DM422C Digital Stepping Driver Manual V1.0
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9
it may also cause over-voltage protection or even Drive damage. Therefore, it is suggested to choose
only sufficiently high supply voltage for intended applications, and it is suggested to use power
supplies with theoretical output voltage of +20 ~ +36VDC, leaving room for power fluctuation and
back-EMF.
7. Selecting Microstep Resolution and Drive Output Current
Microstep resolutions and output current are programmable, the former can be set from full-step to
102,400 steps/rev and the latter can be set from 0.3A to 2.2A. See more information about
Microstep
and Output Current Setting
in Section 13.
However, when it
’
s not in software configured mode, this Drive uses a 6-bit DIP switch to set
microstep resolution, and motor operating current, as shown below:
Microstep Resolution Selection
When it
’
s not in software configured mode, microstep resolution is set by SW5, 6 of the DIP switch
as shown in the following table:
Microstep
Steps/rev.(for 1.8
°
motor)
SW5
SW6
1 to 512
Default/Software configured
ON
ON
8
1600
OFF
ON
16
3200
ON
OFF
32
6400
OFF
OFF
Current Settings
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
DM422C Digital Stepping Driver Manual V1.0
Tel: +000 0000-00000000
10
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.
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.
Dynamic current setting
Peak Current
RMS Current
SW1
SW2
SW3
Default/Software configured (0.3 to 2.2A)
ON
ON
ON
0.5A
0.35 A
OFF
ON
ON
0.7A
0.50 A
ON
OFF
ON
1.0A
0.71 A
OFF
OFF
ON
1.3A
0.92 A
ON
ON
OFF
1.6A
1.13 A
OFF
ON
OFF
1.9A
1.34 A
ON
OFF
OFF
2.2A
1.56 A
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 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
In order to improve anti-interference performance of the Drive, it is recommended to use
twisted pair shield cable.
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Sarach 10 – D-77790 Steinach
Telefon: +49 7832 / 9744670
