DM503 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.
28B
Auto Tuning by SW4
The DM503 can identify the driven stepper motor and automatically configure the current loop for optical performance.
Change the modes switch SW4 two times (ON->OFF->ON, or OFF->ON-OFF) in one second after powering up. The
motor parameter will be identified and the drive’s current loop parameters are calculated automatically. The motor
shaft will have a little vibration during auto-configuration.
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.
