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Having issue with high DC buss voltage trip issues on start up. Also found have voltage on DC buss when the drive is not even commanded on. Buss does bleed down when power drive down. SCR checked out ok with meter. Removed J1-3 pluges off the the trigger board and still gets voltage to DC buss as soon as power drive back up. Anyone have any ideas?
Professional Member
a couple of questions...
you talk of several issues but only describe 1 check that is with your meter. have you measured the DC buss voltage with a meter? was the display accurate? what voltage drive do you have? what is the drive model number? what is the serial number? you are missing some information here. it may not seem important to you but it may be to us.
"Right" is not the same as "Wise".
Don't step on my favorite part of the Constitution just to point out your favorite part.
Just because you can measure it, doesn't mean it is important. Just because you can't measure it, doesn't mean it isn't important.
Professional Member
Not to mention that we should probably refrain from attempting to troubleshoot a VSD on an open forum.
Professional Member
York Vyper
VSD351-K-46
JQM-047
Yes, checked DC Buss with meter and voltage was prety accurate to what Opti-view was displaying. Newer development to add to scenerio is motor is meging zero meg-ohms to ground one one coil. Doesn't explain why we are getting voltage on DC buss when drive is not commanded on though. Will be having motor rewound and having heater installed through local motor shop and go from there.
Professional Member
Sorry for throwing my stuff out here on the site like that. I am kind of new here and don't quite know al the rules.
Professional Member
There is always DC voltage on the bus. When you get everything back together hook up your meter from ground to any of the three "T" legs (with the power off) and energize the disconnect. Make sure your meter and all leads are in a safe place. You will find that you have somewhere around 350 VDC. With the Vyper drive there is always DC voltage on the motor terminals when the machine isn't running.
Professional Member
Cool, thanks for the input, I'll check it out and let you guys know How it all turns outOriginally Posted by KnewYork
Professional Member
the only way to get a high buss value (assuming that everything is accurately measured) is to have high AC power, so check for that. on a 460 VAC nominal drive, high AC power is going to be around 509 VAC. you say that the buss goes high at start up...install a recording meter to the DC bus and start the chiller...a high buss voltage is about 745 VDC.
"Right" is not the same as "Wise".
Don't step on my favorite part of the Constitution just to point out your favorite part.
Just because you can measure it, doesn't mean it is important. Just because you can't measure it, doesn't mean it isn't important.
Professional Member*
“HARMONIC FILTER – HIGH DC BUS
VOLTAGE”
The Harmonic filter’s DC Link voltage is continuously
monitored and if the level exceeds 860VDC, this shutdown
is performed. The Harmonic Filter has its own
DC bus as part of the Filter power assembly, and this
DC Link is not connected in any way with the VSD’s
DC link. If this shutdown occurs, it will be necessary
to look at the level of 460VAC applied to the Harmonic
Filter. The specified voltage range is 414 to 508. If the
incoming voltage is in excess of 508, steps should be
taken to reduce the level to within specified limits. The
cause of this message is typically high line voltage or a
surge on the utility supply.
Just thought I would throw this out there.
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