Hi John,
You've got me a bit interested in these drives. I'm currently looking for
the biggest single phase servo I can easily find, looks like the Bergerda
1.8 or maybe even 2.6kw might be it. But it's always a bit hard to tell
with the lower quality documentation these companies provide. Can you
confirm/deny that the 1.8kw can run on single phase? What drive model
number are you using?
Anyone else have any experience with the 2.6kw Bergeda? Looks like the
LiChaun A4 series might also be of interest?
Thanks,
-Dave
On Sat, 26 Dec 2020 13:48:29 -0500, John Dammeyer <[email protected]>
wrote:
I looked at prices for a 2HP 3phase and a VFD (like Hitatchi
Vectorless?) and found without shipping the price was approaching $600.
For less than that I ended up with Bergerda.
I'm using a Bergerda AC Servo 110SM series (1.8kW, 6NM) on my spindle,
currently with a cheap PWM module until I wire up a second BoB for
step/dir control. With PWM I get 100RPM to 3000RPM without a belt
change. With stepper I can have it move very very slowly.
I also swapped in, for testing, a smaller 60SM series 1.27NM Bergerda
onto the X axis. Once I read the manual correctly I got step and
direction working well. The drive isn't overly large but is a bit
bigger than the HP_UHU which runs the brushed servo motors also 1.2 NM.
This video shows it now working. I can get 180ipm on the X axis just
like the much bigger DC Servo.
https://youtu.be/43liAVILgHY
The Gecko Stepper G213V driver on the knee has now failed for the second
time melting the connector again. Absolutely no response from Gecko so
it's being scrapped and FedEx tracking says my new Bergerda AC 80SM
series servo (3.5NM) will arrive on Wednesday along with 2 more of the
small 60SM units.
They aren't cheap compared to stepper motors. In my case I get to
remove a complete Toroidal power supply that runs only the stepper but
is big enough for the entire mill with 60VDC motor drivers.
The DC Servos and Harmonic drive (controlled with STMBL) run on a 105DC
Toroidal power supply. I could remove this and run the Harmonic off
110VAC to DC with a smaller isolation transformer. Then I'd have room
for the Bergerda drives.
This is the MACH3 Road Runner with the much bigger DC Servos and the
1200 oz-in (drops to 3.5NM at 300RPM) on the knee.
https://youtu.be/OUQzyp-3WXY
I've found support and price excellent, shipping horrendous. For
example I found that when the spindle stopped it would sometimes sit
with a bit of a squeal. A quick email to Bergerda and discussion and we
figured out which parameters to tweak. Now it's dead quiet. And much
smaller than the single phase 1.5kW 2HP motor.
http://www.autoartisans.com/mill/NewPulleys-1.jpg
John Dammeyer
-----Original Message-----
From: Dave Cole [mailto:[email protected]]
Sent: December-26-20 9:44 AM
To: [email protected]
Subject: [Emc-users] Chinese VFDs with good reputations
What low cost Chinese drives have you guys used with great success?
I'm talking mostly single phase input drives.
There are a lot of look a likes on Ebay.�� Some are dirt cheap. Others
not so much.
Some specify that they are specifically for water cooled spindles, etc.
Others say almost nothing.
Dave
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