Chapter 3 Start Up
VFD-E Series
Revision August 2006, 01EE, SW--PW V1.03/CTL V2.03 2-21
2.6 RFI Jumper
Main power isolated from earth:
If the AC motor drive is supplied from an isolated power (IT power), the RFI jumper must be cut off.
Then the RFI capacities (filter capacitors) will be disconnected from ground to prevent circuit
damage (according to IEC 61800-3) and reduce earth leakage current. Refer to the following figures
for the position of RFI jumper.
Frame A
(on the top)
Frame B
(at the right side)
Frame C
(at the left side)
CAUTION!
1. After applying power to the AC motor drive, do not cut off the RFI jumper. Therefore, please
make sure that main power has been switched off before cutting the RFI jumper.
2. The gap discharge may occur when the transient voltage is higher than 1,000V. Besides,
electro-magnetic compatibility of the AC motor drives will be lower after cutting the RFI jumper.
3. Do NOT cut the RFI jumper when main power is connected to earth.
4. The RFI jumper cannot be cut when high voltage tests are performed. The mains power and
motor must be separated if high voltage test is performed and the leakage currents are too high.
5. To prevent drive damage, the RFI jumper connected to ground shall be cut off if the AC motor
drive is installed on an ungrounded power system or a high resistance-grounded (over 30 ohms)
power system or a corner grounded TN system.
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