Adding a VFD to my Burke #4
Copyright 2008 by James P. Riser
This page shows the steps taken to add a VFD (Variable
Frequency Drive) unit to my Burke #4 milling machine. I wanted
complete variable speed and this was the least expensive method
to obtain the desired control.
The unit was delivered in this condition by UPS (their
usual careful handling of packages).
Fortunately nothing inside was damaged.
This is the contents of the box.
And inside this were the goodies...
This is the actual
Here are the connection terminals - nothing could be
L1 and L2 are the standard 115 volt input terminals.
T1, T2, T3 are the three phase lines from the motor.
looks like this.
Both ground wires from the input line and the motor
lines are attached to this common plate.
Here is the setting
at highest speed.
And a short movie illustrating
the speed with the drive set on the center pulley. Hopefully you
can get it to run on your computer.
The slowest setting.
And another short movie
showing the drive still on the center pulley but running at slow
speed. Hopefully you can see this movie too.
Both the fast and slow speeds can be altered by pulley
belt placement and with the VFD unit. This gives a fantastic range
of speeds at full torque.
Another nice feature is that the motor ramps up on
start and ramps down when shut down.
This little unit works beautifully.
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