DM556T Digital Stepper Drive User Manual
9
motor’s required current.
7.2.1 Dynamic Current Configurations
Peak Current
RMS Current
SW1
SW2
SW3
1.8A
1.3A
ON
ON
ON
2.1A
1.5A
OFF
ON
ON
2.7A
1.9A
ON
OFF
ON
3.2A
2.3A
OFF
OFF
ON
3.8A
2.7A
ON
ON
OFF
4.3A
3.1A
OFF
ON
OFF
4.9A
3.5A
ON
OFF
OFF
5.6A
4.0A
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
SW4 is used to set motor idle current percentage. At OFF position it means the standstill current is set to be 50% of
the selected output current. At ON position it means standstill current is set to be the same as the selected dynamic
current.
The 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 DM556T will automatically configure itself with the best settings to match the driven stepper
motor for optimal performance. No action is needed.
8. Wiring Notes
In order to improve anti-interference performance of the drive, it is recommended to use twisted pair shield
cable.
To prevent noise incurred in PUL/DIR signal, pulse/direction signal wires and motor wires should not be tied up
together. It is better to separate them by at least 10 cm, otherwise the disturbing signals generated by motor will
easily disturb pulse direction signals, causing motor position error, system instability and other failures.
If only one power supply serves multiple DM556T drives, separately connecting the drives to the power supply is
recommended instead of daisy-chaining.
It is prohibited to pull and plug connector P2 while the drive is powered ON, because there is high current
flowing through motor coils (even when motor is at standstill). Pulling or plugging connector P2 with power on
will cause extremely high back-EMF voltage surge, which may damage the drive.
9. Typical Connection
A complete stepping system should include stepping motor, stepping drive, power supply and controller (pulse
