Laser 4000 intermittent stopping

[Don B.]

I’ve got an older laser 4000 about every 50th vehicle or so it will stop at the corner of the vehicle to turn and it will make its turn and just keep spraying and not move. And it’s random corners, and on random cycles. It could be the pre-soak, high-pressure or spot free rinse. It will stop and make its turn and just stay motionless and keep spraying product for about 30 seconds and then suddenly shut off. Like I say, it’s random and intermittent, had been able to figure it out. Also , the controller does not throw out any fault codes. Wondering if anybody else ever ran into that on a laser 4000.

 

[Eugene]

Mid limit proc sensor

 

[Don B.]

Mid limit proc sensor

I actually thought about that mid limit sensor. I didn’t know if that would cause that or not but maybe it is. I’ll replace it and check the wiring and flag plate it and see if that helps it. Thanks.

 

[Waxman]

definitely sounds like a Prox switch to me. You just have to figure out which one is losing the signal at that particular point where it stops. I'm not familiar with the laser wash, but on my old machine there was an LED light in the PLC that corresponded to the different Prox switches. If there is one corresponding to the prox in question you have to see if it's lit or not on the wash stops.

 

[Jsobi]

Tighten all the screws in J0. Especially the input and output cards. Dont forget the speed controller screws.

 

[PEI]

When it happens, what does the print out say? What does the J0 say when you input 100#1#?

 

[Don B.]

definitely sounds like a Prox switch to me. You just have to figure out which one is losing the signal at that particular point where it stops. I'm not familiar with the laser wash, but on my old machine there was an LED light in the PLC that corresponded to the different Prox switches. If there is one corresponding to the prox in question you have to see if it's lit or not on the wash stops.

Yes, there is indicator lights for the switches.
I’ll check that next time it happens.
Thanks

 

[Don B.]

When it happens, what does the print out say? What does the J0 say when you input 100#1#?

My printer is not working. I’ll check the status,100#1#, next time it happens.
Thanks

 

[Don B.]

Tighten all the screws in J0. Especially the input and output cards. Dont forget the speed controller screws.

I’ll check those out.
Thanks

 

[PEI]

You mentioned that it happens at different corners. Does it just happen at the front driver's side and rear passenger's side or does it also happen at the rear driver's side and front passenger's side?

I ask because if it just happens at the front driver's side and rear passenger's side then you are most likely looking at a bridge motor/gearbox problem. If it's just happening at the front passenger's side and rear driver's side, then it most likely has to do with the trolley motor/gearbox. If it's truly happening at all four then you might want to check the impact switch, system stop relay or the VFD.

 

[Don B.]

You mentioned that it happens at different corners. Does it just happen at the front driver's side and rear passenger's side or does it also happen at the rear driver's side and front passenger's side?

I ask because if it just happens at the front driver's side and rear passenger's side then you are most likely looking at a bridge motor/gearbox problem. If it's just happening at the front passenger's side and rear driver's side, then it most likely has to do with the trolley motor/gearbox. If it's truly happening at all four then you might want to check the impact switch, system stop relay or the VFD.

Honestly, at one time or another it has happened at all four corners. In fact, it used to do it about once every six months. I’d reset it and it was fine again for six months. So I didn’t look into it too hard. But now it’s doing it more often, although it hasn’t done it since I made this post so I haven’t been able to check some these things yet. That’s a lot of good suggestions. I’ll troubleshoot these things. Thanks.