External input parameter error
Check whether the external input parameters are set correctly, such as starting mode and frequency, and ensure that the correct input signal is selected on the local panel of the inverter.
External input signal line problem
Check whether the external input signal line is connected correctly, including the start signal line and the fault signal line; At the same time, it is also necessary to check whether the electrical characteristics of the signal line meet the requirements.
Control parameter setting problem
Check whether the inverter control parameters are set correctly, such as startup time, cas delay and other parameters, which need to be set according to the application requirements.
Fault protection trigger
When the inverter fails or is protected, the external input terminal may not be able to start the inverter. At this time, it is necessary to check the fault code of the inverter and deal with it accordingly.
Hardware damage of frequency converter
If the above methods can't solve the problem, it may be caused by the hardware damage of the inverter. At this time, it is necessary to contact professional and technical personnel in time to repair or replace the inverter.