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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
.
8-lead motor parallel connections
7.
Power Supply Selection
The Microstep Driver can match Large and small size stepping motors (from Nema size 17 to Nema
size 34). To achieve good driving performances, it is important to select supply voltage and output
current properly. 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.
SMPS or Linear Power Supply
Both SMPS and Linear power supplies can be used to supply the driver. However, Linear power
supplies are preferred due to their ability to withstand current surge. If SMPS 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. On the other hand, if Linear 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 Linear supply only during the ON
duration, but not during the OFF duration. Therefore, the average current withdrawn from power
supply is considerably less than motor current
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).
8. Troubleshooting
a. The status on light’s indication
RUN: green, normal work light.
ERROR: red, failure light, the motor with phase short-circuit, overvoltage and undervoltage
protection.
NOTE:
TO CHECK IF DRIVE IS OK/NOT OK, CONNECT ONLY SUPPLY (AC /DC) VOLTAGE AND
GROUND TO THE MICROSTEP DRIVE AND CHECK THE LED INDICATOR IF IT SHOWS
GREEN THEN DRIVE IS OK AND IF THE LED INDICATOR SHOWS RED THEN DRIVE IS
NOT OK. THIS TEST SHOULD BE DONE WHEN THE BELOW TROUBLE SHOOTING IS
CARRIED AND MOTOR IS NOT RUNNING.
