Hyster E30B:
Safety shutdown/lockout

I have old hyster which i believe to be an E30b but plate has been removed. have had a lot of problems and repair company have fitted new EV-1 controller but now it is only possible to operate at very slow speed forward or reverse. As soon as motor is subjected to a load then it appears to go to full speed i.e the trucks jerks forward or back, and then lockout cuts in and drive stops. This happens with wheels off ground if brake is applied and pedal is pressed. 1A contactor has been disabled. Repair man is baffled and doesn't know what to check next.
Any suggestions?
  • Posted 26 May 2008 02:10
  • Discussion started by rolo
  • Suffolk, United Kingdom
Showing items 1 - 4 of 4 results.
it is possible but not trivial to check each SCR and diode. first you should be positive your battery is in good shape, as battery problems can show the same symptoms.
The tech will need a tool called a "flightsystems handyman" (flight systems is a company that first made these testers available to the forklift industry).
You may save a lot of time and money getting the entire chopper panel removed (be sure to mark the 6 heavy cables as you remove them) and send the entire chopper panel to a re-builder like flight systems.
  • Posted 29 Jun 2009 20:21
  • Modified 29 Jun 2009 20:27 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"
I have been using the truck as it does what I need it for albeit slowly. I have had new forklift engineer out to it and he has replaced pedal switch but says that it is one of the three SCRs breaking down. Is there any way of find out which one is at fault as he has checked with his meter and they are OK but one is breaking down under load. Can this be simulated in any way or do they have to be replaced in turn until faulty one is found?

Thanks for your help
  • Posted 29 Jun 2009 19:49
  • Reply by rolo
  • Suffolk, United Kingdom
of course since this problem was posted in May 08, and it's now October 08, I hope you haven't left this unit in the corner and burried it under other trash.
The first thing _I_ would check is the repair company's phone number is in the waste bin, and then check the yellow pages to find someone that has a clue to repair your (not new) unit.
This is not easy to guess about this problem, it could be related to the chopper controller or the accel pedal and it's switches. it does sound as if it is getting what we call a "pulse monitor trip", where the rectifiers are not correctly pulsing, one of the 3 major SCRs (silicon controlled rectifiers) or the related large diodes is shorted closed. but on this old of a unit, this could even be caused by a low battery charge.
  • Posted 14 Oct 2008 20:41
  • Modified 14 Oct 2008 20:45 by poster
  • Reply by edward_t
  • South Carolina, United States
Yea, First thing I would check is #1 SCR or called REC, Should read at least 50000 omhs of resistance between cathode and anode, Upon initial acceleration the card will check for shorts ,if the #1 scr fails to shutoff the truck will jerk excessivly and the card will detect and shut off traction circuit.could also be an associated #2 rec
  • Posted 14 Oct 2008 12:29
  • Reply by SirWorkalot
  • Tennessee, United States

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