Masso Output to Relay

[minimillaidan]

Hi Everyone,

New on this forum. Got a few queries regarding my solid state relay connection to masso.

1. What am i using the relay for?
   

The relay is being used to control a 3way 2 position air solenoid valve for a power drawbar. I used to have this all wired up for mach 3 software but have recently brought a masso g3

2. Whats the issue?

I have attached a quick picture of how i had the relay wired up to my last breakout board and power supply. I understand the pin 3 input on the solid state relay needs to go to the output pins on masso, however i used to have the pin 4 on solid state relay wired to ground on last BOB outputs, so this ground wire now do i just wire to a common ground in my control box or another ground on the masso board that is free?

Any help would be much appreciated - Thanks Aidan

 

[model-and-toolmaking]

I do not think you can use that relay. Masso 3 output is a signal output. It cannot carry the current for the relay. An Uno relay module is what you need. The module is powered by your power supply and has an input for the Mass3 signal.

 

[minimillaidan]

This relay is not putting any current into masso it simply uses masso to switch it on and off

 

[model-and-toolmaking]

If that relay has less than 5ma current than you can go to a ground on the Masso. I have never used a solid state relay. Hopefully someone smarter than me will reply.

 

[breezy]

@minimillaidan

Aidan,

If that relay has less than 5ma current

Wrong info supplied by Model and Toolmaking, max current draw on any MASSO G3 output is 50mA. Incorrect on my behalf it is 5mA, got confused with the G2 relay outputs which are 50mA.

As your device draws 3-32mA depending on the input voltage it is quite safe to use and in answer to your question

so this ground wire now do i just wire to a common ground in my control box or another ground on the masso board that is free?

For the electrons to get back to the power supply they came from you should connect to a "ground" connection on the MASSO, this prevents ground loops if you connect to the ground common.

MASSOs "ground" terminals is really a negative extension from the MASSO power input terminals.

Regards,

Arie.

 

[cncnutz]

Hi @minimillaidan

I have drawn a connection diagram for a solid state relay connected to Masso output. You show in your drawing that are using a DC power supply for the drawbar so I have drawn it for a DC Solid State relay.

Cheers Peter

 

[minimillaidan]

Hi Peter,

thanks for the response I ve attached an image as don t quite understand when you say connect -ve and +ve? As in if this is power connection how then do I wire pdb solenoid into this circuit.

the previous circuit I attached above that worked for switching the solenoid on and off on different software to masso. So can I not connect the same and have input 3 going to masso output and input 4 to - power then wire the output side the same as I previously had wired? (As shown in second picture I have attached)

thanks aidan

 

[supman]

maybe I don't understand but why do you need to use the solid state relay DC to AC power ?

the force and pressure comes from air supply not voltage.

I use festo DC 3 way 2 position solenoid valves all the time for pneumatic air cylinders to open /shut hopper gate no problem. is common in concrete industry.

maybe you can wire this direct as per Peter's diagram without solid state relay. 12V or 24v DC coil option. as you are using G3 Masso makes sense to use 24V

 

[minimillaidan]

I am using it to turn power drawbar for toolchanger on and off. I have previously used this setup with mach 3 however recently purchased masso g3 and wondered how to keep same setup for atc



thabks aidan

 

[breezy]

Quote from SUPMAN on April 6, 2020, 9:26 pm

maybe I don't understand but why do you need to use the solid state relay DC to AC power ?

the force and pressure comes from air supply not voltage.

I use festo DC 3 way 2 position solenoid valves all the time for pneumatic air cylinders to open /shut hopper gate no problem. is common in concrete industry.

maybe you can wire this direct as per Peter's diagram without solid state relay. 12V or 24v DC coil option. as you are using G3 Masso makes sense to use 24V

@supman

For the simple reason that the MASSO outputs are TTL (Transistor Transistor Logic) and they output 5v positive at 5mA.

So you need to use a relay board that has TTL opto isolation to protect MASSO.

You can use a board that has electromechanical relays with a TTL input or all-in-one SSR (Solid State Relay) which has the opto isolation and the correct type of output switch. ie AC or DC.

The MASSO G2 model had relay output drivers so you could use a 12v or 24v relay directly from the MASSO relay output, but these were removed in G3.

Sure the force comes from the air supply, but you need to switch that somehow! Hence the the SSR and solenoid.

@minimillaidan

Aidan,

Your drawing is the same as what Peter drew up. The "load" in Peter's drawing is your solenoid, he used "load, +ve & -ve" to be generic, for anyone else who may look at this topic. He also included an inline fuse to protect the power supply.

Regards,

Arie.

 

[cncnutz]

Hi @minimillaidan

The +ve & -ve is the power supply you show in your drawing. The load is your Power Drawbar solenoid. Fuse optional.

You are showing a DC power supply so I assume that you are not using the SSR shown in the first post as that is an AC version SSR with a Triac as the active output component. Once triggered it will not turn off until the voltage on the output side drops to zero.

That is why I picked a DC SSR for illustration purposes and drew on the output polarity because the DC output is polarity conscious.

Regardless of what you do in the output the input wiring remains the same. SSR Input positive terminal to Masso TTL output and SSR Input -ve to Masso Gnd.

No need to change the output side if it currently works and the input side is basically the same as what you previously had.

Cheers Peter

 

[minimillaidan]

Hi Peter,

Appreciate all help. I didn t realise I attached the ac dc SSR you are correct I m using dc dc I ve attached new picture of the one I m using. I will wire it up as shown and be back to let you know results.

thanks for help once again

aidan