The tension on the film in my film scanner is controlled by two Oriental Motor 4TK10A-AUL Torque motors. My understanding of how this works is that the torque motor, when given 60V AC, will simply act as a tensioning device on the film. It’s not really winding the film, it’s just maintaining the tension - if slack occurs, it picks it up, then when slack is gone it just holds there. There’s one of these motors for each side of the scanner (one for feed, one for take-up reels).
In the original design, there was no external motor controller, per se. It was all handled by feeding 60VAC from a gigantic transformer (which I’ve removed), through a potentiometer that set the torque (I think), and some relays to turn it all on and off. Since I removed the transformer, I’ve replaced it with a device sold by Oriental Motor that’s supposed to take the place of all that custom wiring the manufacturer of the scanner originally used. This is the TMP-1.
This device seems like a good fit, because it can be controlled from the Arduino. It would be nice to be able to control the direction from software, as sometimes film can be wound in the opposite direction, so I want to be able to load it with both winds.
In any case, all that to say that it ain’t working. I believe I’ve got everything connected up correctly to make it work in the clockwise direction. My Arduino (Uno) is set up as follows:
Pin 3: X0 - Clockwise signal
Pin 5: X1 - Counter-Clockwise Signal
Pin 6: X2 - Internal/External potentiometer signal (determines whether you have an optional external pot installed, or if you’re just using the one built into the TMP-1)
The Controller is getting 24v from a bench power supply, and the capacitor called for in the manual is the one that came with the motor. The 115V inputs are getting 115V.
Code is as simple as it gets:
I’m getting 5v at the controller on X0, and 0v on X1 and X2, which is what I expect - so the code is working and the wiring from the Arduino is doing what I want it to do. But the internal potentiometers on the TMP-1 do nothing, and there’s no tension in the motor at all. I’m not getting an alarm signal on the controller. I’ve tried this with both motors, though at the moment I only have one TMP-1 for testing.
Any ideas? Here are links to the documentation for the controller and the motor I’m using (on the motor manual, it’s in English a few pages in).
TMP-1 Datasheet: http://www.orientalmotor.com/products/pdfs/2009-2010/A/TMP-1-Brochure.pdf
TMP-1 Manual: http://www.orientalmotor.com/products/pdfs/opmanuals/HP-5036-2E.pdf
Motor Manual: http://www.orientalmotor.com/products/pdfs/opmanuals/HM-9085-3JE.pdf