Strange slow fail on my Modular - Page 3
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  1. #41
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    That is the Field side of the control and what happened is correct.

  2. #42
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    So I should disconnect P3B? Point 22 or 27?

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    Quote Originally Posted by Drstrangelove View Post
    So I should disconnect P3B? Point 22 or 27?
    Try just 27.

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    Ok so while you were responding I did 22 and when I put it in fwd it accelerated to about 2000 rpm the slowly decelerated to 1000. Speed was controllable above half speed on the knob as expected. Would not go to full 4K 4pm but definitely controllable on the upper half of the scale.

  5. #45
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    Disconnecting 27 caused the main contactor to not engage at all.

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    Quote Originally Posted by Drstrangelove View Post
    Ok so while you were responding I did 22 and when I put it in fwd it accelerated to about 2000 rpm the slowly decelerated to 1000. Speed was controllable above half speed on the knob as expected. Would not go to full 4K 4pm but definitely controllable on the upper half of the scale.
    What was your reference voltage when you did this????

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    Are you measuring your reverence voltage at 31 and 32?

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    Still drops to 55VDC then as machine decelerates down to 53ish.

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    Quote Originally Posted by labeeman View Post
    Are you measuring your reverence voltage at 31 and 32?
    Yes that's where I'm measuring.

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    I only want you to disconnect the wire coming from the pot #27 it should not cause the machine to not power up unless you are disconnecting other wires.

  11. #51
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    Ok, this time with 27 disconnected it and placing it in fwd it immediately spun to about 1600 rpm. No speed control until about half speed on the knob and was fully controllable to 4K rpm. Reference voltage was 55.

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    You have a problem with your reference voltage there is NOTHING t load it down with the wiper of the speed pot disconnected The only thing that I see that can do that is the primary of T4 is not 120 VAC when in gear or a chip shorting something out and only loading it down when in gear You need to make sure that #1 and #2 are 120AC when in gear and out of gear. The diodes are on the module and there are 4 of them until you fix the reference circuit the speed knob will not work right. The field weakening is working right and the motor is working right.

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  14. #53
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    Found a failed diode in the reference circuit bridge. I had checked them once but doing it a second time found one that was leaking the wrong way. When I connected the oscope to 31/32 the waveform was a little strange, should have picked up on that. It's back at the shop so I can't check it now but I'll grab it nxt time I'm there and see.

    Replaced and fully operational.

    Thanks for walking me through this, I learned a lot, wrote it down in my manual too!!

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  16. #54
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    If They are original I would change all of them.

  17. #55
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    Yep, I made little brass holders and have a couple bags of diodes to fit. That's for tomorrow. That particular one wasn't original but several are.

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