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Thread: Hurco BMC20 Dynomotion Retrofit

  1. #85
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    You did things differently than I intended. I didn't intend to have a voltage divider. Just a single 150ohm load. And I expected to read the voltage at the output.

    But that is ok. If I understand what you did.

    You call out "V-GND" and "Powersupply GROUND". Are those the same thing?

    Where is the scope GND connected?

    I think the output might be driving 24V (with a 24V supply) through a 2K Resistor (as seen on the PCB marked 202 - 20 and add 2 zeros). In that case we would expect to have at your scope connection:

    24V x 150ohms / (150ohms + 150ohms + 2000ohms) = 1.56V

    Did you mean to say 1.5V or 1.05V ?

    Regards

    TK
    http://dynomotion.com


  2. #86
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Yes V-GND and Powersupply GROUND are the same.

    Scope GND is not connected. Did not know where to connect it. I have not used a scope much so my understanding of one is low.

    1.05V channel output with 100ohm voltage divider.

    If i use a resistance of 155 ohms to gnd. I get an output of 1.71 Volts and when output toggle off, voltage reads 74.1 mV.

    Troy

    Last edited by Need TECH Help!; 04-17-2017 at 09:03 PM.
    http://www.homecncstuff.elementfx.com/


  3. #87
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    You should connect the Scope Probe GND to the GND of whatever you are measuring. In this case V-GND.

    Note some scopes have a connection from their GND to Earth GND. (which is why it may be working without any GND). I usually disconnect that using a GND isolation Plug on the scope. You might want to determine if your scope has a connection to Earth GND by using an Ohm meter. Its nice to know.

    Is your 24V supply isolated from Earth GND?

    But anyway that seems to make sense now with 100 ohm resistors:

    24V x 100ohms / (100ohms + 100ohms + 2000ohms) = 1.09V (close enough)

    I think we now need to decide where to connect it to KFLOP/Kanalog/Konnect. The main decision is whether it needs to be connected to a hardware encoder input or software encoder input. Hardware is good because it can handle high speed counting up to 1MHz. But has the disadvantage of limited pins, voltages, etc... Software is good because any inputs can be used. But has the disadvantage of a max count rate of ~3KHz. That is usually adequate for most MPGs. I'd suggest trying Software first because it is easy and if there are any issues with spinning the MPG fast figure out a hardware solution.

    Since Konnect has screw terminals and can accept 24V signals I'd try that. Connect a Konnect Common to V-GND and the A B signals directly to the Konnect Inputs. Konnect Inputs are like a 4K Ohm load so they should be driven to:

    24V x 4K / (2K+4K) = 16V

    Regards

    TK
    http://dynomotion.com


  4. #88
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Yes, scope has connection to earth ground.
    Benchtop power supply is not isolated from Earth Ground. Shows about .8 ohms.

    Will do on connecting to Konnect. It will be a while before i get to test it out.Still need to make cable for pendant. And finish wiring diagrams, I have about 90% of my wiring diagrams done for mill. Next to sort out is the VFD Rs485 to Rs232 RedLion converter so i can interface to Kanalog.

    Thanks again for help and patience

    Troy

    http://www.homecncstuff.elementfx.com/


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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Working on VFD to Kanalog connection. Making the RS232 cabling for RS485 converter . The converter iam using is a RedLion ICM5. The converter has dip switches to set it as a DTE or DCE device. Am i understanding correctly that it should be set as a DTE device and Kanalog JP10 is the DCE device?

    Troy

    Attached Thumbnails Attached Thumbnails Hurco BMC20 Dynomotion Retrofit-red-lion-rs232tors485-pdf  
    http://www.homecncstuff.elementfx.com/


  6. #90
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    That sounds correct to me. The normal idea with RS232 is to have one device talk (TX) to pin 2 and one device listen (RX) to pin 2. But the other piece of the puzzle is how the cables are made.

    Regards

    TK
    http://dynomotion.com


  7. #91
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Here is an xls sheet of my cable connection for RS232. Not sure about sheild drain thow. I show it being connected to GND pin at Kanalog JP10. The manual of Kanalog show shields on pins 7 & 8, but where is this as JP10 is only 6 pins?
    Troy

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  8. #92
    Gold Member TomKerekes's Avatar
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    Default Re: Hurco BMC20 Dynomotion Retrofit

    Hi Troy,

    Pin 1 is also Kanalog GND which might be used for the shield.

    Regards

    TK
    http://dynomotion.com


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