MD24 / MD28
– Hardware Description
12
10.2.2
MD28
Peak current [A]
Nennstrom [A]
SW1 SW2 SW3
2,80
2,00
ON
ON
ON
3,50
2,50
OFF
ON
ON
4,20
3,00
ON
OFF
ON
4,90
3,50
OFF
OFF
ON
5,70
4,10
ON
ON
OFF
6,40
4,53
OFF
ON
OFF
7,00
5,00
ON
OFF OFF
7,80
5,57
OFF
OFF OFF
Achtung:
Durch die Induktivität des Motors, kann der aktuelle Motorstrom kleiner sein,
als der eingestellte Ausgangsstrom, insbesondere bei hohen Drehzahlen!
10.3 Standstill Current Setting
SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of
the dynamic current, and ON meaning that standstill current is set to be the same as
dynamic current.
The current automatically reduced to 60% of dynamic current setting one second after the
last pulse.
Theoretically, this will reduce motor heating to 36% (due to P=I
2
*R) of the original value.
11 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 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.
