Digital Stepper Drive DM320T
8
Microstep
Steps/rev.(for 1.8°motor)
SW4
SW5
SW6
2
400
ON
ON
ON
4
800
OFF
ON
ON
8
1600
ON
OFF
ON
16
3200
OFF
OFF
ON
32
6400
ON
ON
OFF
64
12800
OFF
ON
OFF
20
4000
ON
OFF
OFF
40
8000
OFF
OFF
OFF
7.2 Current Configurations
For a given motor, higher drive current will make the motor to output more torque, but at the same time causes more
heating in the motor and drive. Therefore, output current is generally set to be such that the motor will not overheat
for long time operation. Since parallel and serial connections of motor coils will significantly change resulting
inductance and resistance, it is therefore important to set drive output current depending on motor phase current,
motor leads and connection methods. Phase current rating supplied by motor manufacturer is important in selecting
drive 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.
7.2.1 Dynamic Current Configurations
Peak Current
RMS Current
SW1
SW2
SW3
0.3A
0.21A
ON
ON
ON
0.5A
0.35A
OFF
ON
ON
0.7A
0.49A
ON
OFF
ON
1.0A
0.71A
OFF
OFF
ON
1.3A
0.92A
ON
ON
OFF
1.6A
1.13A
OFF
ON
OFF
1.9A
1.34A
ON
OFF
OFF
2.2A
1.56A
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.
7.2.2 Standstill Current Configuration
The standstill current is set to be 50% of the selected output current. It means standstill current automatically
reduced to 50% of the selected dynamic current 0.4 second after the last pulse.
7.3 Automatic Motor Matching & Self Configuration
When powered on a DM320T will automatically configure itself with the best settings to match the driven stepper
motor for optimal performance. No action is needed.
