MC860H High Performance Digital Stepper Driver MC860H High Performance Digital Stepper Driver
13 14
Steps/rev.(for 1.8
°
motor)
◆ Current Settings
For a given motor, higher driver current will make the motor to output more torque, but
at the same time causes more heating in the motor and driver. Therefore, output current
is generally set to be such that the motor will not overheat for long time operation. Since
parallel and serial connections of motor coils will significantly change resulting
inductance and resistance, it is therefore important to set driver output current
depending on motor phase current, motor leads and connection methods. Phase current
rating supplied by motor manufacturer is important in selecting driver current, however
the selection also depends on leads and connections.
The first three bits (SW1, 2, 3) of the DIP switch are used to set the dynamic current.
Select a setting closest to your motor
’
s required current.
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