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Sunwind Electronics Company Ltd.
Stepper Motor Driver:M542H
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
*R) of the original value. If the
2
application needs a different standstill current, please contact Sunwind.
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.
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