... such as underground coal mines, other mines, oil and chemical industries etc, especially applicable to control the ... frequency, current, power, motor speed, load rate, input and output torque, etc.Fault status displayOvervoltage, undervoltage, over load ... Feedback automatically torque200%20%100%environmentApplicable scopeRisk places with explosive gas or dustAltitudeAltitude is not more than 3000 ...