Emotron VS Series Quick Start Guide
- 37 -
Fig 3-27 4.0
～
22kW RFI jumper schematic
ATTENTION:
1. When power is applied to the AC motor drive, do not cut off the RFI jumper.
2. Make sure main power is switched off before cutting the RFI jumper.
3. 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.
4. Do NOT cut the RFI jumper when main power is connected to earth.
5. The RFI jumper cannot be cut when Hi-pot tests are performed. The mains power and motor must be
separated if high voltage test is performed and the leakage currents are too high.
6. 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.
3.7 EMI Solutions
Due to its working principle, the drive will inevitably produce certain noise that may influence and
disturb other equipment. Moreover, since the internal weak electric signal of drive is also susceptible
to the interference of drive itself and other equipment, EMI problems shall be inevitable. In order to
reduce or avoid the interference of drive to external environment and protect drive against interference
from external environment, this section makes a brief description of noise abatement, ground handling,
leakage current suppression and the application of power line filters.
3.7.1 Noise Abatement
When peripheral equipment and drive share the power supply of one system, noise from drive
may be transmitted to other equipment in this system via power lines and result in misoperation or
faults. In such a case, the following measures could be taken:
1) Mount input noise filter at input terminal of the drive;
2) Mount power supply filter at power input terminal of affected equipment;
3) Use isolation transformer to isolate the noise transmission path between other equipment and
the drive.
leakage current of inverter will cause equipment misoperation and/or faults.
Disconnect the grounding connection of equipment may avoid this misoperation and/or faults
cable could be put into metallic conduits between which the distance shall be no less than 20cm, and
shall be kept as far away from drive and its peripheral devices, cables as possible. Never make signal
