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Author Topic: smooth stepper stops when using z-axis to throw switch  (Read 6951 times)

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Offline Jeff_Birt

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Re: smooth stepper stops when using z-axis to throw switch
« Reply #10 on: March 15, 2012, 07:26:16 PM »
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When the z axis is activated to trigger the #4 output using a brain, it will sometimes work. But every once in a while, the E-stop is activated when the #4 output is set back to "off".

This sounds like noise from the solenoid turning off is causing interference. When an inductive load, like a solenoid or motor, is turned on or off an electrical spike is generated which can cause problems. You can fit a snubber across the relay to reduce the noise generated.
Happy machining , Jeff Birt
 
Re: smooth stepper stops when using z-axis to throw switch
« Reply #11 on: March 15, 2012, 08:03:01 PM »
Whats a snubber?
-jim

Offline Jeff_Birt

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Re: smooth stepper stops when using z-axis to throw switch
« Reply #12 on: March 17, 2012, 10:28:22 AM »
A snubber (or arc snubber) is an electronic component that contains a special type of capacitor and a resistor in side it. You fit it across the relay contacts and it help to keep an arc from forming when the contacts open/close. I like to use a line filter mounted close to the spindle motor as well. The line filter will keep most of the electrical noise from the motor from propagating through the system.
Happy machining , Jeff Birt