... 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 ... 80% of power is countedOperating environment temperature-10°C~+40°CRelative humidity<90%, condensation is not allowedProtectionsOverload, instaneous ...