4 Electrical wiring and precautious SV600 Series User Manual
38
5) The cable ducts must be in good connection and well grounded. Aluminum ducts can be used
to improve electric potential.
6) The filter, the frequency inverter, the motor should be well connected with the system
(machinery or device) and the installed part is sprayed and protected, and the conductive metal
is fully contacted.
Fig. 4-17 Cable wiring
Requirements for leakage current
1) Due to the output of the frequency inverter is high-speed pulse voltage, it will lead to
high-frequency leakage current generates. In order to prevent electric shock and leakage fire,
please install a leakage circuit breaker with the inverter.
2) The leakage current generated by each frequency inverter is about 100 mA, so the induced
current of the selected leakage circuit breaker should be to larger than 100 mA.
3) High-frequency pulse interference may cause malfunction of the leakage circuit breaker after
interference. Therefore, leakage circuit breaker with high frequency filtering should be selected.
If several inverters need to be installed, each inverter should be provided with a leakage circuit
breaker.
The factors that will affect the leakage current as follows:
Frequency inverter capacity
Carrier frequency
The type and length of motor cable
EMI filter
When the leakage current generated by the frequency inverter causes the leakage breaker to
action, the following steps should to be done:
Increasing the sensitivity current value of the leakage breaker
Replace another leakage circuit breaker which has high-frequency inhibition effect.
Decrease carrier frequency
Shortening the length of the output cable
Add leakage suppression devices