Factors affecting Delta's inverter motors and countermeasures

Create Date: 2024-8-30 12:03:23|Source: Delta/Delta

1. The influence of leakage current on the motor and countermeasures

If the wiring length is very long, the stray capacitance between the wires will increase, resulting in leakage current. It will initiate overcurrent maintenance, increase leakage current or not ensure the correctness of the current display. The worst condition is that the inverter will be damaged. If an inverter is connected to more than one motor, the wiring length should be the sum of the lengths of all wiring to the motor. If a motor driving a 460V model is installed between the inverter and the motor to prevent the motor from overheating, the heat accumulation station may malfunction, even if the cable length is less than 50 meters. In this case, an output reactor should be added (optional) or the carrier frequency should be reduced (parameter 00-17 "Carrier frequency") should be used.

                           Factors affecting Delta's inverter motors and countermeasures

2. The influence of surge voltage on the motor and countermeasures

When the motor is driven by the inverter PWM, the motor coil is relatively simple and has an adverse effect due to the surge voltage (dv/dt) generated by the switching of the inverter power crystal. If the cable of the motor is particularly long (especially in the inverter of the 460V model), the surge voltage (dv/dt) will cause the motor to deteriorate and damage the bearing. In order to prevent this phenomenon, please use the following ideas:

a.Use a motor with a high absolute edge

b. The wiring length between the inverter and the motor is reduced to the proposition value

c. Frequency converter with output reactor (optional)

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