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Powerful and affordable motion control at last!

**Specifications**
Part No.	10020
Description	Multi-Axis Motion Control Driver
Driver type	bipolar chopper
Number of Drivers	2, 3, or 4, depending on purchase
Computer protection	Parallel port interface opto-isolated
Motor protection	Idle motor current reduction
Driver protection	main fuse
Step Mode	Half
Dimensions	10" x 7" x 4"
Weight	10 lbs
Power Supply	120 Watt
Power In	110 VAC or 220 VAC (flip switch)
Fan	3" DC
Input connector	25 pin female
Output	Four 8-pin round DIN receptacles, 3.5A each
Switch	On/Off toggle, power-on light
Case	Brushed Aluminum bottom, black textured steel top.

Front View

Back View

Inside View

The pro bipolar chopper motion controller (P/N 10020) has a 120 Watt power supply and can provide up to 3.5 amps of power at 24 volts to each of up to 4 step motors. Current output is set with a sense resistor at the factory for 2 amps to work with our 144 and 250 oz-in motors but can be changed if needed. The box measures 11" x 7" x 4", has four rubber feet, and weighs 10 pounds. The front panel has an on/off power switch, power-on light, and four 8-Pin circular DIN receptacles for the step motor connectors. The back panel has a 25 pin male connector, a power connector and a 9-pin female connector. The 25 pin connector plugs into your PC's printer port via a 25 pin DB25 M/F cable. The 9 pin connector provides easy access to pins 18-25 (gnd), 13, 12, 11, 10, 1, 17, 16, and 14. That connector was put into the circuit for EasyCAM Pro software features. The only one that is supported by MyT'Mill software is pin 10, emergency stop. Connect a switch between it and ground and MyT'Mill will stop the motors if the switch is closed and if Limit Switch Checking is checked under Edit|Preferences.

Bipolar drivers are more powerful than unipolar drivers because more of the stepper motor windings are engaged at any one time. Bipolar circuit designs change the polarity of the stepper winding with each step. Chopper-type drivers are more powerful and faster because they use higher voltages to increase the current flowing through the stepper motor windings up to their rated levels more quickly. Then the circuit "chops" the voltage to maintain that current level. A bipolar chopper driver is a complicated circuit that combines these two features. The result is a torque vs speed curve that maintains higher torque (compared to the unipolar drive) as speed increases. While the torque at very low speeds is comparable, the bipolar driver maintains it better as the speed increases.

The four blue boxes shown on the inside view are the actual drivers themselves. The modular design allows for easy expansion to 3 or 4 drivers at a later date or for easy replacement in the unlikely event a problem develops. Each driver just plugs in to the circuit board and is held down by a long screw. Each driver has an "idle motor current reduction" feature which senses motor motion and reduces the current by half when not spinning. This saves energy and the motors don't get as hot, increasing their life span.