Hi,
We have an electric Yale lift that keeps shutting down the drive. It will drive fine in both forward and reverse for the first 10 or 15 minutes of use, but after that it will shut off the drive (with the lift moving under power--it makes a "click" sound and then the truck coasts to a stop). When it makes the "click", code -07 pops up and the maintenance icon lights up. For a few minutes, it is sometimes possible to put the truck in neutral, then back into drive, and keep going for a few seconds at a time. But that's getting desperate.
If we wait, say, 5 minutes, and then try again, it will go for a couple minutes, but then the process starts again.
All this points to some kind of overheating issue (to my uninformed mind). But I have no idea where or why, or what a code -07 means.
Any help would be much appreciated!
Showing items 1 - 6 of 6 results.
Adjust your potentiometer, code 7 will appear if pot is not lined up when start switch is activated
what edward says is right on the money
this is most likely a battery issue or a faulty connection in the control circuit.
I do need to ask though, does the dash display have any buttons on it? a green and yellow button or possibly a row of buttons across the bottom of the display? You can push one of those buttons while the key is turned off and it will display any fault codes stored in the controller starting with the most recent one first and it can store up to 16 codes for drive and also for hydraulic if it has a scr controller on the pump motor too.
As far as those 4 digit numbers you are seeing, they are drive hours and pump motor hours displaying when the system powers off.
If it is showing those every time the code -07 happens this is telling me the truck is loosing power and turning off while your are driving like the key is being turned off. So in effect you are loosing power to the control wiring in the start circuit somewhere.
Check the battery connector and make sure it is in good condition, no melted contact slots. You can look inside the battery connector where the metal contacts are and if you see any melting on either the positive or negative contact slots it could be loosing power because of this, a bad connection. If you do not find any problem there then it could be some loose connection in the wiring somewhere else.
As edward says though, if you are going to check any of the wiring circuits in the rear panel or under the floor plate make sure you disconnect the battery, jack up the front wheels and discharge the capacitor (if this is the ev100 system) using a metal shunt across the capacitor terminals. Every time you energise the power on the truck the capacitor charges up so just keep this in mind if you are going into the rear of the truck at any time. Touching that capacitor could be a painful experience and can knock you on your butt if not careful. Of course if this truck has the GE SX contollers you will not have to worry about that capacitor, it would be inclosed inside the gray box's out of harms way.
all the codes on this truck less than -09 are what we call "static return to off" meaning they are related to the way the truck should start up. The truck shut down drive control. check the key switch wiring.
You really should get an experienced electric forklift tech to check your truck. (paying for a service call can be a lot less expensive than throwing parts at it). But to help your boss out, have an industrial battery company check the battery 1st. (it is a well educated guess) if the battery tests good, you are going to have to have someone that knows what they are looking at, eyeball the drive motor brushes and contactor tips.
My bet/W.A.G. is you have a bad battery and a load of corrosion under the battery.
5489 is hours most likely traction controller on hours, the other most likely hydraulic controller hours. error codes have a "-" in the first digit.
You might try and read the operators manual to see what the normal operation should be.
If you are going to check the wiring (or attempt any other work), make sure to get the drive wheels off the ground and disconnect the battery first. Electric forklifts do not use the frame as a path to battery negative, and have capacitors that hold enough power to move the truck, even when the battery is disconnected (they be dangerous).
I finally did replace the accelerator sensor with a new one, but the same symptoms popped up--lift drives fine for about 10 minutes, and then cuts power to the wheels accompanied by error code -07.
I'm no forklift technician, just an employee with some mechanical ability trying to troubleshoot, but I'm guessing the next step is to follow the wiring path to see if any shorts are obvious?
Another issue has also come to my attention: when the lift is turned off, error codes 5489 and 0836 pop up just before it powers off completely.
Any help is much appreciated.
Status code -07 Accelerator voltage too high on power
up after initial key switch closure.
Possible causes:
Accelerator input mis-adjusted or defective.
=
Input voltage at P7 should be less than 3.7
volts. Adjust or replace accelerator unit to
insure that the voltage at P7 will vary from 3.5
volts to less than.5 volts when the pedal is
depressed.
Open circuit between battery negative and P7 in
accelerator input circuit.
=
Check for broken wires or loose connections
or open potentiometer / voltage supply.
Short circuit from battery positive to wiring in
accelerator input circuit.
=
Disconnect wire from P7 and measure
voltage at wire to negative. Should be zero
volts for potentiometer type and less than 3.7
volts for solid state type accelerator input.
The reference to 'P7' is for the wiper circuit wire in the accelerator potentiometer, so what it is saying is to check the potentiometer for shorts to negative.
Sounds to me like a defective accelerator pot
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