RFI Filtering

1336 PLUS II drives can be installed with an RFI filter, which controls radio-frequency conducted emissions into the main supply lines and ground wiring.

If the cabling and installation recommendation precautions described in this manual are adhered to, 

it is unlikely that interference problems will occur when the drive is used with conventional industrial elec

tronic circuits and systems. However, a filter may be required if there is a likelihood of sensitive devices or circuits being installed on the same AC supply.

Where it is essential that very low emission levels must be achieved or if conformity with standards is required the optional RFI filter must be used. 

Refer to Appendix C and instructions included with the filter for installation and grounding information.

Grounding

Refer to the grounding diagram on page 2–13. 

The drive must be connected to system ground at the power ground (PE) terminal provided on the power terminal block (TB1). 

Ground impedance must conform to the requirements of national and local industrial safety regulations (NEC, VDE 0160, BSI, etc.) and should be inspected and tested at

appropriate and regular intervals.

In any cabinet, a single, low-impedance ground point or ground bus bar should be used. 

All circuits should be grounded independently and directly. 

The AC supply ground conductor should also be connected directly to this ground point or bus bar.