MA860H Microstepping Driver Manual V1.0
Tel: +086 0755-26434369 7 Web Site: www.leadshine.com
Parallel Connections
An 8 lead motor in a parallel configuration offers a more stable, but lower torque at lower speeds. But
because of the lower inductance, there will be higher torque at higher speeds. Multiply the per phase
(or unipolar) current rating by 1.96, or the bipolar current rating by 1.4, to determine the peak output
current.
Figure 9: 8-lead motor parallel connections
6. Power Supply Selection
The MA860H can match Large and small size stepping motors (from Nema size 17 to 43) made by
Leadshine or other motor manufactures around the world. To achieve good driving performances, it is
important to select supply voltage and output current properly. Generally speaking, supply voltage
determines the high speed performance of the motor, while output current determines the output
torque of the driven motor (particularly at lower speed). Higher supply voltage will allow higher
motor speed to be achieved, at the price of more noise and heating. If the motion speed requirement is
low, it
’
s better to use lower supply voltage to decrease noise, heating and improve reliability.
Regulated or Unregulated Power Supply
Both regulated and unregulated power supplies can be used to supply the driver. However,
unregulated power supplies are preferred due to their ability to withstand current surge. If regulated
power supplies (such as most switching supplies.) are indeed used, it is important to have large
current output rating to avoid problems like current clamp, for example using 4A supply for 3A
motor-driver operation. On the other hand, if unregulated supply is used, one may use a power supply
of lower current rating than that of motor (typically 50%
～
70% of motor current). The reason is that
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withdrawn from power supply is considerably less than motor current.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
MA860H Microstepping Driver Manual V1.0
Tel: +086 0755-26434369 8 Web Site: www.leadshine.com
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 MA860H can actually operate within 18 ~ 60VAC or +24 ~
+80VDC, 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 18 ~ 55VAC or +24 ~ +75VDC, leaving room for
power fluctuation and back-EMF.
7. Selecting Microstep Resolution and Driver Output Current
This driver uses an 8-bit DIP switch to set microstep resolution, and motor operating current, as
shown below:
Microstep Resolution Selection
Microstep resolution is set by SW5, 6, 7, 8 of the DIP switch
as shown in the following table:
Microstep
Steps/rev.(for 1.8
°
motor)
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
ON
OFF
OFF
ON
256
51200
OFF
OFF
OFF
ON
5
1000
ON
ON
ON
OFF
10
2000
OFF
ON
ON
OFF
