DM856 Digital Stepping Driver Manual V1.0
Tel: +086 0755-26434369 9 Web Site: www.leadshine.com
Microstep
Steps/rev.(for 1.8
°
motor)
SW5
SW6
SW7
SW8
1 to 512
Default/Software configured
ON
ON
ON
ON
2
400
OFF
ON
ON
ON
4
800
ON
OFF
ON
ON
8
1600
OFF
OFF
ON
ON
16
3200
ON
ON
OFF
ON
32
6400
OFF
ON
OFF
ON
64
12800
ON
OFF
OFF
ON
128
25600
OFF
OFF
OFF
ON
5
1000
ON
ON
ON
OFF
10
2000
OFF
ON
ON
OFF
20
4000
ON
OFF
ON
OFF
25
5000
OFF
OFF
ON
OFF
40
8000
ON
ON
OFF
OFF
50
10000
OFF
ON
OFF
OFF
100
20000
ON
OFF
OFF
OFF
125
25000
OFF
OFF
OFF
OFF
Current Settings
For a given motor, higher driver current will make the motor to output more torque, but at the same
time causes more heating in the motor and driver. 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 driver output current depending on motor phase current, motor leads and connection methods.
Phase current rating supplied by motor manufacturer is important in selecting driver current, however
the selection also depends on leads and connections.
When it
’
s not in software configured mode, 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.
DM856 Digital Stepping Driver Manual V1.0
Tel: +086 0755-26434369 10 Web Site: www.leadshine.com
Dynamic current setting
Peak Current
RMS Current
SW1
SW2
SW3
Default/Software configured (0.5 to 5.6A)
OFF
OFF
OFF
2.1A
1.5A
ON
OFF
OFF
2.7A
1.9A
OFF
ON
OFF
3.2A
2.3A
ON
ON
OFF
3.8A
2.7A
OFF
OFF
ON
4.3A
3.1A
ON
OFF
ON
4.9A
3.5A
OFF
ON
ON
5.6A
4.0A
ON
ON
ON
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 60% 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.
8. Wiring Notes
l
In order to improve anti-interference performance of the driver, it is recommended to use
twisted pair shield cable.
l
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.
l
If a power supply serves several drivers, separately connecting the drivers is recommended
instead of daisy-chaining.
l
It is prohibited to pull and plug connector P2 while the driver is powered ON, because there is
high current flowing through motor coils (even when motor is at standstill). Pulling or plugging
