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10
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Therefore, the average current withdrawn from power supply is considerably less than motor current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.
