Auto Zero

rroie

rroie
wired up auto zero put all the parameters in the dialog boxes. Home machine, then it goes into the zeroing routine. All is well till it gets to the plate and does not stop. I did not have a 5.6K resistor so I put in a 6.8K resistor. Have right at 3 volts between tool and zeroing plate. Ordered the right resistor. Is the resistor my problem or is it something else? Does not go high.

Thank You

Roie
 

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aussiemike

aussiemike
Roie,

Test your input first. Hold your plate against the end mill to make sure it changes. I can t see which input your using. It should go high(red) when it touches. If your spindle isn t earthed, you ll need to clip an earth (Masso -ve) to the end mill to complete the circuit. If that doesn t work, use another input in case it s faulty. I ll bow to others expertise, but I d expect 6.8K to work.

cheers,

Mike
 

rroie

rroie
Does not go high(red) when it tool touches plate. Changed masso connection input from 32 to 30 same thing. Making connection ( 3 volts ) not enough? 24 volts before resistor.

Thank You

Roie
 

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breezy

Arie
Staff member
@rroie



The purpose of the resistor is to prevent a direct short across the power supply. The input should read the power supply voltage until it's pulled to ground by the tool in the machine.

Since you're seeing 3volts this suggests that you have a high resistive connection to ground/-ve in your wiring.

Please explain your connections in the photo. If the plate in the photo is your touch plate is it isolated from the machine?

Do these tests.

Between MASSO -ve and touch plate with the input wire disconnected, should be open circuit.

Between tool and MASSO -ve, should be short/low resistive circuit.

Between input wire (disconnected from plate) and MASSO -ve, should be supply voltage.

If any test fails you need to fix before Auto Zero will work.

Regards,

Arie.
 

rroie

rroie
Please explain your connections in the photo. If the plate in the photo is your touch plate is it isolated from the machine? (YES)

Between MASSO -ve and touch plate with the input wire disconnected, should be open circuit. (YES)

Between tool and MASSO -ve, should be short/low resistive circuit. (3 Ohms)

Between input wire (disconnected from plate) and MASSO -ve, should be supply voltage. (It is if the input wire is also disconnected from Masso)

As soon as you connect the input wire to Masso it pulls the voltage down to 3 volts.
 

breezy

Arie
Staff member
Quote from rroie on August 7, 2019, 1:56 am

Between input wire (disconnected from plate) and MASSO -ve, should be supply voltage. (It is if the input wire is also disconnected from Masso)

As soon as you connect the input wire to Masso it pulls the voltage down to 3 volts.

This proves your wiring is OK.

Normal input operation is to apply +ve to the input for it to go high.

So when first connecting a touch plate it shows high and you have to invert it. Then when you ground the plate with a tool it should go high.

What does the input display when you connect the touch plate wire to the MASSO input?

Can you toggle it between high/low with the space key?

Does it change state when you directly ground the touch plate?

Regards,

Arie.
 

rroie

rroie
What does the input display when you connect the touch plate wire to the MASSO input? ( stays the same, nothing)

Can you toggle it between high/low with the space key? (YES, stays the same)

Does it change state when you directly ground the touch plate? (NO)

Thank You for your patience

Roie
 

breezy

Arie
Staff member
OK this is pointing to a problem with the inputs on the MASSO.

Disconnect every thing to the touch plate input at the MASSO what happens?

Does toggling the space key change the state of the input?

Check against another input that hasn't be used before.

The MASSO I play with belongs to the Men's Shed and I only attend on Mondays so I can't check this out as to what should be happening.

Regards,

Arie.
 

rroie

rroie
Disconnect every thing to the touch plate input at the MASSO what happens? (There is just the one wire to the touch plate.) (Disconnected from Masso makes no difference>)

Does toggling the space key change the state of the input? (Space key changes the setting from low to high but nothing changes. No redlight)

Check against another input that hasn't be used before. (I have changed the input from 32 to 30 to 12.)

1,2,3 inputs are connected to the proximity limit switches.

Thank You

Roie
 

breezy

Arie
Staff member
@rroie

OK, what happens when you connect a input pin directly to MASSO +ve?

Also when you use a resistor to make that connection?

We want no other connections to the input when making these tests.

We should get a red indication in both cases.

Regards,

Arie.
 

rroie

rroie
-OK, what happens when you connect a input pin directly to MASSO +ve? (low goes to high)

I was going to try this but was afraid I would fry something.

I have a 5.1 and a 4.7 resistor.

-Also when you use the resistor to make that connection? (nothing)
 

rroie

rroie
I put a 5.1 resistor in and auto zero is working. It is going all the way up to the Z limit switch when it was done. Is this correct?

When I get the right resistor next week I will change it out.

Thank You again for all the help, great support

Roie
 

breezy

Arie
Staff member
It's working, the resistor is close enough, leave it as it is.

And yes when homing after tool zeroing it travels to the top of the Z axis. On a tool change it travels back to the place it was at when the tool change was requested.

Glad I was some help, don't know what changed, but to me it was looking like there was problem with MASSO inputs. The only thing that I can think of is that the 6.8k resistor was limiting the current to much to trigger the LED in the Opto isolator.

Regards,

Arie.
 
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