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A-17
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■ Disposal
If an inverter is no longer usable, dispose of it as industrial waste.
1.4.3 What to do about the leak current
Warning
Current may leak through the inverter's input/output wires because of insufficient electrostatic capacity on the motor with
bad effects on peripheral equipment.
The leakage current’s value is affected by the carrier frequency and the length of the input/output wires. Test and adopt
the following remedies against leak current.
(1)Effects of leak current across ground
Leakage current may flow not just through the inverter system but also through ground wires to other
systems. Leakage current will cause earth leakage breakers, leakage current relays, ground relays, fire
alarms and sensors to operate improperly, and it will cause superimposed noise on the CRT screen or
display of incorrect current detection with the CT.
Power
supply
ELCB
Inverter
Inverter
M
M
ELCB
Leakage current path across ground
Remedies:
1.If there is no radio-frequency interference or similar problem, detach the built-in noise filter
capacitor, using the grounding capacitor disconnecting switch or tap.
⇒ See section 1.3.2-2.
2.Reduce PWM carrier frequency.
The setting of PWM carrier frequency is done with the parameter
H.
Although the electromagnetic noise level is reduced, the motor acoustic noise is increased.
3. Use high frequency remedial products for earth leakage breakers.