Hub van Doorneweg 8 • 2171 KZ Sassenheim – NL •
T
+31(0)252 228850 •
F
+31(0)252 228235 •
E
I
euronormdrives.com
Hub van Doorneweg 8 • 2171 KZ Sassenheim – NL •
T
+31(0)252 228850 •
F
+31(0)252 228235 •
E
I
euronormdrives.com
56
57
NEURN030000_220_A
NEURN030000_220_A
8.3 EMC directive
8.3.1 Harmonic effect
The higher harmonics of power supply may damage the inverter. Thus, at some places where the quality of power system is relatively poor, it is
recommended to install AC input reactor.
8.3.2 Electromagnetic interference and installation precautions
There are two kinds of electromagnetic interference, one is the interference from electromagnetic noise in the surrounding
environment to the inverter, and the other is the interference from the inverter to the surrounding equipment.
Installation Precautions:
1) The earth wires of the Inverter and other electric products ca shall be well grounded;
2) The power cables of the inverter power input and output and the cable of weak current signal (e.g. control line) shall
not be arranged in parallel but in vertical if possible.
3) It is recommended that the output power cables of the inverter shall use shield cables or steel pipe shielded cables
and that the shielding layer shall be grounded reliably, the lead cables of the equipment suffering interferences shall use
twisted-pair shielded control cables, and the shielding layer shall be grounded reliably.
4) When the length of motor cable is longer than 50 meters, it needs to install output filter or reactor.
8.3.3 Remedies for the interference from the surrounding electromagnetic equipment to the inverter
Generally the electromagnetic interference on the inverter is generated by plenty of relays, contactors and electromagnetic
brakes installed near the inverter. When the inverter has error action due to the interference, the following measures is
recommended:
1) Install surge suppressor on the devices generating interference;
2) Install filter at the input end of the inverter, please refer to Section 6.3.6 for the specific operations.
3) The lead cables of the control signal cable of the inverter and the detection line shall use the shielded cable and the
shielding layer shall be grounded reliably.
8.3.4 Remedies for the interference from the inverter to the surrounding electromagnetic equipment
These noise interference are classified into two types: One is the radiation interference of the
inverter, and the other is the
conduction interference of the inverter. These two types of interference cause that the surrounding electric equipment
suffer from the affect of electromagnetic or electrostatic induction. Further, the surrounding equipment produces error
action. For different interference, please refer to the following remedies:
1) Generally the meters, receivers and sensors for measuring and testing have more weak signals. If they are placed
nearby the inverter or together with the inverter in the same control cabinet, they easily suffer from interference and
thus generate error actions. It is recommended to handle with the following methods: Away from the interference
source as far as possible; do not arrange the signal cables with the power cables in parallel and never bind them
together; both the signal cables and power cables shall use shielded cables and shall be well grounded; install ferrite
magnetic ring (with suppressing frequency of 30 to 1, 000MHz) at the output side of the inverter and wind it 2 to 3
turns; install EMC output filter in more severe conditions.
2) When the interfered equipment and the inverter use the same power supply, it may cause
conduction interference. If
the above methods cannot remove the interference, it shall install EMC filter between the inverter and the power supply
(refer to Section 6.3.6 for the selection operation);
3) The surrounding equipment shall be separately grounded, which can avoid the interference caused by the leakage
current of the inverter’s grounding wire when common grounding mode is adopted.
