DM422C Digital Stepping Driver Manual V1.0
Tel: +000 0000-00000000
5
4. Control Signal Connector (P1) Interface
The DM422C uses opto-couplers to increase noise immunity and interface flexibility. If the
opto-couplers
’
supply voltage is higher than +5V, a current-limiting resistor needs to be connected
at each command signal terminal to prevent overheating the opto-couplers. In the following
figures, connections to open-collector and differential controller are illustrated.
Figure 2: Connections to open-collector signal (common-anode)
Figure 3: Connections to differential control signal
5. Connecting the Motor
The DM422C can drive any 2-phase and 4-phase hybrid stepping motors.
DM422C Digital Stepping Driver Manual V1.0
Tel: +000 0000-00000000
6
Connections to 4-lead Motors
4 lead motors are the least flexible but easiest to wire. Speed and torque will depend on winding
inductance. In setting the Drive output current, multiply the specified phase current by 1.4 to
determine the peak output current.
Figure 4: 4-lead Motor Connections
Connections to 6-lead Motors
Like 8 lead stepping motors, 6 lead motors have two configurations available for high speed or high
torque operation. The higher speed configuration, or half coil, is so described because it uses one half
of the motor
’
s inductor windings. The higher torque configuration, or full coil, uses the full windings
of the phases.
Half Coil Configurations
As previously stated, the half coil configuration uses 50% of the motor phase windings. This gives
lower inductance, hence, lower torque output. Like the parallel connection of 8 lead motor, the torque
output will be more stable at higher speeds. This configuration is also referred to as half chopper. In
setting the Drive output current multiply the specified per phase (or unipolar) current rating by 1.4 to
determine the peak output current.
Figure 5: 6-lead motor half coil (higher speed) connections
Full Coil Configurations
The full coil configuration on a six lead motor should be used in applications where higher torque at
lower speeds is desired. This configuration is also referred to as full copper. In full coil mode, the
motors should be run at only 70% of their rated current to prevent over heating.
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