Re: High frequency Inverter Trouble

If you don't change the input voltage ( same power source) the input voltage
can't be your problem. If you have a 200 v inverter then the motor it drives
needs to be a 200 volt wired motor. DON'T PUT a 200V INVERTER ON 400V.
Really a 1 1/2 hp KW inverter should run a 1 1/2 motor not a 1/2 HP motor.
THe current loop feed back will be reading eroneous readings. Cause you said
this is an older unit and I presume that it does not have a parameter to set
for running a smaller motor. (and you didn't specify a model number of the
drive).
<grumtac@xxxxxxxxxxxxx> wrote in message
news:1170982466.625807.31520@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Greetings fellas,

I have a High Freq inverter on an original motored Bridgeport M-head.
The inverter is rated for 1.5HP and is a single phase to 3 phase
capable unit.

The motor is plated as a 1/2HP 3 phase motor. There are 3 dots stamped
in the voltage section, and the amps are listed 25/13. I do not know
what the dots represent, but I assume 440/220. The inverter runs THIS
motor very well.

The Mill itself is a nice old compact horizontal Garvin machine, and I
had a 3 phase 460/230v motor laying around and I thought I would try
to drive that horizontal spindle with the same inverter. I'd just plug
in the spindle motor I want to use.

The problem is, while the Bridgeport motor runs great, the newer motor
will spool up properly and run for a while, but then slow down, speed
up, slow down, sometimes even stop. It will be locked in position when
stopped. Sometimes it will start to run again, speed up, slow down and
lock again. When it stays locked too long, it will fault the inverter.

The inverter is an old Hitachi, and most of what I have for a book is
written in another language.

Could it be that because I am feeding the inverter with 220v, the
motor acts up because it is a 460/230 motor ? I would just like to
know why it works perfectly on the one motor but not the other.

Any ideas ?

Thanks,
Grummy



.