Operation
The SDM-44040 should be setup for Active High step pulses (MT-2 or MT-2.5).
The AG command sets the current on each axis, the LC command configures each axis’s behavior when holding
position and the YA command sets the step driver resolution. These commands are detailed below, see also the
command reference for more information:
Current Level Setup (AG Command)
AG configures how much current the SDM-44040 delivers to each motor. Four options are available: 0.5A, 0.75A,
1.0A, and 1.4 Amps
Drive Current Selection per Axis: AG n,n,n,n,n,n,n,n
n = 0 0.5 A
n = 1 0.75 A (default)
n = 2 1.0 A
n = 3 1.4 A
Low Current Setting (LC Command)
LC configures each motor’s behavior when holding position (when RP is constant) and multiple configurations:
LC command set to 0 “Full Current Mode” - causes motor to use 100% of peak current (AG) while at a
“resting” state (profiler is not commanding motion). This is the default setting.
LC command set to 1 “Low Current Mode” - causes motor to use 25% of peak current while at a “resting”
state. This is the recommended configuration to minimize heat generation and power consumption.
LC command set to an integer between 2 and 32767 specifying the number of samples to wait between
the end of the move and when the amp enable line toggles
Percentage of full (AG) current used while holding position with LC n,n,n,n,n,n,n,n
n = 0 100%
n = 1 25%
The LC command must be entered after the motor type has been selected for stepper motor operation (i.e. MT-2,-
2,-2,-2). LC is axis-specific, thus LC1 will cause only the X-axis to operate in “Low Current” mode.
A7 – SDM-440x0 (-D4040,-D4020) ▫ 249 DMC-40x0 User Manual
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