Hi All,
Prior to the recent holidays, I acquired a Hitachi SJ200-022NFU (capable of accepting 1 and 3 ph line power) and a Leeson 2HP 3ph 3400RPM motor.
I have 240 1ph service into the shop via a subpanel breakered at 60A at the main panel. Until now, the breaker feeding the subpanel has never tripped.
I connected the line and load wiring precisly as defined in the manual (2 legs of the 240 line power going to L1 and L2 and neutral going to the N/L3 lug while the VFD to motor connection is U to U1, V to V1, and W to W1). I also have the chassis ground of the motor connected to the chassis ground of the VFD. As my line power receptacle does not currently have a ground lug, I left the line side of the VFD ungrounded. I'll get a ground wire and appropriate recptacle prior to actual install and operation.
After double checking my connections, I plugged the power plug into the wall socket and shop immediately went black. None of the local subpanel breakers tripped, but the the 60A breaker did. This was an instantaneous, do not pass go event.
I have since looked over everything again, and all connections seem to be preceisly as they need to be. I have checked for shorts in all of my cables and plugs--all are as prescribed. I also checked the 240 circuit and everything checks out voltage wise.
I am stumped and unsure what to do next. I'm reluctant to plug it in again because I have changed nothing since the trip. I could sure use some advice. I am definitely out of my element here.
Thanks,
David