Tension Motor Wiring |
How to wire up tension motors.
Crydom D1225 or equivalent panel mount solid state relays work well.
When wiring ground to the parallel port, solder together pins 18 thru 25 together at the connector, and use all of them as your logic ground ("-" on the 5VDC supply in the above diagram).
Variac allows camera operator to control the overall power to the tension motors. Power resistors across the relay outputs (R) allows a small bit of power to leak to tension motors when relay is off, to ensure the film doesn't unspool.
In the opcsdefs.opc file, configure the tension command to control the port/bit mask on your parallel port, eg:
tension a 378 01 00 0 # aerial projector tension: pin 2 tension b 378 02 00 0 # main projector tension: pin 3 tension b 378 04 00 0 # camera tension: pin 4You can actually choose any output pins on the parallel port that you want. Starting with pin 2 is arbitrary, but recommended for simplicity.
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