power problems

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mickeyrench

Senior Member
Location
edison, n.j.
We have a 125hp motor for a pump that when we start it it causes havic to our vfd. When the 125hp is started for some strange reason it effects our vfd and the vfd trips out. We try to reset the inverter but it won't. We shut down the inverter and 20mins. later it will let us reset it. Each time it trips it takes longer for it to reset. Today it went out again and after 90 mins it still would not reset.
We cleaned and check all fuses and terminals. We have 2 other vfd's right next to the affected vfd and no problems to them. Any ideas anyone? please!
 
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charlietuna

Senior Member
You don't give us enough information to help you--what does the vsd control--this pump or other equipment? the fact that a drive is requiring more time to reset does not make sense? I would contact the manufacturer and let them walk you thru the installed perameters or setpoints.
 
Strahan

Strahan

Senior Member
Location
Watsontown, PA
1. What type of VFD?
2. What is the fault on the drive?
Next I find it very strange that it takes the drive being off for an extended amount of time in order for the fault to reset. As soon as the drive is powered down completly and then brought back up the fault should be gone. My only thought would be if the drive is over heated then you would get an overtemp fault in that case I would understand the fault being there for lengths of time. Are the other two unaffected drives on the same supply and if so are they of the same make? Are the load wires from this VFD strickly going to one pump motor meaning are they seperate from the pump motor causing havoc? Get us some more info and maybe we can help.
If the supply is common for all these drives and only one is being affected I would compare the age of the drives but other than that I wouldn't feel the problem is on the line side I would tend to think its more of a load side issue. Maybe some type of regeneration or noise occurance. Strickly all assumptions until you get us some more info. I'm leaving for a little while I'll try and check in over the weekend. Good luck.
 
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mickeyrench

Senior Member
Location
edison, n.j.
3 phase 480v vfd for 75 hp motor. mitsubishi vfd z240 only trips when 125hp motor from a differrent mcc panel is started with only 30 volt drop at line side of the vfd. 482 to 459volts. this happen with vfd 's motor running or vfd's at idle withpower on vfd. There is 2 other identical vfds right next to this vfd without anything effecting them. Thats about all i can add to it. Thanks for you help. ...........................................................................................................................................................................................................................................................................................................................................................................
 
GUNNING

GUNNING

Senior Member
Location
Gainesville, Florida
Trouble shoot then call the 800 #

Trouble shoot then call the 800 #

If a motor not connected with the VFD is shutting down when the 125HP motor turns on I would go back to basics. Look for a miss wire / loose wire or a draw down on voltage or incompatible equipment. This could mean the transformer supplying the service isn't big enough to handle the draw down or the neutral is sized inappropriately. Then look at the programing on the VFD (with fresh eyes). Look at the board on the VFD got any burn marks? carbon tracking? blown open caps? Are there jumpers somewhere that say 208 240? Basics.
 
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Goroon

Member
Hope this helps

Hope this helps

We just had a GE FuJi Drive with a History of issues have similar problems. Error was reported as ?FU5?[not in book]. When I caught it the actual error was ?FUS?[in book]. Code is for main DC Bus fuse open, ?Not a re-settable error, Replace DC Buss fuse.? When I found that this had been being reset I was curious and contacted factory, they indicated looking for loose board sensor wiring, bad crimps ect?
What I found was the DC Buss bars where loose. The only contact was assembly pressure at key points. Also found that the 400 A Semiconductor DC Buss fuse was open in One Direction and this I still do not understand.
 
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