V&T V5 Series User Manual page 18

Power supply
Circuit breaker
Leakage circuit
breaker
Contactor
Input AC reactor
or DC reactor
Input noise filter
Brake unit and
brake resistor
Thermal
protection relay
Output noise filter
Output AC reactor
Motor
8
high performance crane special inverter User Manual
Input power must meet the range specified by the product
The capacity of the circuit breaker shall be 1.5 ~ 2 time of the rated current of the inverter.
The time features of the circuit breaker shall fully consider the time features of the inverter
overload protection.
Because the inverter output is the high-frequency pulse, there will be high-frequency leakage
current.
Selection recommendations: It is suggested that B type leakage circuit breaker be used.
To ensure safety, please do not close and disconnect the contactor frequently, avoid frequent
power-on and off of the inverter, and avoid starting the inverter directly through the contactor.
1. Improve the power factor on the input side
2, effectively improve the three-phase input power imbalance caused by the system interference
3, improve the pulse current damage to the rectifier part of the device
4. Improve the higher harmonics on the input side to prevent damage to other equipment caused
by voltage waveform distortion.
5. Improve the influence of high-order harmonics on the input side on the inverter and reduce
external conduction and radiation interference.
Reduce the interference input from the power supply terminal to improve the anti-interference
ability of the inverter
Reduce external conduction and radiation interference of the inverter
Braking resistors and braking units must be added when fast deceleration is required or when the
motor is in a generating state
Some inverter brake units are built-in, please refer to the section "Brake resistor selection".
Although the inverter has motor overload protection function, when one inverter drives
two or more motors or multi-pole motors, to prevent the motor overtemperature failure,
thermal protection relay shall be installed between the inverter and each motor, and the
motor overload protection parameter P9.16 shall be set as "2" (motor protection
disabled).
When the output end of the inverter is connected with noise filter, the conduction and
radiation interference can be reduced.
When the cable connecting the inverter and the motor is longer than 100m, it is
suggested to install AC output reactor to suppress the high-frequency oscillation to
avoid the damage to motor insulation, large leakage current and frequent inverter
protective action.
Select the motor that matches the actual use
Chapter 2 Installation and Wiring of the Inverte