Hmm
I would say wiring almost anything to the timer wouldn't work as the rails won't give enough juice to run the device. A transformer would help here, but don't ask me how wiring goes; I have no experience with timers of this sort or that old.
Is it single-phase or triple-phase?
For the manuals, you'll probably have to phone up the manufacturer and see if they still stock one or two, or in PDF format.
If worse comes to worse, you could probably fashion a simple, single signal timer from a few electrical components. Only if the AF timer doesn't work.
::Re-write::
I found a motor controller circuit with a potentiometer which you can use to control the motors speed and thus the signal created. Be careful, this is for a DC motor, a converter may be needed. A transformer will also be required.
http://www.dprg.org/tutorials/2005-11a/index.html
PWM means Pulse Width Modulation, which essentially is power bursting. What this is, a voltage is applied on and off extremely rapidly before the motor has enough time to slow and you can control speed by varying what's called the duty cycle. So a 10% duty cycle will result in a slow speed, 100% the motor will be constantly on.
It's probably not the best solution, but at least it's one.
Hope this helps.