Need Help!- Dragon Driver ramp capacitor

[BTD]

I'm using a Dragon Driver w/ a Keling 282 oz in stepper motor to power a plasma torch track burner.

This is a self-contained driver with on-board speed adjust, CW/CCW select, and on-off control via several low voltage contacts/pins. The only electrical components you need is the Dragon driver, a power supply, and the stepper motor.

To start and stop the motor, you ground (or unground) the "enable" pin on the driver board.

I need the ability to ramp up the motor speed from 0 to whatever speed I've pre-set so the motor doesn't lock up. Without the ramp feature, if the speed setting is too high, the motor locks up when you ground the pin. A low setting is fine but I really need the ability to run fast sometimes.

I can start out at a low speed and slowly increase the speed but that's not the ideal situation.

The Dragon driver manual says that the device has a provision for adding an extra capacitor to allow the speed to ramp up BUT there's a catch. It only works when you first apply AC to the board. That's no good. Under normal operation, AC is on all the time. The only time the motor spins is when you ground the enable pin and that's when I need the ramp function.

Does anyone here have experience with this Dragon driver and the ramp capacitor feature?

BTW...the capacitor I'm using is an electrolytic, 25 vdc, 220 uF and I do know that these are polarized.

[johnmac]

I have 3 of those drivers. I decided to go with Geckos, so I never really used them. I never bothered to figure out the ramping, as the ramping can be set in Mach.

John