PST5056 User Manual
REV1.0 13
11.4 Protection Indications
Priority
Time(s) of ON
Sequence wave of RED LED
Description
1
st
1
Over-current protection
2
nd
2
Over-voltage protection
3
rd
4
Phase error protection
12. Frequently Asked Questions
In the event that your stepper drive PST5056 doesn’t operate properly, the first step is to
identify whether the problem is electrical or mechanical in nature. The next step is to isolate
the system component that is causing the problem. As part of this process you may have to
disconnect the individual components that make up your system and verify that they operate
independently. It is important to document each step in the troubleshooting process. You may
need this documentation to refer back to at a later date, and these details will greatly assist
our Technical Support staff in determining the problem should you need assistance.
Many of the problems that affect motion control systems can be traced to electrical noise,
controller software errors, or mistake in wiring.
PST5056 User Manual
REV1.0 14
12.1 Symptoms and Possible Causes
Symptoms
Possible Problems
Motor is not rotating
No power
Microstep resolution setting is wrong
DIP switch current setting is wrong
Fault condition exists
The driver is disabled
Motor rotates in the wrong
direction
Motor phases may be connected in reverse
The driver in fault
DIP switch current setting is wrong
Something wrong with motor coil
Erratic motor motion
Control signal is too weak
Control signal is interfered
Wrong motor connection
Something wrong with motor coil
Current setting is too small, losing steps
Motor stalls during
acceleration
Current setting is too small
Motor is undersized for the application
Acceleration is set too high
Power supply voltage too low
Excessive motor and driver
heating
Inadequate heat sinking / cooling
Automatic current reduction function not being utilized
Current is set too high
