Ok, here's the low down on this problem. We were supplied with a honeywell 90 degree position sensor. It looks just like a pot but it draws a bit of current. It seems there are models that are made for this sensor and others that use a common pot. Due to the current it draws this device was pulling down the pot high signal and pulling up the pot low sensor so the wiper voltage at J4-7 was all wrong. Either get a pot or rewire the positive and negative of the sensor to +ve on J4-15 and negative on J4-16. Leave the wiper on J4-7. Then you need to measure the value in the handset monitor and program the values for left centre and right into the controller. This is for models with Curtis controllers 1310-5310 and 2 sepex controllers.

JonoG,
yeah the 2.1v could be within acceptable tolerance to set that sensor but the general theory in setting them is to find the center voltage range or closest to it.

As for the curtis handset reading?
not familiar with that system being in a bendi, i've only seen the ev100 and then the system after that which was unique to their machines, maybe either danfoss or sevcon, not sure even though it did have it's own specific handset.
If this machine has a curtis controller then it's something newer than i know about.
With that said though, curtis is not new to me and it reading the directional inputs backwards does sound odd, like it's wired in backwards at some point maybe?

Thanks for that. In this case the sensor is a Honeywell rotation sensor 90 degrees. I found some data on it and it should be full left = 0,5 volts - full right = 4,5 volts. And in one of the posts here someone mentioned the centre should read 2.1 volts.

The other puzzle for me is when we connect the curtis handset to the main controller and monitor the inputs, the forward and reverse connections are reversed. When we activate the forward control it shows as reverse on the handset and similarly when we activate the reverse control then the monitor shows forward. I wonder if you, or anyone can shed some light on this ?

in most cases with any potentiometer (or sensor) that reads in a bi-directional fashion you would always set it up to 'center' using a ohm/volt meter.
You take the full range of the resistance reading and divide it in half and that is your center. example: 5k pot would center at 2.5k (if you use voltage) it would serve in the same manner, a 5v pot signal would be set to 2.5v.
Now if this sensor is a self centering sensor then you would not have to set anything, it would automatically return to center. It's been a while since i've dealt with any bendi's so i cannot remember which type sensor is on these machines.

I'm pretty sure this sensor on these bendi's serve two purposes, it tells the steer indicator where to point so you can visually see it's position on the indicator (if the truck has a mast/fork position display) and it also signals to the drive controllers the position of the mast in a turn so it can cut back the power to the inside drive motor in a turn and in the tightest turn even reverse the inside motor for maximum turning efficiency. So make sure you have the mast pointed straight ahead and get the sensor centered as close as possible to center.

Hi, could you,or someone, expand a little on this method with the voltmeter?

I see it is not in fact a pot but rather a hall effect position sensor (https://asset.conrad.com/media10/add/160267/c1/-/en/001207627DS01/datasheet-1207627-honeywell-aidc-angle-and-tilt-sensor-rty090hveax-rty090hveax-reading-range-90-max-analogue-voltage-amp-superseal.pdf).

From what I can gather it is designed to give 4.5 volts full right and 0.5 full left but the specs don't specify what the zero position should be.

You can set them up manually, but its best to get a volt meter to set it up properly