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#L010128
June 2002
Setting the Output Current
The output current on the MBC25P11 is set by the on-board potentiometer R29 (Refer to Dimensions/
Jumper and Potentiometer Locations). This current adjust potentiometer determines the per phase peak
output current of the driver. This relationship between the output current and the potentiometer setting is
as follows:
Potentiometer Settings
Peak Current
Potentiometer Setting
0.5A
0%
0.7A
10%
0.9A
20%
1.1A
30%
1.3A
40%
1.5A
50%
1.7A
60%
1.9A
70%
2.1A
80%
2.3A
90%
2.5A
100%
Microstep Modes
The microstepping modes are set by using the software when the profiles are being setup. The ranges of
microstepping are 200, 400, 800, and 1600 steps per revolution in a 200 step/revolution step motor. To
set the divisor just select the divisor wanted (1,2,4, or 8). (Refer to Motion Tab Sheet)
Jumper Functions
Jumper #
1-2
2-3
JP1
Negative Going Inputs
Positive Going Inputs
Reducing Output Current
Reducing the output current is accomplished automatically depending on the current reduction setting in
the SMPG10WIN software. The amount of current per phase in the reduction mode is approximately 70%
of the set current. When the current reduction circuit is activated, the current reduction resistor is paralleled
with the current adjustment potentiometer. This lowers the total resistance value, and thus lowers the per
phase output current. This is done when the pulse generator is not running. (Refer to Motion Tab Sheet)
July 2018
