December 2004
Step Motor Selection Guide

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TABLE 5 - Table Selection for Anaheim Automation Motor Current Settings.
Reducing Output Current
Reducing the output current is accomplished by setting switch 1 of the DIP switch to the ON position and
occurs approximately 1 second after the last positive going edge of the step clock input. 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 poten-
tiometer. This lowers the total resistance value, and thus lowers the per Phase output current.
Determining Output Current
The output current for the motor used when microstepping is determined differently from that of a full/half
step unipolar driver. In the MBC08161, a sine/cosine output function is used in rotating the motor. The
output current for a given motor is determined by the motors current rating and the wiring configuration of
the motor. There is a current adjustment potentiometer used to set the output current of the MBC10641.
This sets the peak output current of the sine/cosine waves. The specified motor current (which is the
unipolar value) is multiplied by a factor of 1.0, 1.4, or 2.0 depending on the motor configuration (series,
half-coil, or parallel).
elpmaxErotoM tnerruCrotoM edoCrebmuN ralopinU gnitaR kaePseireS gnitaR kaePlellaraP gnitaR
seireS tnerruC gnitteS
lellaraP tnerruC gnitteS
1D3220S 20 A0.1A0.1A0.2----%5
3L32308WL-D 30 A5.1A5.1A0.3%0%02
1N43408WL-S 40 A0.2A0.2A0.4%5%03
04L32508WL-D 50 A5.2A5.2A0.5%01%04
1A4360B 60 A0.3A0.3A0.6%02%05
2N43708WL-S 70 A5.3A5.3A0.7%52%06
1K43808WL-S 80 A0.4A0.4A0.8%03%07
2N2490BC-S 90 A5.4A5.4A0.9%53%58
3L32018WL-S 01 A0.5A0.5A0.01%04%001
3D4311D 11 A5.5A5.5A0.11%54%001
1K2421BC-S 21 A0.6A0.6A0.21%05%001
2D4331S 31 A5.6A5.6A0.31%55%001
3N43418WL-S 41 A0.7A0.7A0.41%06%001
1N2451BC-D 51 A5.7A5.7A0.51%56----
4K43618WL-S 61 A0.8A0.8A0.61%07----
1D2491D 91 A5.9A5.9A0.91%09----
3N2422BC-S 22 A0.11A0.11A0.22%001----
2D2452S 52 A5.21A5.21A0.52%001----