Losing steps/position, again

[ngwagwa]

JAZZ - yes the 5v to the BOB is fed from the vertcal 42 pin connector on the Baldor card. I think I would prefer to by a 5v transformer which should then make the Baldor redundant, just have to work out how to do the E-Stop.

I have found the BOB axis controls, they also feed into the 42 pin connector and am looking for the feeds from the board to the steppers (4 found and 2 to go)

[dazp1976]

JAZZ - yes the 5v to the BOB is fed from the vertcal 42 pin connector on the Baldor card. I think I would prefer to by a 5v transformer which should then make the Baldor redundant, just have to work out how to do the E-Stop.

I have found the BOB axis controls, they also feed into the 42 pin connector and am looking for the feeds from the board to the steppers (4 found and 2 to go)

These boards are usually wired as this below. Trace the wiring back just to double check it to be sure.

Shows 5v in on the bottom 3 right connectors. This is likely how it's powered atm.
e-stop P10, limits P12-15, spindle switch+speed all run off the seperate 24v input on the right.

Was at least 5 years ago when I was advised against using the bottom connectors for 5v. Told it's more ideal to modify a usb lead instead due to the protection circuitry.
Trying to re-find information on the net is a pig.

[JAZZCNC]

Was at least 5 years ago when I was advised against using the bottom connectors for 5v. Told it's more ideal to modify a usb lead instead due to the protection circuitry.
Trying to re-find information on the net is a pig.

Not sure I'd trust that information. I wouldn't trust USB for a CNC machine, not even to provide 5V as it's notorious for dropping out. The PSU would be protected by it's own circuitry and if the BOB as protection built into the USB connection which isn't on the 5v terminal then I'd take the risk for the sake of £5. I'd rather have it blow up than keep cutting out thru power dropouts while cutting, Only takes one job and you've lost far more than £5.

[dazp1976]

Not sure I'd trust that information. I wouldn't trust USB for a CNC machine, not even to provide 5V as it's notorious for dropping out. The PSU would be protected by it's own circuitry and if the BOB as protection built into the USB connection which isn't on the 5v terminal then I'd take the risk for the sake of £5. I'd rather have it blow up than keep cutting out thru power dropouts while cutting, Only takes one job and you've lost far more than £5.

It's worked so far taking 5v from a small switched psu into a usb cable. However. I might change it round now you've convinced me on it.
If I can make enough money I'll be swapping to an ess and get a new BoB rated for 200+khz asap for axis control anyway. My current board will go to run spindle/ limits/ estop etc. Well that's once I pluck up the courage to tackle the spindle wiring

[JAZZCNC]

JAZZ - yes the 5v to the BOB is fed from the vertcal 42 pin connector on the Baldor card. I think I would prefer to by a 5v transformer which should then make the Baldor redundant, just have to work out how to do the E-Stop.

I have found the BOB axis controls, they also feed into the 42 pin connector and am looking for the feeds from the board to the steppers (4 found and 2 to go)

That should be easy enough just follow wires to steppers. If there was a better picture of the original board i could probably tell you. There will be 4 wires per stepper. So look for blocks of 4wires that will probably be same colour wires.

The E-stop is easy enough and you have relays and contactors in there but first, you will need to find their voltages and what other things you need to control. I see what looks like a spindle Speed controller board so this will need to be incorporated into your wiring and safety etc.

To be honest, if you are going to start again with a new controller and drives then I suggest you trace wires and label them, then rip out everything else in the control box and start afresh. It's often quicker more reliable and less confusing.

If you inventory what you have and find the voltages etc and tell me what controller you are going to use I will happily help you work out a wiring schematic.

[ngwagwa]

To be honest, if you are going to start again with a new controller and drives then I suggest you trace wires and label them, then rip out everything else in the control box and start afresh. It's often quicker more reliable and less confusing.

If you inventory what you have and find the voltages etc and tell me what controller you are going to use I will happily help you work out a wiring schematic.

Ripping everything out sounds good to me but in the meantime while I get al the bits together I have taken up Doddys offer of a 36V power supply which I want to put on the Z axis to run the machine. I have foud four wires in the controller for the X Axis stepper but the stepper has 6 wires and they arent shown on the Denford wiring diagram for the umbilical connector from controller box to machine.

Here are pics of the 2 relays on the rail:

https://lozharroplures.co.uk/my_images/14.jpg
https://lozharroplures.co.uk/my_images/15.jpg

Much appreciate the offer of a wiring diagram.
I have been speaking to an old friend who is electrical savvy I can use two of the toroidal transformers that I linked to earlier in parallel to get 600Va.
I intend to use an AXBB-E motion controller and UCCNC and the drivers linked to earlier (unless you know any better options)
I have these transformers:
24V 3A
24V 14.6A
12V 2A
And there is an RFI Filter already fitted to the mains input

E-Stop will suffice on the big red button only.

Anything else you need let me know

[ngwagwa]

If you inventory what you have and find the voltages etc and tell me what controller you are going to use I will happily help you work out a wiring schematic.

Here is the list:

Existing items

Power supplies:
24V 3A
24V 14.6A
12V 2A
RFI Filter
Omron relay MK2P-S
Omron relay G2R-2-SN
Control Transformer" with outputs marked 28, 110, 120 and 240
DIN Rail
Fan (voltage unknown will check tomorrow)
Main on/Off switch


On order:

Airlink 500VA 230v to 2x45v toroidal transformer

Power supply 50W 5V DC 10A
bridge rectifier 400V 35A
4OFF Electrolytic Capacitor, 4700 µF, 100 VDC

ABXX-E Motion Controller

3-OFF Stepper Motor Driver 6.0A, 80V CNC Microstepping CW8060

Terminal Blocks and wires


I am pretty sure I can wire the ABXX to the drivers and steppers and the VFD is seperate so really all I need help with is getting the mains to the PSUs and on to the devices and the E-Stop.
I think I can work out the limit switches.
I thought it would be tidy to use the existing connectors on the rail to get my rectified output from the toroidal transformer the the drivers, I could have the wiring run behind my mounting board.

Obviously if I have missed anythng please let me know.

[JAZZCNC]

Do you have momentary Button on the machine that can be used for safety Reset. You really need this as part of the E-stop safety system.

[ngwagwa]

Do you have momentary Button on the machine that can be used for safety Reset. You really need this as part of the E-stop safety system.

I asume you mean the big red one on the front? If so then yes.

EDIT.
No that will be the E-Stop button won't it?

At the moment if I bend over and catch the E-stop with my backside I click on the Mach3 reset button to continue.

[JAZZCNC]

I asume you mean the big red one on the front? If so then yes.

EDIT.
No that will be the E-Stop button won't it?

At the moment if I bend over and catch the E-stop with my backside I click on the Mach3 reset button to continue.

Ermm probably not usually Big Red button is E-stop, show me a pic.