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Messages - MN300

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151
General Mach Discussion / Re: Chinese BOB with 2010 a funny one.
« on: August 13, 2020, 08:17:42 PM »
If your VFD has a 5V input option that would be a good choice. You can use the attenuation trimpot to set the DC-03 output to 5V when MACH is sending 100% PWM.

152
General Mach Discussion / Re: Chinese BOB with 2010 a funny one.
« on: August 13, 2020, 05:16:10 PM »
If I understand you correctly you are measuring 0 to 5V on digital output pins. This would be the result of sending a PWM signal to them. The DC-03 can be setup for PWM input so it should work. You will need a voltage source on the VFD side of the circuit to power the analog output.
Note the warning that a 10V supply will only give you a 9.5V output. I have worked around that by lying to the VFD about the the max speed. In this case you would set the max speed 5% high. 95% times 105% is about 100%.

https://www.homanndesigns.com/index.php?main_page=product_info&cPath=54_1&products_id=21&zenid=4jvu1rj9f8aoc5vi8buprlk0u7

153
General Mach Discussion / Re: Help need with a USB BSMCEO4U-PP Bitsensor
« on: August 12, 2020, 08:58:59 AM »
Disregard my earlier post, I had assumed BSMCEO4U-PP was the number of the touch plate.

https://www.machsupport.com/forum/index.php?topic=41002.0

154
General Mach Discussion / Re: Help need with a USB BSMCEO4U-PP Bitsensor
« on: August 12, 2020, 08:45:54 AM »
Maybe your breakout board requires a pull up resistor. It should measure 5 volts with nothing connected. What is the number of your board?

156
General Mach Discussion / Re: probing and z height zero issue.
« on: June 22, 2020, 09:51:06 PM »
The Probe-it manual shows how to use it with an active low input.
See Section 2.1.2   http://www.craftycnc.com/download/154/
A resistor value in the range of 1000 ohms should work. The maximum value depends on the pull up resistor in your BOB input.

157
Mach4 General Discussion / Re: PMDX-422 help please
« on: June 18, 2020, 12:12:26 PM »
You may be seeing stepper resonance - look it up online.
If you are testing with just a knob on the motor shaft be aware things will be much different when you connect it to the proper load.
You can attach a link to a video you place on YouTube or a similar site.

158
Mach4 General Discussion / Re: PMDX-422 help please
« on: June 18, 2020, 08:41:04 AM »
Here is a connection diagram for positive logic. ( not inverted )

Jumper set to GND.
Software set for STEP on even pins.
If you can assign an output for ENABLE the stepper motor current will be off when the drive is not enabled. Otherwise connect it to 5V.

If you are running the wiring a long distance the pair of wires from each drive input should be in shielded cable.

159
General Mach Discussion / Re: I need help with e-stop
« on: May 26, 2020, 08:54:34 AM »
Is wire #127 the correct number? It appears to be in the former limit switch circuit, not the E-Stop.

160
General Mach Discussion / Re: I need help with e-stop
« on: May 17, 2020, 11:31:28 AM »
The diagram you provided today helps some even though the smaller lettering is illegible. I am assuming the only function of the original controls you are using is the spindle motor.  If that's true everything from LINE 9A and below is not used and the E-stop contact on LINE 14A is free to be reused.

This leaves us with the physical aspect of the rewiring. From the photo of the machine it looks like it might be hard to string new wires to the E-stop switch. If you can locate the wires from J4 they would give you a way to connect to the E-stop switch from the main enclosure. They are 135, where it connects to CR1 and 3? (can't read it for sure maybe 37) where it connects to the negative rail of the DC supply. If you can find them disconnect them from the old circuit and verify they connect to the E-stop switch with your ohmmeter. They can be extended to the BOB input.

There is another possible problem. Those wires may be routed close to high voltage wires that could be a source of noise. A 0.1 uF capacitor across the input would probably be enough to filter the noise.

Because of the difficulties mentioned above it might be safer and easier for a novice like you to add a relay as mentioned in an earlier post.

Your next tasks are to remove FU11 and verify the machine still works as you want it to. Then examine the machine wiring and decide which approach seems best to you.

Another issue is if you want to switch the spindle on and off under MACH control.

Pictures of the inside of the control cabinet could be helpful.

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