Stepper Motor Operation
Current Level Setup (AG Command)
The AMP-440x0 has 4 amplifier gain settings. The amplifier gain (in Amps/Volt) is set with the AG command as
shown in Table A8.4 for AGm=n, where m is a specific axis. The axis must be in a motor off (MO) state prior to
execution of the AG command.
AG setting Gain Value
n = 0 0.5 A/V
n = 1 0.75 A/V
n = 2 1.0 A/V
n = 3 1.4 A/V
Table A8.4: Amplifier Gain Settings
Low Current Setting (LC Command)
By default, Low Current mode is disabled (LCm = 0) which means that 100% of the current set by the AG command
will be delivered to the motor while the axis is holding position. An axis can be configured for Low Current mode so
either 25% of the current or no current will be sent to the motor while holding position. Low Current mode can
also be configured to wait a specified number of samples after a move is completed before lowering the holding
current.
Low Current Operation per Axis: YA n,n,n,n,n,n,n,n
LC setting Effect on Stepper Phase Current
n > 1 n samples after move finishes before going to 0% holding current
n = 1 25% holding current immediately after move finishes
n = 0 100% holding current
n < 0 n samples after move finishes before going to 25% holding current
Table A8.5: Low Current Mode configurations
Step Drive Resolution Setting (YA command)
When using the SDM-44040, the step drive resolution can be set with the YA command. Note, when running in full
step mode – the current to the motor is 70% of maximum. All micro-step settings are able to deliver full current.
Step Drive Resolution per Axis: YA n,n,n,n,n,n,n,n
AG setting Gain Value
n = 1 Full
n = 2 Half
n = 4 1/4
n = 16 1/16
Table A8.6: Amplifier Gain Settings
A7 – SDM-44040 (-D4040,-D4020) ▫ 225 DMC-41x3 User Manual
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