WEG GTA250MI33 Genset Over Voltage

Unless someone on CR4 happens to have an operator's manual for this genset, the best place to ask would be WEG and/or John Deere. Provide name, rank and serial number.

Did it work properly in the past? Or is this a new set-up?? Because if you made a wrong polarity CT connection to AVR, you would get the opposite of voltage droop with increasing lagging load (and if you used a CT from the wrong phase, you would get strange behaviour). If the set is isolated from mains and other sets, droop is not essential - you could try shorting out the secondary (AVR side) of the phase CT that biases the voltage signal to the AVR.

Unfortunately I do not know if this problem existed in the past. This genset was installed by the owner as a standby unit. When he bought the pelleting plant form us we had to use the generator to power some of our machines because the utility power is limeted to only 250kVa. The problem showed up during the commisionning of our pelleting equipment when we measured the voltage increase and low power factor.

I have been trying to get the WEG agent in that ariea to visit the site and check/repair the problem, but it has been 3 weeks now and NOTHING. He did ask that we bring the complete genset to his workshop where he can run it on a load bank, but the time involved makes that impossable right now, mid season. It is not as if my client is not willing to pay for services and parts.

As the plant is currently running I am at great risk tah the PLC's and other sensative switchgear may burn out. We are allredy experiencing trips on the soft starters and on some GB's.

Load banks are much more easily transported than are gensets. The problem might be simpler than that, anyway. I'm surprised at their lack of cooperation, to say nothing of common sense. If they want to play like that, we know a company to avoid; too bad you might be stuck for a while.