Step Drive Resolution Setting (YA command)
When using the SDM-44040, the step drive resolution can be set with the YA command
Step Drive Resolution per Axis: YA n,n,n,n,n,n,n,n
n = 1 Full
1
n = 2 Half
n = 4 1/4
n = 16 1/16
1
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.
ELO Input
If the ELO input on the controller is triggered, the amplifier will be shut down at a hardware level, the motors will
be essentially in a Motor Off (MO) state. TA3 will change state and the #AMPERR routine will run when the ELO
input is triggered. To recover from an ELO, an MO followed by a WT 2, and an SH must be issued, or the controller
must be reset.
It is recommended that OE1 be used for all axes when the ELO is used in an application.
See the Optoisolated Input Electrical Information section in Chapter 3 Connecting Hardware for information on
connecting the ELO input.
Using External Amplifiers
Use the connectors on top of the controller to access necessary signals to run external amplifiers. For more
information on connecting external amplifiers, see Step A in Chapter 2.
Protection Circuitry
The SDM-44040 has short circuit protection. The short circuit protection will protect against phase to phase shorts,
a shorted load and a short to ground or chassis.
In the event of any of a fault, TA0 will change state and the SDM-44040 will be disabled.
In the event that power is removed to the SDM-44040 but not to the controller, an amplifier error will occur.
To recover from an error state, all 4 axes need to be set into MO state, LC must set to 0 and then the SH command
must be issued.
A7 – SDM-440x0 (-D4040,-D4020) ▫ 250 DMC-40x0 User Manual
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