Chapter 1 IntroductionMS300
1-5
1-5 RFI Jumper
1 The drive contains Varistors / MOVs that are connected from phase to phase and from phase to
ground to prevent the drive from unexpected stop or damage caused by 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.
2 In models with a built-in EMC filter, the RFI jumper connects the filer 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. 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 helps, but the EMC performance of
each drive is no longer guaranteed.
Frame A–F Screw Torque: 4–6 kg-cm / [3.5–5.2 lb-in.] / [0.39–0.59 Nm]
Loosen the screw and remove the RFI jumper (as shown below).
Tighten the screw again after you remove the RFI jumper.
Frame B–F (model with built-in EMC filter)
Remove the RFI jumper with a slotted screwdriver (as shown below).
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