Appendix A Foreign Standards
-
346
-
A.5 Solutions to Current Leakage
The controller outputs high-speed pulse voltage, producing high-frequency leakage
current during running of the controller.
current. Therefore, it is necessary to select an ELCB with rated operating current of
200 mA above.
100 mA. Therefore, it is necessary to select an ELCB with rated operating current of
100 mA and above.
The controller generates DC leakage current in protective conductor. In this case, a
time-delay B-type ELCB must be used.
If multiple controllers are used, an ELCB must be provided for each controller.
1)
■
Controller capacity
■
Carrier frequency
■
Types and length of motor cable
■
2) When the leakage current causes the ELCB to act, you should:
■
Increase the rated action current of the ELCB.
■
Replace it with a time-delay B-type ELCB with high-frequency suppression function.
■
Reduce the carrier frequency.
■
Shorten the length of the output drive cable.
■
Install a current leakage suppression device.
■
Use Chint Electric and Schneider brands.
A.6 Requirements on residual current device (RCD)
the protective earthing conductor. Thus install a type-B RCD at primary side of the
power supply. When selecting the RCD, you should consider the transient and steady-
state leakage current to ground that may be generated at startup and during running
of the servo drive. You can select a specialized RCD with the function of suppressing
high harmonics or a 300 mA general-purpose RCD with a residual current that is 2 to 4
times the protective conductor current.
To Next Page
Loading...
Need help?
General
