Protection Fuctions; Over-Current Protection; Over-Voltage Protection; Phase Error Protection - Motion DMD870 User Manual

DMD870 Digital Stepper Drive User's Manual

11. PROTECTION FUCTIONS

To improve reliability, the DMD870 stepper drive incorporates some built-in protection
functions. It uses one RED LED to indicate what protection has been activated. The periodic
time of RED is 3 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 16A 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 (3s).

Over-voltage Protection

When power supply voltage exceeds 91±1 VDC, protection will be activated and RED LED
will turn on twice within each periodic time (3s).

Phase Error Protection

Motor power lines wrong & not connected will activate this protection. RED LED will turn
on four times within each periodic time (3s).
Attention: When above protections are active, the motor shaft will be free or the LED will turn red.
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.
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