Amazone drill problem

[jjm]

I have a Amazone ADP special Combi drill that is playing up. The speed is generated by a electric metering wheel with a inductive proximity switch but the when travelling the speed read out on the screen is jumping 2 km either side of where it should be. I have re calibrated it on a 100 metre run but still it tells me I am going faster than I am and subsequently it is sowing too much. Any ideas???.
Thanks.

 

[DieselRob]

What is your impulses figure? I never bother with the 100m calibration but just alter the impulses number so that drill speed matches the GPS speed on the tractor. It varies between 2000 and 2050 iirc depending on whether on ploughing or min till.

Does your speed wheel spin freely? Does it bounce when you're drilling? (Does it settle down if you drive slower?)

 

[Chae1]

I have a Amazone ADP special Combi drill that is playing up. The speed is generated by a electric metering wheel with a inductive proximity switch but the when travelling the speed read out on the screen is jumping 2 km either side of where it should be. I have re calibrated it on a 100 metre run but still it tells me I am going faster than I am and subsequently it is sowing too much. Any ideas???.
Thanks.

Could you swap the sensor with another to check it's not faulty? Think the one on my Avant has a light.

When mine wasn't reading speed right it was D plug at back. It has front box though and blows seed back.

 

[jjm]

Swapped the sensor with another one and now it is even more unsettled. Starting to think the proximity switch is too far from the wheel and therefore not getting a consistent reading. However, the reason the sensor before broke was because it was too close and the wheel damaged the plastic shroud it is held in. Would 2mm be about the right distance away or closer?!.

 

[jjm]

What is your impulses figure? I never bother with the 100m calibration but just alter the impulses number so that drill speed matches the GPS speed on the tractor. It varies between 2000 and 2050 iirc depending on whether on ploughing or min till.

Does your speed wheel spin freely? Does it bounce when you're drilling? (Does it settle down if you drive slower?)

All free, very little bounce, changed 2 k either way despite how consistent the actual speed is.
Tried 1700, 1900, 1950 and all similar!

 

[DieselRob]

All free, very little bounce, changed 2 k either way despite how consistent the actual speed is.
Tried 1700, 1900, 1950 and all similar!

Is the rotation speed figure as erratic? Does the wheel sit at a consistent distance from the sensor? Ie the wheel/shaft isn't bent.