Vfd Wiring to Masso G3

[minimillaidan]

Hi,

I recently purchased a new motor and vfd for my machine,

i have attached the pdf document for the vfd and was wondering if anybody could help me with how to wire this to my masso g3.

I would like to be able to control the motor in forward and reverse and have a motor brake which i was told is possible with this vfd and motor

Thanks in advance

Aidan

 

[derekmccoy]

The easiest one is the negative, that one just goes to your common ground. The positive common is asking for 5v so you could either use a phone charger, or I also read someone here took the 5V from the USB port on Masso. Not sure how safe plugging that into a VFD is. You could also wire yourself up a voltage divider using some resistors, or buy an adjustable voltage regulator.

As for direction, that VFD seems to take CW/CCW signal on one pin and Start/Stop on another pin, almost like step/dir. Masso outputs CW on one pin and CCW on another. I'm inclined to say join one of each of Masso's CW and CCW pins into one and plug it into Start/Stop, then take the other CCW pin and plug it into the drives F/R input. But I'm not sure, I'd wait for @masso-support or @breezy to respond.

Also, your VFD has speed control of 0-5V. Masso outputs 0-10V so you could use a voltage divider again or use PWM. I'd try PWM first.

 

[cncnutz]

Hi Adrian,

Looking at the VFD you have chosen it looks like it does not conform to any of the Masso VFD requirements. Masso uses separate Forward, Reverse switches.
Instead it has an Start/Stop and a CW/CCW switch. In addition to that it requires a 0-5 volt speed signal while Masso uses 0-10v

As I see it you will need to connect the start/stop through Masso spindle control CW switch pins 4& 5 and use M3 to turn the spindle on.
If you want to use reverse you will need to install the Masso relay module and assign a relay to one of the assignable outputs eg 4 then use Gcode like M64 P4 to set CCW and M65 P4 for CW
You will need to modify your post processor to output the required gcode. Use the relay NO contact to operate the CW /CCW selection of the VFD.

clock wise:
M65 P4
G04 P1000
M3

Counter clockwise:
M64 P4
G04 P1000
M3



If you only wanted CW rotation then you would just wire the Start / Stop to Spindle contro pins 4 & 5 and not need the relay and special gcode at all.

To solve the voltage issue I would suggest a resistive dropper circuit to reduce the 0-10V output of Masso down to 0-5V using a circuit like the one below.

Cheers
Peter

 

[derekmccoy]

Sorry, replied on the wrong thread.​

 

[minimillaidan]

Quote from CNCnutz on July 13, 2020, 7:37 pm

Hi Adrian,

Looking at the VFD you have chosen it looks like it does not conform to any of the Masso VFD requirements. Masso uses separate Forward, Reverse switches.
Instead it has an Start/Stop and a CW/CCW switch. In addition to that it requires a 0-5 volt speed signal while Masso uses 0-10v

As I see it you will need to connect the start/stop through Masso spindle control CW switch pins 4& 5 and use M3 to turn the spindle on.
If you want to use reverse you will need to install the Masso relay module and assign a relay to one of the assignable outputs eg 4 then use Gcode like M64 P4 to set CCW and M65 P4 for CW
You will need to modify your post processor to output the required gcode. Use the relay NO contact to operate the CW /CCW selection of the VFD.

clock wise:
M65 P4
G04 P1000
M3

Counter clockwise:
M64 P4
G04 P1000
M3



If you only wanted CW rotation then you would just wire the Start / Stop to Spindle contro pins 4 & 5 and not need the relay and special gcode at all.

To solve the voltage issue I would suggest a resistive dropper circuit to reduce the 0-10V output of Masso down to 0-5V using a circuit like the one below.

Cheers
Peter

Peter,

I understand that it doesn't conform with the exacting requirements of masso vfd requirements, however this is a much more superior motor and vfd that i would like to use for my machine conversion, a lot of motors people often use on smaller machine builds are normally too big or heavy this is perfect size and offers good speeds, torque etc that other motors dont offer, that is my reason for motor and vfd choice.

With regards to wiring for forward and reverse rotation I will have to dig a bit further with manufacturer as to wiring this to masso and see what they can recommend.

Finally the resistive dropper circuit you mentioned I have found this what do you think with regards to the suitability for dropping the voltage?

https://uk.banggood.com/LM2596-DC-D...tCh0ltwOvEAkYCSABEgKJz_D_BwE&cur_warehouse=CN

Thanks

Aidan

 

[breezy]

@minimillaidan

Aidan,

Finally the resistive dropper circuit you mentioned I have found this what do you think with regards to the suitability for dropping the voltage?

You've got the wrong idea regarding the voltage dropping circuit that Peter gave you. The 0->10v output for speed control is a variable voltage, eg. it changes between 0 and 10v to tell the VFD what speed to run the motor at. 10v is max speed, 1v is 1/10 of max speed. Now the circuit from Peter, will give you a proportional value of the MASSO output depending on the ratio of resistance in the top half to the overall resistance. The purpose of the variable resistance in the middle is to adjust the signal going into your VFD to 5v when MASSO is outputting 10v.

What you found is a voltage regulator, that outputs a constant voltage (adjustable) from a constant input voltage in the range 4-40v.

Regards,

Arie.

 

[jens]

Hello,

Can I step in this very interesting discussion?

My machine used a 1.1kW 3 phase 380v motor for the spindle. My intention is to use a Siemens V20 VFD because I have it available.

0-10V is OK but the inputs are 24V with one for start/stop (Marche/arr t) and another for reverse (inversion).

@peter can I do like your suggestion with the relay module board.

• One relay for start/stop with pin 4 and 5 from MASSO spindle.
  
• A second relay with assignable pin for reverse.
  

Will this work?

King regards

Jens

 

[jens]

And the picture!

 

[cncnutz]

Hi Jens,

I saw that picture in the VFD manual but if you look on page 50 / 51 you will see that you can configure an input as parameter 2 On reverse / OFF1

Would this give you the separate on/off reverse signal that you need?

Cheers Peter

 

[cncnutz]

Found this which shows a simple FWD Stop REV setup

Cheers Peter

 

[jens]

Hello Peter,



Thank you for your unbelievably fast and precise answer. Thank you also for all your very helpful videos.

Will try this today.

King regards

Jens

 

[jens]

Hello Peter,

Got it working, stand alone fisrt as in your video. It took me quiet a while to find out why it would no drive, the reverse and run symbols where on the display but the Hz where always on zero. Was also emiting the typical sound but not moving at all.

I found reading the other pagest of your documentation that there is the parameter P1032 that needs to be turned to Z ro to enable reverse.

Thank you again and have a nice day.

Jens