MC860H High Performance Digital Stepper Driver MC860H High Performance Digital Stepper Driver
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In order to improve anti-interference performance of the Driver, it is recommended
to usetwisted pair shield cable.
To prevent noise incurred in PUL/DIR signal, pulse/direction signal wires and motor
wiresshould not be tied up together. It is better to separate them by at least 10 cm,
otherwise thedisturbing signals generated by motor will easily disturb pulse
direction signals, causing motorposition error, system instability and other failures.
If a power supply serves several Drivers, separately connecting the Drivers is
recommendedinstead of daisy-chaining.
It is prohibited to pull and plug connector P2 while the Driver is powered ON,
because there ishigh current flowing through motor coils (even when motor is at
standstill). Pulling or pluggingconnector P2 with power on will cause extremely high
back-EMF voltage surge, which maydamage the Driver.
9. Protection Functions
To improve reliability, the Driver incorporates some built-in protection functions.
The MC556uses one RED LED to indicate what protection has been activated. The
periodic time of RED is 3s (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 Driver will decide what errorto display according to
their priorities. See the following Protection Indications table fordisplaying priorities.
Over-current Protection
Over-current protection will be activated when continuous current exceeds 16A or
in case of shortcircuit between motor coils or between motor coil and ground, and
RED LED will turn on oncewithin each periodic time (3 s).
Over-voltage Protection
When power supply voltage exceeds 90±1 VDC or 80±1 VAC , protection will be
activated and RED LED will turn on twice within each periodic time (3 s).
Motor power lines wrong & not connected will activate this protection. RED LED will
turn on four times within each periodic time (3 s).
Attention: When above protections are active, the motor shaft will be free or the LED
will turn red.Reset the Driver 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 powersupply leads correctly connected to
Driver. Otherwise, the Driver will be damaged instantly.
10. Frequently Asked Questions
In the event that your Driver 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
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