MASSO spindle connector 0-10V DC Output

charlie70101

Charlie70101
I've been a CNCer for many years but I'm new to Masso. I recently ditched the computer and Mach3 due to Smooth Stepper errors and purchased a Masso G3 5 axis mill controller. I have a 4X4 wood router and all features seen to work just fine. I'm very pleased with it. I do have one question though. I noticed that the voltage on pin 1 of the Masso spindle connector ( 0-10V DC Output) measures 0.066 VDC with no command to run the spindle from Masso. This equates to about 158 rpm on my 0-24000 RPM spindle. I thought I might have wired something wrong so I disconnected the pin 1 wire but I still measure 0.066 VDC on pin 1. Is this normal? I would have thought that with no run command the voltage would be zero.
 

masso-support

MASSO Support
Staff member
the voltage will never be exact 0.00 and there is always some buffer in the drives for a cut off voltage point. Generally, you can set it on your spindle drive.
 

charlie70101

Charlie70101
It actually does try to run at that voltage although the speed is very unstable. I have a Hitachi WJ200 VFD and I did find a parameter called Input active range start voltage. You set it as a percentage of the analog input voltage. I'll try that tomorrow. Thanks for your help.
 

testyourdesign

testyourdesign
@charlie70101

My takeaway from this is that it would be prudent to measure the actual voltage output on the Masso and make sure the VFD operating parameters are set to function within that range in order to prevent unexpected results.

I never thought to do this when I hooked it up but I had a similar issue with my spindle drive remaining active when Masso indicated it was off. This caused the spindle to run intermittently and unexpectedly before I realized there was still voltage on the output causing the issue. I fixed it on my machine using the drives external on/off control input with a simple relay connected to the Masso spindle output.

This post gives me food for thought to see if the drive has a minimum voltage setting.

Thanks for sharing!

Cheers, Stephen Brown
 

charlie70101

Charlie70101
Followup. I set the "Input active range start voltage" parameter on my VFD to 5% which equates to 1000rpm on my spindle. I'll never need to run that low. The spindle now will not run below 1000rpm. I worked like a charm. It was never a big problem but was annoying to watch the spindle trying to run at a very low speed not to mention the fact that it might have had a sharp tool in it. Thanks again.
 

masso-support

MASSO Support
Staff member
Hi Charlie70101

Could I just ask why you are not using the spindle on /off connection on your VFD?

I could be reading this wrong but you appear to be relying on the spindle speed to turn on and off your spindle rather than the dedicated on /off connections.

Cheers

Peter
 

masso-support

MASSO Support
Staff member

Attachments

  • Masso-to-VFD-Hitachi-WJ200.png
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charlie70101

Charlie70101
Hmmmm...that may be my problem. The Run light on my VFD stays on all the time. I have pins 5 & 7 tied to "L" on the VFD instead of P24 with the jumper between PLC and P24 . That's the way it used to run before I installed the Masso. Looks like I need to move the jumper to from PLC ->P24 to L->P24 and connect Masso term 5 & 7 to P24 with Masso term 4 tied to VFD term 1 and Masso term 6 tied to VFD term 2. That would explain why any voltage will cause the spindle to turn regardless of a start command. Attached is my current wiring.
 

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cncnutz

CNCnutz
Staff member
Hi Charlie70101

The first step is to go through the VFD video in the link above and get the on / off working with manual switches. Make some voltage measurements and that will tell you how it should be connected. If you can't make it work with a manual switch it work on Masso.

According to the manual there are 2 different ways to wire the Fwd & Reverse, Current sink or Current source. There may be programming needed depending on which option you choose but getting it working manually will soon sort that out.

Cheers Peter
 

charlie70101

Charlie70101
Peter:

I tested and changed the spindle wiring per the drawing you sent and I'm happy to say that everything works great now. The spindle run light only comes on when I there is a spindle start command from the the Masso. No more need for the "Input active range start voltage" override on the VFD. Thanks again for your help.
 

charlie70101

Charlie70101
Peter:

I tested the wiring per your drawing on my VFD and it worked so I changed my setup from sink logic to source logic match the drawing. Glad to say that everything works great now. The "run" light on my VFD is now only lit when there is a run command from the Masso. I was able to remove the "Input active range start voltage" parameter override that I previously set in the VFD programming. Thanks for all your help.
 
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