Digital Stepper Drive Hardware Installation Manual
11. Protection Functions
To improve reliability, the drive incorporates some built-in protection functions. The DM drive uses one RED LED to indicate what
protection has been activated. The periodic time of RED is 3 or 5 s (seconds), and how many times the RED turns on indicates what
protection has been activated. Because only one protection can be displayed by RED LED, so the drive will decide what error to
display according to their priorities. See the following Protection Indications table for displaying priorities.
Over-current Protection
Over-current protection will be activated when continuous current exceeds the limit or in case of short circuit between motor coils or
between motor coil and ground, and RED LED will turn on once within each periodic time.
Over-voltage Protection
When power supply voltage exceeds the limit, protection will be activated and RED LED will turn on twice within each periodic time.
Phase Error Protection
Motor power lines wrong & not connected will activate this protection. RED LED will turn on four times within each periodic time.
Note:
When above protections are active, the motor shaft will be free or the LED will blink. Reset the drive by repowering it to make it
function properly after removing above problems. Since there is no protection against power leads (﹢,﹣) reversal, it is critical to make
sure that power supply leads correctly connected to drive. Otherwise, the drive will be damaged instantly.
Protection Indications
Priority Time(s) of Blink Sequence wave of RED LED Description
1st
1
0.2S
3S
Over-current Protection
2nd
2
0.2S 0.3S
3S
Over-voltage Protection
3rd
3
0.2S 0.3S
3S
Low-voltage Protection
4th
4
0.2S 0.3S
3S
Phase Error Protection
5th
5
0.2S 0.3S
3S
Motor Stall Protection
13
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