Eurotherm 590+ DC drive OVER I TRIP

[ROAMER_AUS]

Hi everyone!!!

I have a problem with 590+. It powers up and does start up claibration OK. Health light comes on. But as soon the command is given to run, it shows OVER I TRIP on the display. It doesn't even turn on main input contactor. I have removed the drive, and powered it up with AUX supply only. No motor connected, just enable signal. Same thing, no matter local or remote control, OVER I TRIP as soon command is given.

Did anybody have a problem like this?

Thanks all!!!

 

[waross]

Blown output module?

--------------------
Ohm's law
Not just a good idea;
It's the LAW!

 

[ROAMER_AUS]

Could be, I didn't take the PCB apart yet. But how does it snse ovecurrent without the module even powered up?

 

[moa1]

This will indeed get you up and running. Autotune is a must for proper current calculations. Good luck

 

[itsmoked]

I would concur with waross' opinion. Every time that's happened to me on drives it's always been something fatal with the drive.

Don't waste too much time trying to repair it just get a replacement. Sounds like the drive you have you can still maybe read out the parameters. Read them all out and write them down. Move them into a replacement.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[RedSnake]

I made the assumption that when ROAMER_AUS wrote that he hade made the start up calibration that he meant that he had done the autotuning.
I sifted through the manual and found this.

https://www.parker.com/Literature/SSD Drives/DC Drives/HA466461U004.pdf

Under the headline Autotune Failed?

 A hardware fault relating to current feedback was detected on the control board.

and

OVER I TRIP
Current feedback value has exceeded 280% of rated current (300% loading not exceeding 15ms or 325% not exceeding 6.6ms is acceptable)
Motor armature windings failure - check insulation resistance.
Badly tuned current loop
Faulty Drive - refer to Parker Hannifin Manufacturing

I made a search for the phrase hardware fault in the manual and came across the text five times.

I am not sure that I have even bought a drive that needs to explain in the manual that the faults is because of a faulty boards or the drive.

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein

 

[ROAMER_AUS]

thanks for your replies all!!!

Yes, I am trying to repair the drive. I am aware that there is a hardware fault in it, just have to find it. Parameters I already extracted using Celite software.
I taught maybe somebody tried to repair this kind of drive before with these symptoms.
Autotune at this stage doesn't play any role from what I can see. I can't perform auto tune if the drive doesn't engage it's main power input. I have another faulty drive to be used for parts, and I have removesd another good one from the machine for measurements comparison if need be.
sourcing a new one is and option ofcourse, but timing is a problem. customer looked into ordering a new one, and lead times are just too long, didn't say how long.

 

[moa1]

My apologies to all. My mind tends to lean towards installation and start-up procedures when Drive/vfd issues are presented. Its a bad habit. Good luck

 

[ROAMER_AUS]

Fault is somewhere on the control card. bit more fiddly to find.........

 

[ROAMER_AUS]

Long shot here, does anybody have flash dumps from these processors by any chance....if it comes to that....

 

[ROAMER_AUS]

Gave up on the repair of the control board.
Managed to source blown up unit (power stage) and replaced control board. Copied the parameters. Machine is working fine.
Thank you all for the support.

 

[RedSnake]

Thanks for letting us know.
And good work.

“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein

 

[jraef]

If it’s not a shorted power device, then in my experience it’s usually a bad A to D chip on the current sense. In a past life with a mfr, we got a bad batch of A to D chips. They would heat up in the field and went full on, so reading a value of FFFF in hex (63,536 in decimal) equating to 10,000A of current, which, on a 200A device, was a big clue of it being false.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

 

[ROAMER_AUS]

Thanks for the tip jraef!!!
To be honest I'm a bit lost in chasing the signal between all the opamps, A/D converters, logic controllers etc. And all that without a schematic in
a multilayer PCB. Over here I was susspiciuous of D/A converter, but in this case reference signal is also out of limits. Plus I didn't know where digital signal is sourced from. A big mess where you get lost really easy. Worst thing in this case is that the drive doesn't actually measure Armature current. There is no shunt resistor or current transformer. It probably calculates it from input curent somehow. I still have 2 faulty drives with me.So if there are scehamtics available, I'd be more than thankfull !!!!