also adjust the hunting prevention function (N1-
Oscillation and hunting occur with PI control.
If there is oscillation or hunting during PI control, check the oscillation cycle and individually adjust P and I
constants. (Refer to
-16
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