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  1. #1
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    Discharging York vsd -time not discharging

    Had to replace bleed resistor 1 or 2 on a yciv vsd. I waited and waited and eventually DC bus dropped to around 20 something vdc. Figured that was save. I had waited over a half hour for it to safely discharge. Not sure what happened but my socket accidently shorted to the top copper bus and KAPOW!!! littetally arc welded my socket to bus- so how do you safely discharge the DC bus when time isn't discharging and the a bleed resistor has failed.? Would rather not have to go through that again
    "It's just like it doesn't work. I mean it seems to be ok now, but it usually like never works"

    "Never an always and always a maybe"

  2. #2
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    There is a way but I won't say in open forum .
    Always check with a meter for both AC and DC voltage. Sometimes you have to walk away for overnight.


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  3. #3
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    This is why I'm asking for an insulated socket/ratchet set. Doing PMs on drives I like to check the lugs. When I can I wait but never more than 20-30 mins, sometimes the drive has to be shutdown as little as possible. If it can't be down that long, I note it and it doesn't get done. Of course I check with a meter but accidents happen.

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  5. #4
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    JCI part number 031 00733 000 is a discharge probe for just this purpose....be forewarned...it is a bit pricey. there isn't much to it, i suspect the lawyers and insurance company made it this expensive. you can easily make a rudimentary one yourself.

  6. #5
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    Quote Originally Posted by dave1234 View Post
    Had to replace bleed resistor 1 or 2 on a yciv vsd. I waited and waited and eventually DC bus dropped to around 20 something vdc. Figured that was save. I had waited over a half hour for it to safely discharge. Not sure what happened but my socket accidently shorted to the top copper bus and KAPOW!!! littetally arc welded my socket to bus- so how do you safely discharge the DC bus when time isn't discharging and the a bleed resistor has failed.? Would rather not have to go through that again
    I make it a rule I always check power on everything before doing anything and use 2 different meters in most cases.

  7. #6
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    Quote Originally Posted by jayguy View Post
    JCI part number 031 00733 000 is a discharge probe for just this purpose....be forewarned...it is a bit pricey. there isn't much to it, i suspect the lawyers and insurance company made it this expensive. you can easily make a rudimentary one yourself.
    A bit pricey , $2500! There are other ways that work.
    Was helping one of our techs in west Texas about ten years ago with a TM 3 that would not discharge. He used a discharge stick but did not call back for a few hours. I got worried and called him to see if he was ok. First words out of his mouth " YOU DIDN'T SAY HOW LOUD IT WOULD BE , I HAD TO CHANGE MY SHORTS". I guess he thought it was going to be like turning off a light switch.

  8. #7
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    Thread Starter
    Eye ye ye. So I'm not the only one. I absolutely checked both ac and DC- I said that in the original post ... When it was around 20 something I figured it was safe. But I was checking each pole to and the bus to ground and the plug on the logic board. What the hell did I do wrong?? Luckily I was using a cheap 1/4" drive retchet with a stubby plastic this insulated handle- welded the socket right to the bus bar- there's no way >30vdc could've done that. I waited a good half hour 45 minutes before digging in. Yes I to could've used another pair of pants. Just beutiful did I mention it was a data center were even though they have another chiller one down is a dyer emergency... However not as big of an emergency as blowing my arm off. So what's the make shift option?? Machine says less then >30vdc 300 Sec my a$$ apparently but I did check just not sure what I missed!!

  9. #8
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    Thread Starter
    Quote Originally Posted by jayguy View Post
    JCI part number 031 00733 000 is a discharge probe for just this purpose....be forewarned...it is a bit pricey. there isn't much to it, i suspect the lawyers and insurance company made it this expensive. you can easily make a rudimentary one yourself.
    Trying to google that part number but not common up with anything- what is it like meter leads with a large power resistor across it or something? Yeah I could probably make one for less then $2500. Funny thing is all these company's preach safety first then scoff and through fits because they simply don't understand letting something sit over night especially in this case- don't think the self appointed safety gurus understand what it means to let a 200+ HP drive discharge overnight.
    "It's just like it doesn't work. I mean it seems to be ok now, but it usually like never works"

    "Never an always and always a maybe"

  10. #9
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    Yeah it's funny that they don't have a answer on how to do it safely but they can tell you to do it safely or get fired.
    The stick is like a pulling pole that you use for pulling 4160 v fuses. Fiberglass pole and some clamps. It's actually a real safe way to discharge the pole assy.


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  11. #10
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    Quote Originally Posted by Chev5372 View Post
    A bit pricey , $2500!...
    I forewarned you!

  12. #11
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    Quote Originally Posted by jayguy View Post
    I forewarned you!
    Jay, is that the same discharge probe used on TM-1? A black plastic probe with four or five led lights?
    Maybe I need to offer the one I have for sale.

  13. #12
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    Quote Originally Posted by KnewYork View Post
    Jay, is that the same discharge probe used on TM-1? A black plastic probe with four or five led lights?
    Maybe I need to offer the one I have for sale.
    That's what it looks like. We are supposed to have one floating around the shop somewhere, but I haven't seen it personally.

  14. #13
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    Jay and KnewYork if had LEDs on it it is someone's truck and used as a light saber. May the forc...... O What ever!


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