... communication interface 4Vector sensorless control Details of the frequency converter ZY-A900 series of AC drives is our ... stage-speed control.Accessorial frequency Sourcegiven digit, given analog voltage, given analog current, PID adjusting and stage-speed ... , tele-control panelProtection FunctionInput out-phase, input under-voltage, DC over-voltage, over-current, over-load, current stall, over- ...