... : 0.4-315KW ,0.01-650HZ ZY-A900 series of AC drives is our newest product of sensorless vector control type. The ... type, under-defined V/F curve and auto torque compensation. .DC BrakingDC braking frequency: 1.0~5.0 Hz, braking time ... unit, tele-control panelProtection FunctionInput out-phase, input under-voltage, DC over-voltage, over-current, over-load, current stall, over-heat ...