Variable frequency drives
Variable frequency drives give smooth speed control of three-phase induction motors in pumps, fans, compressors and workshop machines. Models with a single-phase input let you run a three-phase motor even where only a single-phase supply is available, and they also provide soft starting and stopping.
Variable frequency drives
Drives with a 230 V single-phase input and a 230 V three-phase output need a motor with a 230/400 V rating plate connected in delta. Some models, according to the manufacturer, deliver a 380 V output from a single-phase supply, while others work with a 380 V three-phase input and output.
You can set the output frequency up to 400 Hz with the potentiometer, the panel buttons or external inputs. Only set frequencies above 50 Hz within the limits allowed by the motor and machine manufacturers. The PID function keeps pump pressure constant, the RS485 interface allows remote control and a braking resistor shortens stopping times.
Choose a drive whose rated current is equal to or higher than the motor current. Single-phase capacitor motors won’t work with a drive. Have the installation done by an electrician, fit IP20 units in a dry enclosure and, after disconnecting, wait a few minutes before touching the terminals so the capacitors can discharge.
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