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4. Control Signal Connector (P1) Interface
The DM870 can accept differential and single-ended inputs (including open-collector and PNP
output). The DM870 has 3 optically isolated logic inputs which are located on connector P1 to accept
line Drive control signals. These inputs are isolated to minimize or eliminate electrical noises coupled
onto the drive control signals. Recommend use line Drive control signals to increase noise immunity
of the Drive in interference environments. In the following figures, connections to open-collector and
PNP signals are illustrated.
Figure 2: Connections to open-collector signal (common-anode)
Figure 3: Connection to PNP signal (common-cathode)
5. Connecting the Motor
The DM870 can drive any 2-pahse and 4-pahse hybrid stepping motors.
Connections to 4-lead Motors
4 lead motors are the least flexible but easiest to wire. Speed and torque will depend on winding
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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.
Figure 6: 6-lead motor full coil (higher torque) connections
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