Spindle Coolant Temperature

[deanr181]

Hi guys,

I have a digital thermostat (STC-1000) connected to my spindle to monitor the running temperature.

I have a coolant flow meter to monitor the flow of coolant through the spindle, but i also want to monitor the temperature of the coolant (using the STC-1000 unit.)

What i want to do is have the system stop should the temperature get to a preset high temperature but i do not want to hook the thermostat relay through the E-Stop.

I cant hook it up to the Low Lubricant input as this does not shut down the machine.

Is there any other way i can do this, as well as have an error message show up stating "Spindle Over Temp" or something similar?

Thanks

Dean

 

[breezy]

@deanr181

Dean,

Send a request to MASSO support for Spindle Coolant Temp Alarm to be added to the configurable input list. That is what I did to get the Coolant Flow Alarm.

You will need to supply information as to what you want to happen when your temp sensor trips. (Goes high)

You can use the email address at the top of the forum page or (better) use the form at the bottom of the contact page.

Had a google for unit, but only found temp controller to either heat or cool. Suppose you could use the heat contact in negative switching mode (positive through 5.6k resistor on input)(fail safe wiring) with the MASSO input inverted.

Regards,

Arie.

 

[evermech]

@deanr181

you could consider using your digital thermostat to trip a relay that turns on a stack light when there is an over temperature situation. That would alert you to the issue without turning anything off on the cnc. Could be an option until Masso sets something up for you.

Guy

 

[deanr181]

Thanks Arie and Guy,

Very good suggestions.

I will send Masso a request to add this and see what happens.

In the meantime, i will just wire through E-Stop to be safe.

Thanks again

Regards

Dean

 

[deanr181]

Quote from Breezy on March 17, 2020, 12:50 am

@deanr181

Dean,

Send a request to MASSO support for Spindle Coolant Temp Alarm to be added to the configurable input list. That is what I did to get the Coolant Flow Alarm.

You will need to supply information as to what you want to happen when your temp sensor trips. (Goes high)

You can use the email address at the top of the forum page or (better) use the form at the bottom of the contact page.

Had a google for unit, but only found temp controller to either heat or cool. Suppose you could use the heat contact in negative switching mode (positive through 5.6k resistor on input)(fail safe wiring) with the MASSO input inverted.

Regards,

Arie.

Hi Arie,

Could you please explain the 5.6k resistor method you mention. i am quite new to this. Can't we just input a direct 12V to the Masso inputs to trigger?

Thanks

Dean

 

[breezy]

Dean,

Could you please explain the 5.6k resistor method you mention. i am quite new to this. Can't we just input a direct 12V to the Masso inputs to trigger?

If you switch 12v into the input, it will trigger MASSO but when you remove the 12v the input is floating and the wiring can act as antenna and the electrical noise introduced could cause false triggering. Using negative switching mode the input is in either positive or negative states, no floating input. Not too sure of the input voltage range but the trigger point is low about 1v.

If you have a look at the drawing associated with the Touch Plate documentation, you can see that the input is held high by 12v behind the resistor until the tool touches the plate at which point the input is pulled low to negative. So just replace the touch plate / tool combination with the switch that is closed when the coolant is below the trip temp, this way if a wire breaks or the temp unit fails the circuit is broken and MASSO shuts down. Always try to wire in a failsafe method ie. broken wire will trigger fault condition. The resistor is there so the power supply is not shorted out.

Regards,

Arie.

 

[deanr181]

Thanks for the detailed explanation. Fully understand now.