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Messages - MN300

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I assume your goal is for each E-Stop switch to kill power to all motors and signal the Mach 3 controller.

Each box would need to be modified to accept an external E-Stop signal, output an E-Stop signal to the other box and to signal Mach 3. This is not a trivial task. Details of each box will have to be known to plan the modification. It would be difficult, if not impossible, to obtain enough extra contacts to add to the existing E-Stop switches. Adding a small relay to each box can provide extra contacts.

Power for the relays would need to be available when the boxes are off. This means a supply not switched off in E-Stop mode.
Contacts from the relays would be substituted for the E-Stop switch contacts in each box.
The E-Stop switches contacts could then be used control the relays.
Contacts from each relay would be wired in series to signal the Mach 3 controller.

A simpler way to protect your machine would be to add an additional E-Stop circuit that kills power to the two boxes and signals Mach 3. More than one switch could used. The new E-Stop switches would need two contacts, one for power, one for Mach 3. The switches on the boxes would not be used in an emergency.

General Mach Discussion / Re: Index
« on: March 16, 2020, 11:38:57 AM »
Since this worked at one time something has changed. Either there is a wiring fault or the sensor has been damaged.

Mach4 General Discussion / Re: false signals from clearpath enable
« on: March 16, 2020, 11:33:53 AM »
Your message says "I will get an erroneous limit switch event.".  I would expect the limit switches to be connected to the C10 so I don't understand your mention of the Clearpath unit. Am I missing something?

General Mach Discussion / Re: Index
« on: March 16, 2020, 10:43:22 AM »
The reading of 4. to .9V at the emitter pin 3 does not make sense. If the emitter is working the voltage there should be well over 1 V.

Let's try going back to the setup that once worked. Can you try the power supply you called the Travel Adapter again?

Mach4 General Discussion / Re: false signals from clearpath enable
« on: March 16, 2020, 10:12:32 AM »
The conventional method of using the C10 inputs for limit switches would be to set the C10 jumpers for COM = GND  and PULL-UP. Then the normally closed contacts of the switches are used to pull the inputs to ground when the switch is not activated. Is this how you wired your machine?

General Mach Discussion / Re: Index
« on: March 16, 2020, 09:38:38 AM »
I am trying to think of a combination of events to explain what you see.
If the emitter is not working then room light could explain the flickering output. If this is the case then shielding the sensor will increase the output voltage.

As I mentioned before the output of the emitter can be checked with a digital camera. To test your camera you can point your TV remote control at the camera and push a button. You will see a flickering light. Once you see this work you can move on to checking the emitter.

The voltage from earth to the junction of the emitter and the resistor should be 1.7V.

General Mach Discussion / Re: Index
« on: March 16, 2020, 08:30:38 AM »
The difference between 5.0V and 4.88V is small. The device should still work. What are the voltages you read when you rotate the shaft?

Check your wiring, is there a bad connection?

Is changing the power supply the only change you made? If you connected the output to the mill try disconnecting it when testing.

I can made better suggestions when I read what the voltages are.

General Mach Discussion / Re: Index
« on: March 14, 2020, 10:59:52 AM »
0.71V is right for when light is reflected by the target but 1.26V indicates too much light is is received during the off period.

The best solution is to increase the light to dark ratio. Here are some things to try.

Shield the sensor from room light. Does the 1.26V reading change?

Make what the sensor sees when the target is not in view less reflective. Try changing the angle to reduce specular reflection. See attached PDF

Increase the reflectivity of the target. Retro-reflective tape is much better than white paint.


If an optical solution cannot be found you can experiment with increasing the emitter resistor. Determine the resistance for two points, when the high value approaches 5V and when the low value starts to rise.
Assuming that with time dirt will reduce the light, you should select the lowest resistance that give full output.
The difference between the two points gives an indication how much dirt the system will tolerate before the lower voltage rises.

General Mach Discussion / Re: Index
« on: March 14, 2020, 08:51:56 AM »
Your diagram looks fine.

General Mach Discussion / Re: Index
« on: March 13, 2020, 06:01:59 PM »
Most digital cameras can see infrared so it is easy to see if the emitter is working.

Recheck your wiring, pinout diagram is on sheet 1

pin 1  output, 10K to  +5V  BROWN BLACK ORANGE
pin 2  ground
pin 3  LED emitter, 150 ohms to +5V  BROWN GREEN BROWN
pin 4 ground


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