Longs DM542A wiring

shadetree

Shadetree
Hello, I'm wondering if anyone has set up a 48" x 48" mill with Longs motors DM542A? The power from the Masso is only giving 3.2 volts and the stepper calls for 5, is this causing my movement problems? Pics if needed can be sent.

Using

Nema 23 420 oz motors.

MD542A steppers

3 axis with slaved Y

3KW spindle, but haven't got to wiring that yet.

5 turns to inch ball screws.

Any help would be great!

Thanks
 

masso-support

MASSO Support
Staff member
that voltage difference will not have any issue in motion.

What issue are you facing with your setup?
 

shadetree

Shadetree
The Y and Z axis will move only in one direction no matter if i toggle in + or -. It also is making horrible sounds, scattering and jerky movement.

I'm reading 3.2 volts on the D- and D+ coming off the Masso.

I have attached a pic of the controls hopefully you can see something I have wrong?
 

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shadetree

Shadetree
Also forgot to add I'm running drives at 36 v.

in a standing still position, on Masso axis S+ is 3.5, S- 0, D+4.0, D- 0
 

masso-support

MASSO Support
Staff member
I could be wrong on this but from the photo it looks like the 4th stepper drive on the extreme right is wired wrong.

Your red wire going into the direction - terminal. Shouldn't it be either a white or clear wire? I can't clearly see the drive connections on that one but I'm assuming it is the B axis and the DIR- and PUL- would be linked together, see the link below.

https://www.masso.com.au/masso-documentation/?section=longs-motors



If you mean the Z axis is running backward that can be reversed easily in the Masso settings. Just check the invert direction box in the Z axis setup.

Cheers

Peter
 

shadetree

Shadetree
yes you are correct, the red wire is a jumper between D- and P-with the clear wire running back to G. Photo attached.

The Z is always running in the same direction no matter what the invert is set at.
 

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masso-support

MASSO Support
Staff member
That clears that up.

If I understand correctly the X axis is working ok but the Y and Z are not.

If that is the case I would turn everything off, unplug the X and Z axis plugs at the Masso end and swap the plugs over. If the problem is at the Masso end then the Z axis on the machine will now work properly when you move the X and the X axis on the machine will only move in one direction. If the X axis on the machine continues to work properly when you move the Z on Masso and the Z on the machine still moves in one direction only then I would take a look at the motor wiring. You can't swap X & Y forthese tests because it is slaved and I assume the motors are in place and would rack the gantry.

The easiest way to test the motor wiring is to swap the motor plugs at the drives, always remembering to turn things off first before unplugging things.

These simple tests should point to where the problem is.

Cheers

Peter
 

shadetree

Shadetree
First thing I want to say is Thank you for the help!

I've been in the HVAC controls industry for over 36 years so I've seen my share of control builds. I have been so confused on this one that I must say I was about to quit. The problems would show up as motors running the same direction one time then no movement at all to humming and buzzing. I re-wired the motor leads many times, I re-soldered the connections over and over but the problems would just keep moving.. I was soooo frustrated!

Well I found it,,, the aviation plugs that I purchased and installed at the control cabinet have a keeper so they are supposed to only be able to be plugged in at one position. Turns out the keepers on mine do not do a thing so they can be plugged in at any position they feel like, meaning every time I thought they where plugged in the same spot they where in fact rotating and connecting in different positions causing random situations.

Bottom line, when building from scratch you have to be so careful and check everything, even things you think cant be the problem.

Masso support was very responsive and I appreciate the help.

Thanks.
 

masso-support

MASSO Support
Staff member
That's great news and the solution was far stranger than I could have guessed.

Glad you got it sorted.

Cheers

Peter
 
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