M415B Micro Microstepping Driver Manual V2.0
Tel: +086 0755-26434369 7 Web Site: www.leadshine.com
the driver draws current from the power supply capacitor of the unregulated supply only during the
ON duration of the PWM cycle, but not during the OFF duration. Therefore, the average current
withdrawn from power supply is considerably less than motor current. For example, two 3A motors
can be well supplied by one power supply of 4A rating.
Multiple Drivers
It is recommended to have multiple drivers to share one power supply to reduce cost, if the supply
has enough capacity. To avoid cross interference,
DO NOT
daisy-chain the power supply input pins
of the drivers. (Instead, please connect them to power supply separately.)
Selecting Supply Voltage:
The power MOSFETS inside the M415B can actually operate within +15V
～
+40VDC, including
power input fluctuation and back EMF voltage generated by motor coils during motor shaft
deceleration. Higher supply voltage can increase motor torque at higher speeds, thus helpful for
avoiding losing steps. However, higher voltage may cause bigger motor vibration at lower speed, and
it may also cause over-voltage protection or even driver damage. Therefore, it is suggested to choose
only sufficiently high supply voltage for intended applications, and it is suggested to use power
supplies with theoretical output voltage of +24
～
+ 36V, leaving room for power fluctuation and
back-EMF.
7. Selecting Microstep Resolution and Driver Output Current
This driver uses a 6-bit DIP switch to set microstep resolution, and motor operating current, as shown
below:
Microstep Resolution Selection
Microstep resolution is set by SW4, SW 5, SW 6 of the DIP switch
as shown in the following table:
Microstep
Steps/rev.(for 1.8
°
motor)
SW4
SW5
SW6
1
200
ON
ON
ON
2
400
OFF
ON
ON
4
800
ON
OFF
ON
8
1600
OFF
OFF
ON
16
3200
ON
ON
OFF
32
6400
OFF
ON
OFF
64
12800
ON
OFF
OFF
M415B Micro Microstepping Driver Manual V2.0
Tel: +086 0755-26434369 8 Web Site: www.leadshine.com
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.
Dynamic current setting
Peak current (A)
SW1
SW2
SW3
0.21A
OFF
ON
ON
0.42A
ON
OFF
ON
0.63A
OFF
OFF
ON
0.84A
ON
ON
OFF
1.05A
OFF
ON
OFF
1.26A
ON
OFF
OFF
1.50A
OFF
OFF
OFF
Notes:
Due to motor inductance, the actual current in the coil may be smaller than the dynamic
current settings, particularly under high speed condition.
Standstill Current
The standstill current of the M415B will automatically be reduced to 60% of the selected 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. If the application needs a different standstill current, please
contact Leadshine.
8. Wiring Notes
l
In order to improve anti-interference performance of the driver, it is recommended to use
twisted pair shield cable.
l
To prevent noise incurred in pulse/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.
l
If a power supply serves several drivers, separately connecting the drivers is recommended
