5
WM540 High Performance Microstepping Driver
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Setting Proper Output Current
For a given motor, higher driver current will make the motor 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 to selecting driver current, but
the selection also depends on leads and connection:
6.
Selecting Microstep Resolution and Driver Current Output
This driver uses an 8-bit DIP switch to set microstep resolution, dynamic current and standstill current, as shown below:
Current during motion
Microstep resolution
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Microstep Resolution Selection
Microstep resolution is set by SW5, 6, 7, 8 of the DIP switch as shown in the following table:
Microstep Step/rev.(for 1.8°motor)
SW5
SW6
SW7
SW8
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
2 400
OFF
ON
ON
ON
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Current Setting
The first three bits (SW1, 2, 3) of the DIP switch are used to set the current during motion (dynamic current ), while
SW4 is used to select standstill current.
WM540 DIP Switch settings for RMS current during motion:
RMS Current
for WM540
SW1
SW2
SW3
1.5A
on
off
off
1.9A
off
on
off
2.3A
on
on
off
2.7A
off
off
on
3.1A
on
off
on
3.5A
off
on
on
4.0A
on
on
on
Standstill Current (half/full)
1 2 3 4 5 6 7 8
* For the European Market – the maximum input voltage must be limited to 70VDC to comply with CE regulations.
