Might want to read this. I know the owner of this company. He's a
good guy.
https://www.precision-elec.com/derate-three-phase-vfd-for-single-phase-power/
There are other cheap 5hp drives on Ebay.. but this would probably need
to be derated for single phase.. or not??
https://www.ebay.com/itm/UPDATED-220V-4KW-5HP-VARIABLE-FREQUENCY-DRIVE-INVERTER-VFD-NEW-/272864297426?_trksid=p2349526.m4383.l4275.c10
Really cheap!
Dave
On 1/1/2018 3:53 PM, Greg Bernard wrote:
Yes I did! Sorry.
https://www.driveswarehouse.com/?gclid=Cj0KCQiAsqLSBRCmARIsAL4Pa9T6TYOzrv9mH_DO_eki29PtK-inTHt_0W3FwgAUKC-Z19-jeWD0krAaAjZxEALw_wcB#&&fb=iv
On Mon, Jan 1, 2018 at 2:48 PM, John Figie <zephyr9...@gmail.com> wrote:
Greg,
I don't see a link. Did you forget to add it?
John Figie
On Jan 1, 2018 1:32 PM, "Greg Bernard" <marzetti...@gmail.com> wrote:
Check out this place. Good prices on drives and motors.
On Mon, Jan 1, 2018 at 11:46 AM, John Figie <zephyr9...@gmail.com>
wrote:
All,
Thanks for your replies.
My real question was to see if anyone had used GOHZ or some other cheap
drive. I currently run all my machines from a home made rotary phase
converter. It works pretty well but does not produce the best 3 phase.
Yes I know you can use capacitors to adjust the outputs which I have.
The
rotary converter has been running in my shop for about 15 years. I
have a
hydraulic automatic surface grinder that does n't like being run from
the
phase converter. The pump motor overheats when run from my rotary
converter, I think maybe this is because the motor runs near full load.
I know I can use a larger drive and derate it to use on single phase
power,
but that seems like a much more expensive option. Some drives have
missing
phase detection that I could probably trick with some kind of AC
input. I
think the concerns for me are that the input diode bridge will see the
input current distributed among 4 diodes but instead of 6. Also the
conduction angle of the diodes will be longer since all of the input
current must be supplied from the single phase rather than overlapping
phases. Finally the stress on the DC bus capacitors will be much higher
due
to the higher DC bus ripple. This bus capacitor RMS ripple current
degrades
the capacitors due to internal heating.
Now since this is a lathe spindle and I am a hobbyist how often will I
really need to load the machine to 5hp? Probably not very often. Also I
can
set the acceleration/deceleration to a conservative value to reduce the
peak currents. Additionally I think I could replace my rotary phase
converter (which is kind of noisy) with the VFD which will produce a
different kind of noise (electrical) but It will be quiet.
My motivation for asking about GOHZ is that I just discovered them and
they
have a $294 drive rated for single phase input so I would presume that
the
additional stress was considered in the design.
Automation direct does not list any VFDs of 5hp or higher rated for
operation from a single phase.
Here is what I have found so far listed on a spreadsheet.
https://docs.google.com/spreadsheets/d/1YS-
QKbJIlBYDSPdWAelA6ZF0zbS30HrHn
qE02-opSRI/edit?usp=sharing
If anyone knows of other options please let me know.
John Figie
On Mon, Jan 1, 2018 at 11:09 AM, Dave Cole <linuxcncro...@gmail.com>
wrote:
I have heard that sometimes you can get around that by putting a
motor
run capacitor between one of the live phases and the unconnected
input
power terminal.
That can sometimes trick the drive into thinking that it has power at
all
of the terminals.
Back when VFDs were very expensive the way to do this was with a
static
or
rotary phase converter.
I have a 5 hp 3 phase motor on an old turret lathe spindle that I run
off
a rotary phase converter that I put together a long time ago. It
works. You can find how to instructions on how to build one on the
net. You will need a 3 to 10 hp 3 phase motor as a base device for
the
converter.
You can also make a static 3 phase adapter for your existing motor
simply
by adding some capacitors to "power" the third phase. Info for that
is
also on the net.
Dave
On 1/1/2018 3:46 AM, Nicklas Karlsson wrote:
Usually there is a diode rectifier at the input but I guess they
also
measure voltage and refuse to run then to low so experience is
important.
On Sun, 31 Dec 2017 18:45:44 -0600
John Figie <zephyr9...@gmail.com> wrote:
I have a 5 hp 240V 3 phase induction motor that is for a lathe
spindle. I
only have single phase 240V power. It seems that most 5 hp vfds do
not
allow single phase input. I found this:
http://www.gohz.com/5hp-vfd
Does anyone have experience with GOHZ or other affordable 5 hp
drives
that
will run on single phase?
John Figie
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