Digital Stepper Drive Hardware Installation Manual
Current Settings
Dynamic current setting
For a given motor, higher drive current will make the motor to output more torque, but at the same time causes more heating in the
motor and drive. 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
drive output current depending on motor phase current, motor leads and connection methods. Phase current rating supplied by motor
manufacturer is important in selecting drive current, however the selection also depends on leads and connections.
Idle current setting
When there is no pulse applied to the DM drive and the time exceeds the idle-time which can be configured via the PC based software,
the drive goes into idle status. SW4 is used to set the idle-current, OFF meaning that the motor coil current is automatic reduced, and
ON meaning that current is the same as the selected dynamic current.
By default, the current automatically reduced to 60% of the selected dynamic current two second after the last pulse. Theoretically, this
will reduce motor heating to 36% (due to P=I
2
*R) of the original value. If the user wants to change the idle time and current reduction
rate, please consult the DM drive’s software manual.
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