PST5056 User Manual
REV1.0 9
When it’s not in software configured mode, microstep resolution is set by SW5, 6, 7, 8 of the
DIP switch
as shown in the following table:
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
7.2 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.
PST5056 User Manual
REV1.0 10
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.
7.2.1 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.
7.2.2 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 PrimoPal.
8. Wiring Notes
In order to improve anti-interference performance of the driver, 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 a power supply serves several drivers, separately connecting the drivers is
recommended instead of daisy-chaining.
