Discussion Category: FPLC – Fast Protein Liquid Chromatography
Repeating Error 2000
When I try to connect (via Ethernet, via 950 controller) I get this error repeatedly, via Unicorn 5.31, a few times each second. Controller lights all green. LAN working properly (send/receive numbers increasing). But no love. Anyone seen this?
Reply byHi Jim,
We call that a cascade error. Pretty common with Uninet. Most likely caused by a bad component, usually the mixer. Power off the system and bypass the mixer on Uninet 2. Power back up and see if the problem goes away. It could also be a valve. Use the same troubleshooting technique. Just be sure to power off when disconnecting Uninet cables. Although unlikely, it could also be an electronic failure on the CU.
--Cliff
Reply byCliff, thanks very much for this. Your response was very helpful. Unfortunately, it appears we have a broken mixer AND a bad controller. Here's why I think that. Please check my logic.
At first I was unable to get error 2000 to go away, even when I bypassed the mixer. I did it twice to confirm, but I was still feeling my way around the instrument and wasn't sure I'd done everything right. Still, I was thinking it might be the controller--so I managed to track down another CU-950 and stuck it in the system. With the system set up as usual (mixer not bypassed) and the substitute controller in the system, I still got the error. So: the error lies elsewhere; controller's probably fine, right?
So then, with the substitute controller in the system, I bypassed the mixer and the error went away. So--not sure what I did wrong at first, but clearly it's the mixer, right?
So then I stuck the original controller back in the system, with the mixer still bypassed--and error 2000 returned.
All thoughts welcomed. And Cliff, thanks again.
Jim
Reply byIt is unusual to see two failures together, but I think you are correct; CU and mixer. The mixer can be repaired but not the CU. That one you'll have to replace.
Reply byCliff,
You say the mixer can be repaired; GE is telling us it should be replaced. (They've been very helpful and responsive, but this, I suppose, is unsurprising.) I've found information online about replacing the motor. Is this the repair method you're referring to?
Thanks,
Jim
Reply byContact me at CWheatley@atgservice.com for more details.
Reply byReply bySolved changing he ethernet cable for Uninet2 connection (from pump module to mixer).