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MA860H Microstepping Driver Manual V1.0
Dynamic current setting
Peak Current
2.6A
3.2A
3.8A
4.4A
5.1A
5.8A
6.5A
7.2A
Notes: Ref Current table on the screen printing is used for the users of the MA860H to refer.
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
contact NC-Tech.
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.
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 connector P2 with power on will cause extremely high back-EMF voltage
surge, which may damage the driver.
9. Typical Connection
A complete stepping system should include stepping motor, stepping driver, power supply and controller (pulse generator). A typical
connection is shown as figure 10.
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Ref Current (Screen
printing)
1.8A
2.3Ａ
2.7A
3.1A
3.6A
4.1A
4.6A
5.00
*R) of the original value. If the application needs a different standstill current, please
2
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SW1
SW2
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
OFF
OFF
OFF
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SW3
ON
ON
ON
ON
OFF
OFF
OFF
OFF
Due to motor inductance, the actual
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