Chapter 1 IntroductionMH300
1-5
1-5 RFI Jumper
The drive contains Varistors / MOVs that 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 with the RFI jumper,
removing the RFI jumper disables the protection.
(1) In models with a built-in EMC filter, the RFI jumper connects the filter capacitors to ground to form a
return path for high frequency noise in order to isolate the noise from contaminating the mains power.
Removing the RFI jumper strongly reduces the effect of the built-in EMC filter.
(2)
Although a single drive complies with the international standards for leakage current, an installation
with several drives with built-in EMC filters can trigger the RCD. Removing the RFI jumper can help,
but the EMC performance of each drive is no longer guaranteed.
Non-built-in EMC filter models
Frame A–I
Loosen the screw and remove the RFI jumper (as shown below). Fasten the screw again after you remove
the RFI jumper.
Screw Torque: 4–6 kg-cm / (3.5–5.2 lb-in.) / (0.39–0.59 Nm)
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