MD24 / MD28
– Hardware Description
11
10.1.2
MD28
Mikrostep
Schritte/Umdr. SW5 SW6 SW7 SW8
2
400
ON
ON
ON
ON
4
800
OFF
ON
ON
ON
8
1600
ON
OFF
ON
ON
16
3200
OFF OFF
ON
ON
32
6400
ON
ON
OFF
ON
64
12800
OFF
ON
OFF
ON
128
25600
OFF OFF OFF
ON
256
51200
ON
OFF OFF
ON
5
1000
ON
ON
ON
OFF
10
2000
OFF
ON
ON
OFF
20
4000
OFF OFF
ON
OFF
25
5000
ON
OFF
ON
OFF
40
8000
ON
ON OFF OFF
50
10000
OFF
ON
OFF OFF
100
20000
ON
OFF OFF OFF
200
40000
OFF OFF OFF OFF
10.2 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.
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.
10.2.1
MD24
Peak current [A]
RMS [A]
SW1 SW2 SW3
1,00
0,71
ON
ON
ON
1,46
1,04
OFF
ON
ON
1,91
1,36
ON
OFF
ON
2,37
1,69
OFF
OFF
ON
2,84
2,03
ON
ON
OFF
3,31
2,36
OFF
ON
OFF
3,76
2,69
ON
OFF OFF
4,20
3,00
OFF
OFF OFF
Note:
Due to motor inductance, the actual current in the coil may be smaller than the
dynamic current settings, particularly under high speed condition.
