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Wiring Of Frequency Inverter 21
V260 Series High Performance Closed-Loop Vector Inverter User Manual
4.2 CONNECTION
OF
OPTIONAL
FITTINGS
AND
FREQUENCY
INVERTER
1) Power supply: The power supply shall be in accordance with the specification of input power supply
designated by this operating manual.
2) Air switch:
y
When the frequency inverter is maintained or not in use for a long time, the air switch will separate
the frequency inverter from the power supply;
y
When the input side of the frequency inverter has failures like short circuit, the air switch can
protect.
3) AC input reactor: When the interaction of higher harmonic between the frequency inverter and power
supply cannot meet the requirements after serious wave form distortion of power grid or the frequency
inverter is equipped with DC reactor, the AC input reactor can be added. The AC input reactor can
improve the power factors at input side of the inverter and reduce the influence caused by unbalanced
voltage of three-phase power supply.
4) Filter at input side: EMI filter can be selected to restrict the high-frequency noise interference from the
power cord of the frequency inverter.
5) Contactor: It can cut off the power supply when the system protective function acts to prevent failure
expanding.
6) DC reactor: In order to defend the influence of power supply to frequency inverter, protect the inverter
and restrict higher harmonic, DC reactor shall be equipped under the following conditions:
y
When the power supply of frequency inverter has switch LBMJ on the node or with silicon controlled
phase control load, the voltage jump of the grid resulted from reactive transient caused by capacitor
switching and harmonic and grid wave form gap caused by phase control load may damage the
input rectifying circuit of the frequency inverter.
y
When the three-phase power supply of the frequency inverter is unbalanced;
y
When the power factors at the input end of the frequency inverter are required to improve.
7) Filter at output side: EMI filter can be selected to restrict the interference noise generated at the output
side of the inverter and wire leakage current.
Powe supply
Air switch
AC input
reactor
Contactor
Filter at
input side
Grounding
Frequency
inverter
DC reactor
Motor
AC output
reactor
Filter at
output side
Braking
resistor
Figure 4-2 Wiring of frequency inverter
¾
Standard built-in DC reactor for V260-4T0750G/4T0900P model and above.