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2.5 Stepper Motor driver
2.5 Stepper Motor driver
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2.5 Amp Stepping Motor Driver for 3D Printer MainBoard
$38.00
Introduction:

This stepper motor driver plugs conveniently into the 3D Printer main board. No cables from the main board to this board is necessary.

Description:

This is an exceptionally smooth 2.5 amp stepper motor driver that can be microstepped up to 1/32 which is very high for this type of driver. The driver is also unusually easy to configure with only one trimmer to set the amount of current you will allow the motor to draw. The driver chip has all kinds of built-in protection including protection for heat and over current, so you can use this driver with piece of mind.

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Instructions
2.5 amp driver diagram with headers and pin out descriptions.

General Diagram for the 2.5 amp Driver. If you intend on using this driver as a standalone unit, not connected to the 3D Printer Main Board, you can use this diagram to connect the various headers and for the microstepping dip switch settings.

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The LED and fault conditions: The driver's LED serves to indicate a fault condition. The driver chip has built in protection for overheating and over current. If the LED is on, most likely, the driver will stop until the condition is resolved. If you see the LED on, adjust the vref trimmer. First, connect a multimeter to the pads just next to the trimmer potentiometer and adjust until the voltage is lowered a bit. Alternatively, even though the PCB contains a vast amount of thermal vias and a relatively large ground plane connected to the belly of the driver, there still may be a need to cool the driver chip using a small heat sink. Do this only if you are not satisfied with the performance of the motor at the torque require.

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