ITS question

[sonnysmith]

I'm very sorry, but I have no ideal of what your talking about.
I can wire a house and golf cart. I know anything about the electronic on the ITS or controller.

So speak slow I'm old and dumb.

Sonny

[mjroman20]

Originally Posted by sonnysmith

I'm very sorry, but I have no ideal of what your talking about.
I can wire a house and golf cart. I know anything about the electronic on the ITS or controller.

So speak slow I'm old and dumb.

Sonny

It's more or less a needlessly complicated voltage divider. The ITS changes voltage drop based on the core being inserted into the winding. The control reads that voltage input. Compared to a pot the signal out of an ITS is proportionally much lower than the input.

[JohnnieB]

Originally Posted by mjroman20

It's more or less a needlessly complicated voltage divider. The ITS changes voltage drop based on the core being inserted into the winding. The control reads that voltage input. Compared to a pot the signal out of an ITS is proportionally much lower than the input.

Technically, the ITS sensor is a proximity sensor that draws proportionally more milliamps the further iron slug moved by the pedal is inserted into it.

There are two other parts to the ITS circuit, a power source and a detector, and both of them are located in the controller.

In all applications, all the ITS senor does is alter the current flow between the two wires connected to it, but when Curtis (and Curtis clone) controllers are used, the throttle input signal at the controller increases in voltage as the slug in inserted into the ITS sensor, while the voltage of the throttle input signal when Alltrax controllers are used, decreases.

Getting opposite results using the same ITS sensor is due to the Alltrax power source and detector being current based while the Curtis power source and detector are voltage based.

Therefore, whether an ITS sensor is a a "Voltage Divider" or a "Current Divider" depends on what controller it is attached to.

Attached are block and schematic diagrams of the ITS sensor as well as the Patent document, which includes a theory of operation.

[mjroman20]

Wohoo! Fun brain stuff to read over!

I haven't seen it used as a current divider before.

My main complaint about ITS is the mechanical flaw in it. Had a pedal box show up for repair once, the pedal itself was bent, which when aligned in the vehicle held the slug at a slight angle so it was just mashing into the side of the coil housing. So apparently the thought process was: since the pedal wont go down...step on it harder. Needless to say it tore the winding apart.

[rabbitreborn]

Originally Posted by mjroman20

Wohoo! Fun brain stuff to read over!

I haven't seen it used as a current divider before.

My main complaint about ITS is the mechanical flaw in it. Had a pedal box show up for repair once, the pedal itself was bent, which when aligned in the vehicle held the slug at a slight angle so it was just mashing into the side of the coil housing. So apparently the thought process was: since the pedal wont go down...step on it harder. Needless to say it tore the winding apart.

Is that really a design flaw or is it operator error? If the operator had stopped trying to jam the pedal and investigated the problem, he would not have damaged the ITS.

[mjroman20]

Originally Posted by rabbitreborn

Is that really a design flaw or is it operator error? If the operator had stopped trying to jam the pedal and investigated the problem, he would not have damaged the ITS.

A bit of both. But its not so much the ITS itself but the pedal box. would have been a good idea to put some guides on it to keep it centered with the opening.