Yaskawa v1000 2

[itsmoked]

What a delightful drive! Very solid piece of work.

I have one running a 1/2hp motor. The motor drives a chain thru an air powered clutch/brake. Every time the clutch engages(every 3 seconds) the motor takes a hit that the VFD supports. The motor actually stalled each hit until I reset the drive from "Normal Application",(pumps and fans and their ilk), to "Heavy Duty",(conveyors etc). That sets limits in the drive from 130% excursions up to 150%. This stopped all stalling. I then changed from scalar to vector and let the drive tune the motor. Everything is working fine now.

However, now and then the chain can jam on the product carriers. It jams hard. This starts a spectacular chain of nasty events since the product is eggs. LOL

I'm planning on using one of the digital outputs to tell the PLC to abort when a jam occurs. This will prevent 150 eggs from being forced through out of position chains.

I've discovered this drive has a torque overload sensing ability that is gated by a user set time. If the torque exceeds a certain amount for longer than a certain time the drive will close a contact.

Does this drive actually know what the torque is?? Or is this really the same as the current?





Technical manual link for it: (15MB)

http://www.yaskawa.com/site/dmdrive.nsf/(DocID)/MHAL-7JSLMA/$File/SIEPC71060618.pdf

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Skogsgurra]

All drives know their output torque when in vector mode. That is the definition, more or less, of vector operation.
The motor current is divided into two orthogonal components, the magnetizing current and the torwue producing current. That way, the drive always knows the true torque.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[jraef]

Torwue, that's Swedish for torque?



"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> faq731-376

 

[electricpete]

Good answer by Gunnar (as expected)
Just to add a little unecessary extra info, Krause gives the following expression for instantaneous torque:
Te = (3/2)*(Poles/2) * Lm * (iqs*idr' - ids*iqr')
The factor (iqs*idr' - ids*iqr') can be intuitively interpretted as cross product of stator current vector and rotor current vector, where each vector is represented by it's rectangular coordinates. Is = (ids,iqs). Ir' = (idr', iqr')
The drive uses a model to estimate rotor current from available measurements along with what you've told it about the machine.
There are other equation forms which describe the same relationship using different variables such as flux linkage instead of current, but this one seems simplest to me.

=====================================
(2B)+(2B)' ?

 

[Skogsgurra]

Yes, Jeff. Run it through Googletranslate to get the correct (and full) meaning of it.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[itsmoked]

Excellent answers all. Now I know and really know. Thanks!

Keith Cress
kcress -

http://www.flaminsystems.com