CN0170 HARDWARE MANUAL
5 VDC: (pin 3)
The 5 VDC output is provided to act as a power supply for STEP and DIR
opto-isolators on step motor drives that feature isolated inputs. The 5 VDC
line should connect to the opto-isolator LED anodes. Depending on the
step motor drive, these may be individual inputs, or they may be tied in
common to a single input. Current then flows from the 5 VDC output,
through the opto-isolator LED and current limit resistor, and into the
STEP or DIR output on the CN0170.
GND: (pins 6-9)
The ground pins on the connector outputs are arranged so they alternate
with the signal pins if a ribbon cable is used to connect the CN0170 to the
step motor drives. This attenuates cross-talk and provides shielding for the
signal lines. It is also useful if the motor drives are a substantial distance
from the CN0170.
For best noise immunity and reliable operation, the step motor drives
should be opto-isolated. To maintain this isolation, do not terminate the
GND lines to the motor drive or power supply.
When the CN0170 is used with motor drives that do not have opto-isolated
inputs, the GND outputs are the signal return lines for the CN0170 STEP
and DIR outputs.
CONNECTING CENTENT DRIVES TO THE CN0170:
The CN0170 interfaces directly to Centent CN0124, CN0142, CN0143,
CN0152, CN0153, CN0162 and CN0165 step motor drives. The CN0170
also interfaces directly to the Centent CN0182 servo drive.
Figure 7
Figure 7 provides connection diagrams for CN0142, CN0143, CN0152 and
CN0153 step motor drives with and without the STANDBY function. R1 is
the current set resistor and R2 is the STANDBY resistor. R2 may be
replaced with a wire jumper if motor current is off during standby. This
allows the motor to "freewheel" with no holding torque evident. R2 is not
used and ISET or IRET are not connected if current standby is not
required.
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Summary of Contents for CN0170
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