Crown RR3000:
no travel EV100

Hello all I have a crown RR3000 with a EV100 card number 1C3645LXC01. The truck is a no travel in either direction and no code displayed. The contactors don't pull in. The operator presence swithces are all working properly as are the directional switches and the travel pot is adjusted correctly as well. I am getting correct voltage to the positive side of the contactor but not receiving a negative from the card. However, when I disconnect the negative side of the coil (wire coming from the card) it shows an error code 23. If the card had gone bad would it display a code, or could this be the cause of my problem?

thanks in advance for your suggestions.
  • Posted 21 Jan 2011 00:03
  • Discussion started by t_montez
  • California, United States
Showing items 1 - 4 of 4 results.
Monitor the voltage at TB11-5 and TB11-6 while under a load. The (2) two brake switches (one underneath the floorboard and the other on the drive motor brake asm bracket) will show good voltage with no load and will show a voltage drop under-a-load,if one or both are bad.
  • Posted 23 Jan 2011 04:58
  • Reply by Truck_Tech
  • United States
Went back to the customer yesterday and did some more troubleshooting, as I am always reluctant to replace the oscillator card since the are very rarely the problem.

Upon further investigation I found that the contactor was indeed getting a negative from the boards, but the positive from the driver board was on occasion dropping out and or not carrying appropriate amperage to pull the contactor in. I jumped across the board (direct from the brake switch input to the contactor output) and bingo the truck started working.

This isn't the first time I have had this type of problem with one of these driver boards.

And correct when attempting to operate the truck the display was showing a blank screen as if the truck should be operating.
  • Posted 21 Jan 2011 23:27
  • Reply by t_montez
  • California, United States
I would never say that the card is "for sure good", based on this test procedure, but I would think it proves the display is able to see and display an error code when 1 is active, so then it means there must be some other strange problem, since the card should also display some code, any time it does not run, and if it does run, it should then output the current battery state of charge to the same display.
what does the display say as you try to drive, just blank? (have you turned the key to the "start" position, some crowns have a rely that the start position pulls in?)
does the display show the sequence for the reach selector?
  • Posted 21 Jan 2011 10:39
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"
Correction 1C3645LXCD1
  • Posted 21 Jan 2011 00:19
  • Reply by t_montez
  • California, United States

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