Single-Phase to 3-Phase Converter VSDs
EMHEATER offers two single-phase to 3-phase Converter products (for AC Motors only). These converters are however complete Variable Speed Drive (VSD) units which merely also converts the Single-Phase (220V) power supply to a 3-Phase output. Note that these Converter VSDs can be used to run AC motors only, so if there are any other 3-Phase components the Converter VSD cannot be used to supply power for that (cannot be used as a 3-Phase Power Supply for resistance loads such as an Oven/Welding Machine etc.).
Note that many 3-Phase motors can often be wired to use either a 3-Phase 220V OR 3-Phase 380V power supply – depending on this there are 2 different models to select from (select a kW option based on the kW and Amp rating of your motor):
- G1: Single-Phase (220V ±15%) Input and 3-Phase (~220V) Output
- G13: Single-Phase (220V ±15%) Input and 3-Phase (~380V) Output – ideally use a size option larger than that of the motor kW for this model (Motor Rated Amps < 70% of Converter VSD Output Amps)
Please refer to your motor nameplate to verify whether the motor is 3-Phase 220V or 3-Phase 380V (or possibly allow for both options). Please see image below as reference:
Please Note (Converter VSDs):
- Important to note that the requirements for the supply side Amps is high in order to generate the 3-Phase output from a Single-Phase 220V supply – for the G13 model (~380V output), expect the supply side Amp requirements to be ~4 times the rated motor Amps and for the G1 model (~220V output), expect the supply side Amp requirements to be ~2 times the rated motor output Amps. Please ensure cabling, switches and power supply is sufficient for the supply side Amp requirements.
- For high duty applications a Converter VSD rating (kW) option larger than the motor rating (kW) is recommended and for heavy duty / industrial applications a Converter VSD rating (kW) option of two sizes larger than the motor rating (kW) is recommended (please contact us for verification if necessary). A larger size option Converter VSD is also recommended for Fan and Pump motors with 8 Poles or more and for other motors with 6 Poles or more (if torque is high) as well as for low efficiency motors (e.g., submersible borehole pumps).
- Note that if the cable between the Converter VSD and motor is more than 50m, we would also recommend that you install an Output Choke/Reactor, for cables more than 150m we recommend installing a SineWave Filter (instead of the Output Choke/Reactor).
- Please use Copper power cables between the Converter VSD and Motor rather than Aluminium cables (impedance of Aluminium cables are higher and cause more harmonics).
- Use the Converter VSD to Start and Stop the motor, do not disconnect the supply from the Converter VSD to the motor while it is running. Also do not disconnect the power supply to the Converter VSD while it is running the motor.
Please see video illustration HERE.
