Rfi Jumper - Delta CFP2000 Series User Manual

1-5 RFI Jumper

(1) In the drive there are Varistor / MOVs, which are connected from phase to phase and from phase to
ground, to protect the drive against mains surges or voltage spikes.
Because the Varistors / MOVs from phase to ground are connected to ground via the RFI jumper, the
protection will be ineffective when the RFI jumper is removed.
(2) In the models with built-in EMC filter the RFI jumper connects the filer capacitors to ground to form a
return path for high frequency noise to isolate the noise from contaminating the mains power.
Removing the RFI jumper strongly reduces the effect of the built-in EMC filter. Although a single drive
complies with the international standards for leakage current, an installation with several drives with
built-in EMC filter can trigger the RCD. Removing the RFI jumper helps, but the EMC performance of
each drive would be no longer guaranteed.
Frame A
RFI-1
RFI-2
RFI-1
RFI-2
RFI-1
RFI-2
1-5
Chapter 1 IntroductionCFP2000
Figure 1-4