Appendix A Product Peripheral Components
A.1 The connection between the product and peripheral devices
Table A.1 Description of peripheral components of the main circuit
It can reduce the noise of the frequency converter from the input end of the power supply, and also
reduce the noise from the output of the frequency converter to the power supply end.
Output AC
Reactor
When the connecting line from the inverter to the motor exceeds 100 meters, it is recommended to
install an AC output reactor that can suppress high-frequency oscillation to avoid motor insulation
damage, excessive leakage current and frequent protection of the inverter.
Braking resistor
The mechanical energy in the braking process of the motor can be consumed in the form of heat
energy through the braking resistor, which can shorten the deceleration time of the drive system of
the inverter.
output noise
filter
Connecting a noise filter to the output of the frequency converter can reduce conduction and
radiation interference.
peripheral
devices
illustrate
breaker
The time characteristics of the circuit breaker should fully consider the time characteristics of the
inverter overload protection, the capacity of the circuit breaker is 1.2~2 times the rated current of
the inverter;
In order to avoid the grid impact caused by short circuit at the output end of the inverter or internal
fault, a circuit breaker must be installed at the input end of the inverter.
contactor
In order to ensure safety, please use a contactor, but do not use the contactor to control the start
and stop of the inverter. Frequent closing and disconnection of the contactor will reduce the life of
the inverter.
Input AC reactor
or DC reactor
When the following situations occur, please connect an AC reactor to the input end of the inverter
or install a DC reactor on the DC reactor terminal
1. The power supply of the inverter is greater than 600kVA or the capacity of the power supply is
greater than 10 times the capacity of the inverter ;
2. If there is a switch-type reactive power compensation capacitor or a thyristor phase-controlled
load on the same power node, a large peak current will flow into the input power circuit, which
will cause damage to the rectifier part;
3. When the voltage imbalance of the three-phase power supply of the inverter exceeds 3%, it will
cause damage to the rectifier part ;
4. The input power factor of the inverter is required to be greater than 90%.
Input Noise Filter
084
NVF2G-S Series Inverter User's Guide
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