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  1. Brian / Dean have I got this right?!

  2. #462
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 4-5 years. Has a total post count of 908. Received thanks 147 times, giving thanks to others 5 times.
    That looks fine. I've just had a quick look in the IP-M manual and that is all OK for X. Are you using master/slave on one axis? As I remember, channels 0, 1, 2 are used for X Master, Y, Z, and channel 3 for X slave.

    One small point to watch (and I only say this because I managed to get this wrong on my own machine) - be very careful to connect + to +, - to -, just as you have in your diagram. If you happen to swap the wires in the pair so you have + to -, - to +, nothing blows up and it all seems to work fine. However, if you have done this on the Step signal, then actually what happens is that every time you change direction on that axis, you lose a step. In my case, I managed to get the Z axis wrong. When you are just doing simple profile cuts, you don't see an issue. Then you start a complex 3D carving job and the cutter gradually goes deeper and deeper into the work. Best solution is not to get it wrong! However, if this does happen (and the IP-M manual tells you how to test this - p11/12 in my copy) you can either swap the wires so that they are correct, or change the step signal to be active low instead of active high. Not a big deal if you are aware of the possibility.

  3. Quote Originally Posted by Neale View Post
    That looks fine. I've just had a quick look in the IP-M manual and that is all OK for X. Are you using master/slave on one axis? As I remember, channels 0, 1, 2 are used for X Master, Y, Z, and channel 3 for X slave.

    One small point to watch (and I only say this because I managed to get this wrong on my own machine) - be very careful to connect + to +, - to -, just as you have in your diagram. If you happen to swap the wires in the pair so you have + to -, - to +, nothing blows up and it all seems to work fine. However, if you have done this on the Step signal, then actually what happens is that every time you change direction on that axis, you lose a step. In my case, I managed to get the Z axis wrong. When you are just doing simple profile cuts, you don't see an issue. Then you start a complex 3D carving job and the cutter gradually goes deeper and deeper into the work. Best solution is not to get it wrong! However, if this does happen (and the IP-M manual tells you how to test this - p11/12 in my copy) you can either swap the wires so that they are correct, or change the step signal to be active low instead of active high. Not a big deal if you are aware of the possibility.
    Thanks that is really useful: this diagram in the am882 manual confused the hell out of me:

    The (+) and (-) on the pulse and direction terminals relating to differential signals was also a revelation!!

    I'm only using three of the outputs on the ipm (0,1 and 2) as I am using one motor and a long belt for my x - axis.

    Really appreciate the help.

  4. #464
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 5 Hours Ago Has been a member for 4-5 years. Has a total post count of 908. Received thanks 147 times, giving thanks to others 5 times.
    Absolutely - the diagram is correct for most motion controllers/BOB's, and you could wire the IP-M that way, if you could interpret the over-complicated diagram. But the IP-M is much better wired the way you have it in your own sketch.

    Are you also going to use the alarm outputs from the AM882s?

  5. Quote Originally Posted by Neale View Post
    Absolutely - the diagram is correct for most motion controllers/BOB's, and you could wire the IP-M that way, if you could interpret the over-complicated diagram. But the IP-M is much better wired the way you have it in your own sketch.

    Are you also going to use the alarm outputs from the AM882s?
    Yes using the alarm outputs on the AM882s which I have wired + to +24v and - to pins 8, 9 and 10 of the ip-m's digital inputs. Have I got that right?

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