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  1. #1
    Some help would be most appreciated.
    I have an Eding CPU5A4E controller and Siemens G110 VFD.

    Specific factory settings for the analogue version
    Digital input Terminals Parameter Function Active
    Command source 3, 4, 5 Digital input
    Set point source 9 Analogue input
    Digital input 0 3 ON / OFF1 (I/O)
    Digital input 1 4 Reverse
    Digital input 2 5

    I think I connect pin 17 on the CPU5A4E to ADC1 on the G110
    Pin 25 on the CPU5A4E to connection 10 (0v) on the G110

    Pin 20-21 (+5v) and Pin 1 on the CPU5A4E to connection 3 (Din0) and 6 (+24v) on the G110
    I was going to use a solid state relay just in case I mess up and send 24volts to the cpu (not good).

    Anyone know if what I am proposing is correct?

    25: GND
    24: GND
    23: GND
    22: GND
    21: +5V (Solder jumper)
    20: +5V (Solder jumper)
    18: PROBE
    17: PWM or 0..10V (JUMPER)
    15: IN HOME4
    14: OUT FLOOD
    13: IN HOME1
    12: IN HOME2
    11: IN ESTOP
    10: IN HOME3
    9: OUT STEP4
    8: OUT DIR4
    7: OUT STEP3
    6: OUT DIR3
    5: OUT STEP2
    4: OUT DIR2
    3: OUT STEP1
    2: OUT DIR1
    1: OUT TOOL

    Pin out on the CPU5A4E.
    Many thanks

  2. #2
    First thing is you don't want to connect any voltage on the CPU to voltage on the vfd. Also I don't have any info on the CPU5A4E.

    If you selected pin17 on the CPU to be 0-10v using the jumper, then as you say connect that to vfd pin 9 (ADC1+)
    Connect CPU pin 25 to vfd pin 10 (0V). The only thing to watch here is, have you used the correct GND terminal on the CPU. Sometimes a particular 0V is associated with the 0-10v, output so just check that.

    This is the tricky part now. Normally the inputs to vfd terminals 3,4,5 are supplied by external relays, but I can't see another terminal associated with OUT TOOL terminal 1 of the CPU to act as a pair of relay contacts.
    Without further info about the CPU5A4E I can't advise anything more.

    Here's a picture of the vfd connections.

    Click image for larger version. 

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    Last edited by EddyCurrent; 04-02-2015 at 12:52 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  3. #3
    You can connect the cpu directly to the vfd. If you go onto Berts Eding cnc website and look at the cpu5a flyer, the link is at the bottom of the page, it shows the possible connections.
    If you are really stuck then email Bert and he will help you out.

  4. #4
    Now I see why you mentioned the solid state relay. Personally I would not be connecting the TOOL output directly to the vfd, I would attach a relay between TOOL and GND on the CPU (looks like you would need an external 24V supply), then I would connect the Normally Open contacts of that relay between vfd terminals 6 and 3 (then the vfd would have to be configured by it's firmware so that the input meant RUN FORWARD.
    The main reason for using a relay, and it's the same with PLC outputs, is that it's easier and cheaper to change a knackered relay than it is to replace a knackered controller or PLC, etc. Volt Free contacts as they are called is the way to go for me. For similar reasons I would not be using the 24V supply from the vfd to drive a relay, it only supplies 50mA max.
    Last edited by EddyCurrent; 04-02-2015 at 06:15 PM.
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  5. #5
    Hi all,

    Sorry for the late reply, been working.
    I have attached the layout that I think I may go with.

    The external 24v supply seems like a good idea.
    I have already added a 5v supply for the cpu5 board.

    Thanks for the help.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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