Discussion:
Hyster E50XM

I have a issue where the forklift quit driving when the driver made a quick shift from reverse to forward. Code 71 and 44 came up.

Diagnosed and Action:
Forward and reverse relay will not closed. All fuses were checked and relays were verified working by jump test. The diodes were removed and tested good. The drive motors spinned when the 1A, Regen and direction relay were jumped. I had replaced the all the SCR and capacitor with no luck. I want to replace the controller but hesitate because I not that familiar with Hyster machine. This is our first electric forklift as well. I do know all inputs to the to the card are correct based on the service manual reference. However, it seem the outputs to the relay ground is missing. Do the controller usually go bad? Thank you in advance
  • Posted 13 Nov 2010 05:52
  • By fluke98
  • joined 11 Aug'06 - 10 messages
  • New York, United States
Showing items 1 - 5 of 5 results.
Error code 71 current sensor regenerative braking PA4 and PA5 jumper test in stop traction
Error 44 : Check components and wires: SCR2, SCR5 and suppressors... Check inductor 0 ohms aprox in SCR2 line.

After all:

SCR1 TEST IN ISOLADE CIRCUIT
  • Posted 16 Feb 2011 08:52
  • By edel38
  • joined 14 Jun'09 - 1 message
  • Paita, Peru
FIXED!!! Bad Controller Card and thermal protector out of range 75 ohm @ 65F.

I realized all inputs signals were good, all SCR tested good no short, diodes ohm tested within range with a VOM, scrubber good verified by VOM.

Thanks to everyone who had responded.
  • Posted 27 Nov 2010 09:00
  • By fluke98
  • joined 11 Aug'06 - 10 messages
  • New York, United States
Edward,

How do you properly check the SCR 2 and 5? I did an ohm test and had reading like 52M ohm on average. I measured the positive, negative and at the gate. Are these good reading?
  • Posted 14 Nov 2010 09:56
  • By fluke98
  • joined 11 Aug'06 - 10 messages
  • New York, United States
Edward

Thanks, I will tackle it with your suggestions. Nice looking pet you got there. I am looking for a puppy if you got any.
  • Posted 14 Nov 2010 00:16
  • By fluke98
  • joined 11 Aug'06 - 10 messages
  • New York, United States
I posted this same reply to this same question in another thread (267)
if by the "outputs to the relay ground is missing" you actually mean that the circuit to battery negative is open in the control circuit that pulls in one or the other directional contactors, this is the correct (default) action from the controller because some of the functions have not happened that are required to drive. it is not correct to consider "ground" [as in an automotive chassis negative ground] and I much prefer to use the term negative leg of the circuit.
in an ev 100, code 44 indicates that 1 rec did not properly turn off, so a bad 2 , 5 rec, 22 snubber, or bad 1 rec, or some other input at t2 that is causing a high postive voltage potential at t2 that does not drain when rec5 "looks ahead".
code 71 says incorrect inputs from regen current sensor. check for continuity on the green lead that goes from the current sensor on the regen contactor's heat sink to A plug (outside of the smaller 2 plugs) on the logics card.
my instant WAG would be that you may have reinstalled one or more of the SCRs incorrectly.
  • Posted 14 Nov 2010 00:03
  • Modified 14 Nov 2010 00:06 by poster
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
"it's not rocket surgery"

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