I have been trying to make my 10 HP VFD accept single phase input. (it
works GREAT with three phase input) It gives me a phase
fault. According to the schematic, the only way it detects phase fault
is by drops in bus voltage.
I added a big DC capacitor and it is not helping.
I measured bus voltage.
Single phase input: 314 volts
Three phase input: 342 volts
I also tried to connect L2 to L3 and it did not fix the phase fault.
** ALL OF THIS IS IN COMPLETE ABSENCE OF LOAD **
So, assuming that phase fault is detected by bus voltage:
1) Is that really true that three phase rectifier would give a higher
bus voltage than single phase (given same input voltage)
2) What can I practically do to cheat this device and make it accept
DC generated by single phase.
I do have a 10 KVA ACME transformed that I could use to boost the
input voltage from, say, 230v to 250v or some such.
- posted 13 years ago