In article ,
Steve wrote:
I just got a Sumitomo Heavy Industries AF3000 VFD for free. It is 5HP
w/ a digital key board on the face of the drive. I am having trouble
understanding the settings listed below. Also, if I change the Output
frequency do I need to change other parameters such as the "Max.
Voltage Output Frequency" or will the VFD adjust itself? Also, what do
these settings all mean? I just want to be able to vary the speed of
the 3 phase motor on my lathe. Maximum Hz is apparently 400. Also,
even though this is a digital setup can I install a pot to adjust the
frequency? Any help greatly appreciated. Thanks, Steve
What is the speed of your motor? If it is near 3600 RPM (e.g.
3450 RPM), I would suggest that you leave all the settings as they are,
as the rotor might not take higher speeds.
However, if the motor speed is slower, e.g. near 1800 RPM
(typically 1725 RPM), or near 1200 RPM (typically 1150 RPM), then the
rotor should handle higher frequencies, perhaps up to 120 Hz (which
would double the speed), because the manufacturer of the motor tends to
use the same rotor in multiple speeds of motor -- just changing the
number of poles in the stator.
All listed settings are "Factory Preset".
Max Output Frequency 60.0 Hz
Max Voltage 200.0 V
Max Voltage Output Frequency 60.0 Hz
Intermediate Output Frequency 1.5 Hz
Intermediate Output Frequency Voltage 11V
Min Output Frequency 1.5 Hz
Min Output Frequency Voltage 11V
Output Volatge Limiter Selector 0000
Now -- it might be a good idea to set the Min Output Frequency
to 15 Hz and the Intermediate Output Frequency as well, so you can't run
the motor at too low a speed. The reason for this is that the motor
derives cooling from a fan on the motor's own shaft, and it gets a lot
less cooling at lower frequencies. (You could use at the current 1.5 Hz
for short periods -- say five minutes at a time, but for a long running
job, this is asking for problems. Though you could set up an external
fan blowing into the motor and running from standard line frequency to
keep it cool -- if it isn't a TEFC motor, which depends on a fan inside
the motor with no openings to the outside.
Good Luck,
DoN.
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