External Spindle Speedc controller

kiwicnc

KiwiCNC
I have a KB Electonics KBM-225D speed controller currently running my 2HP 180VDC motor

Is conneftion to the MASSO possible - I've attacheda copy of the KBMM manual. It looks likes it can do it, but to be sure I'd like to some expoert views

As he motor is on a mini mill I am limited to the motor size. Currently running a 2HP 180VDC treadmill motor @ 8000rpm, and works really we.

Idally I can control the spindle stop/start and RPM from GCode or the Masso screen



Cheers



Ray
 

Attachments

  • kbmm_smt_manual.pdf
    584.9 KB · Views: 18

masso-support

MASSO Support
Staff member
please do not connect MASSO directly to a drive like this, it will burn the controller. These drives need optical isolation on signals and without that the mains voltage will enter into the controller and damage it.
 

kiwicnc

KiwiCNC
Don't worry, I have no intention's of connecting anything to the MASSO without first consulting MASSO directly.

Doyou have a recomeconded solution./design I can utlise to achive this soltuion result



Cheers

Ray
 

masso-support

MASSO Support
Staff member
it really depends on the spindle drive design and there is no one solution for this, if you have electronics knowledge then either you can make your own isolator or contact the drive manufacturer as some of them provide isolation modules.
 

clover

clover
@kiwicnc

Ray it looks like this unit may resolve your speed control dilemma. It provides optical isolation as well as having a 0-10V control input. Additionally, it piggy-backs onto your KBMM. Probably worth a look.
 

kiwicnc

KiwiCNC
Thanks Clover

I came to a similar conclusion on that part. I was going to try and find someone who could confidently confirm the suitability and provide some guidance of wiring. I might take a further look at the wiring detail tonight

My main purpose of building the enclosure and going for a Masso was for this level of control



cheers

Ray
 

clover

clover
Yes Ray, it looks pretty straightforward. I am a bit unsure about how the speed will track the input voltage though.

If you are looking for an exact speed match over its control range I don't believe this unit will give you that, mind you it will be pretty close but not exact (don't ask me to put a figure on it!). The reason is that opto-isolators are not 100% linear devices. There are ways to design around this but this device is a relatively inexpensive unit and doesn't have the fairly sophisticated circuitry required to effect this. The unit manual is here.

Hope this helps and good luck, Patrick
 
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