I usually include a input power line filter on servo and VFD
applications if there is a computer or PLC involved. I've done a few
machines without drive input filters and noise problems have bit me.
Fixing the problem after the fact costs more in wasted time than the
cost of the filter/s. Automation Direct was selling filters suited to
powering multiple drives. Not sure if they still do.
Where are you guys buying the Bergeda drives?
Ebay?
Thanks,
Dave
On 12/30/2020 3:13 AM, David Berndt wrote:
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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