3 Axis CNC router

[JoeHarris]

In connecting the home proximity switches I have chosen the following method for connecting the cy cable shield to the star ground in the cabinet.

I have four core cy cable, one of which is green/yellow the other three black. The black ones I am using for the three prox cables, the green/yellow I have cut off but reused by twisting and soldering together with the shield fibres. I have then put some heat shrink around it and so have three wires to go to +24v, 0v and the CSMIO home input plus the green/yellow which runs to the star ground. Some pictures below to illustrate. I have done one so far, any comments before I do any more?!!?

[Neale]

I reckon that will be OK. I run my limit switches differently; one cable from the control box carries +24V and ground (along with something else I forget) and another carries all four limit/home switch connections (2 for X). I take the screens to the star ground. I haven't found any noise problems at all, which is the main concern, but as you are using 24V signalling rather than 5V as with many BOBs, you have a lot more intrinsic noise rejection anyway. Will you be able to run your stepper motor cables away from the signal cables? Having said which, again on my machine, the stepper motor cables, limit switch cables, and spindle motor cables all run through the same cable chains. They are all CY cable. I've tried to separate the motor cables from the others by putting the cooling water pipes between them, but again, no problems found with that setup.

[JoeHarris]

Do any CSMIO IPM users out there know whether the CAN Terminator supplied should be connected to the expansion module terminal if not used? If not, what is it for?!
also do the power supply pins 9 and 22 on the step/Dir connector need to be connect direct to +24v and 0v on the psu? So worried I'm going to fry this thing!



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[Neale]

Do any CSMIO IPM users out there know whether the CAN Terminator supplied should be connected to the expansion module terminal if not used? If not, what is it for?!
also do the power supply pins 9 and 22 on the step/Dir connector need to be connect direct to +24v and 0v on the psu? So worried I'm going to fry this thing!

I have to say that I can't even remember having a CAN terminator! I doubt that it is needed if you are not using CANbus, though. I think you need it if you use expansion modules. You can daisy-chain these modules together, each connecting to the next. The last one then needs a terminator for the CANbus to work properly.

Are you planning to use the digital outputs 0-3? If you are, then you need to connect 24V to the + and- as shown. If you are not using them, you don't need to connect power to those pins. As I remember, you use one of the relay outputs to switch the VFD and they don't need this extra PSU connection. You could use the digital outputs for things like switching coolant on/off, although personally I don't bother and use a manual switch.

[JoeHarris]

I have to say that I can't even remember having a CAN terminator! I doubt that it is needed if you are not using CANbus, though. I think you need it if you use expansion modules. You can daisy-chain these modules together, each connecting to the next. The last one then needs a terminator for the CANbus to work properly.

Are you planning to use the digital outputs 0-3? If you are, then you need to connect 24V to the + and- as shown. If you are not using them, you don't need to connect power to those pins. As I remember, you use one of the relay outputs to switch the VFD and they don't need this extra PSU connection. You could use the digital outputs for things like switching coolant on/off, although personally I don't bother and use a manual switch.

Brilliant thanks! Got all the UTP connections in now:

[JoeHarris]

I have to say that I can't even remember having a CAN terminator! I doubt that it is needed if you are not using CANbus, though. I think you need it if you use expansion modules. You can daisy-chain these modules together, each connecting to the next. The last one then needs a terminator for the CANbus to.

Would it do any harm to connect it? - just so I don't loose it!

[Neale]

No, don't think it would do any harm.

[m_c]

Plugging the terminator in shouldn't do any harm, either will leaving it off, as without any expansion modules, the CAN bus won't be doing much.

The purpose of it is to stop signals from reflecting/bouncing of the end of the CAN bus wiring, and causing interference.

[JoeHarris]

Thanks to the Legend that is Dean I got a stepper to move last night - woohoo!

[JoeHarris]

Hello all,

Bit of an explanation of my limit switch wiring and video of all axis now moving below:



https://www.youtube.com/user/joerharris