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Usually you'll write both neutral-to-phase and interphase voltage for clarification. 230/400 V mains voltage is generally used allover Europe and also in India or Pakistan. Most industrial drives are using the same voltage.
Single phase vfd's are used for lower capacity motors. The output cann't be measured using multimeter. These vfd's are converting AC to DC then again convert to AC to control speed By changing voltage and frequency.
Does the internal circuitry & rectification setup remain the same in both types of drives whether Input is 220V single phase & output 220V 3 phase OR Input is 220V 3 phase & output 220v 3 phase OR Input 380V 3 phase & output is 400 V 3 phase ????
NO, In single phase it uses 4 diodes to rectify and total current is low but in 440v 3 phase system uses 6 diodes and handling current also higher...so they uses different methods to handle...the overall operations same for all types but the way of handling is different....
There are two complementary answers
- there's no regular use for a 230V 3AC converter in a plant with 400 V power supply.
- if you want to use it for some speacial reason, you'll need a 3-phase transformer