MC556 High Performance Microstepping Driver
MC556 High Performance Microstepping Driver
13
14
Peak Current
RMS Current
SW1
SW2
SW3
1.40A
1.0A
OFF
OFF
OFF
2.10A
1.5A
ON
OFF
OFF
2.70A
1.9A
OFF
ON
OFF
3.20A
2.3A
ON
ON
OFF
3.80A
2.7A
OFF
OFF
ON
4.30A
3.1A
ON
OFF
ON
4.90A
3.5A
OFF
ON
ON
5.60A
4.0A
ON
ON
ON
Notes:
Due to motor inductance, the actual current in the coil may be smaller than the
dynamic current setting, particularly under high speed condition.
◆
Standstill current setting
SW4 is used for this purpose. OFF meaning that the standstill current is set to be half of
the selected dynamic current, and ON meaning that standstill current is set to be the same
as the selected dynamic current.
The current automatically reduced to 60% of the selected dynamic current one second
after the last pulse. Theoretically, this will reduce motor heating to 36% (due to P=I2*R)
of the original value. If the application needs a different standstill current, please contact
Lichuan.
8. Wiring Notes
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 52±1 VDC, protection will be activated and
RED LED will turn on twice within each periodic time (3 s).
Phase Error Protection
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.