DM542 Fully Digital Stepper Drive Manual V1.0
8
connection methods. Phase current rating supplied by motor manufacturer is important in selecting driver current,
however the selection also depends on leads and connections.
The first three bits (SW1, 2, 3) of the DIP switch are used to set the dynamic current. Select a setting closest to your
motor’s required current.
Dynamic Current Setting
Peak Current RMS Current SW1 SW2 SW3
1.00A 0.71A ON ON ON
1.46A 1.04A OFF ON ON
1.91A 1.36A ON OFF ON
2.37A 1.69A OFF OFF ON
2.84A 2.03A ON ON OFF
3.31A 2.36A OFF ON OFF
3.76A 2.69A ON OFF OFF
4.20A 3.00A OFF OFF OFF
Notes: Due to motor inductance, the actual current in the coil may be smaller than the dynamic current setting,
particularly under high speed condition.
Standstill Current Setting
SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of the selected dynamic current,
and ON meaning that standstill current is set to be the same as the selected dynamic current.
The current automatically reduced to 50% of the selected dynamic current one second after the last pulse. Theoretically,
this will reduce motor heating to 36% (due to P=I
2
*R) of the original value. If the application needs a different
standstill current, please contact Leadshine.
28BAuto Tuning by SW4
To get the optimized performance, switch SW4 two times in one second to identify the motor parameter after power-up
if it is the first time installation. The motor parameter is identified and the drive’s current loop parameters are
calculated automatically when SW4 is activated. The motor shaft will have a little vibration during auto-configuration.
If the user changes the motor or the power supply, don’t forget to toggle SW4 once again.
Auto Tuning Requirement and Procedure:
1. Motor is connected to drive.
2. Power is connected to drive.
3. Turn on the power.
4. Make sure there is no pulse applied to drive.
5. Switch SW4 two times in one second. That is
OFF-ON-OFF or ON-OFF-ON.
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