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Technical Details
Ndrive HP 10/20/30 User’s Manual
3-24
www.aerotech.com
3.6.3. Operation
In the Voltage-to-Current mode, the Ndrive acts as a simple voltage-to-current controller.
Analog Input 0 provides the current/torque command. Analog input 0 is accessible
through either the -IOPSO option board or the J205 connector.
To emulate a standalone drive, the Ndrive also uses Input #8 (least-significant input bit
on the J205 connector) as a drive enable input, and Output #8 (least-significant output bit
on the J205 connector) as a fault output indicator. These I/O points utilize a default
polarity that makes them fail-safe. Both are optically isolated. See Figure 3-2 and
Figure 3-3 for I/O connection information. Also, note that the fault output requires a pull-
up resistor to an external power supply.
The analog input is configured to accept input voltages from -10V to +10V. In this mode,
+10V is equivalent to peak amplifier current command in the negative (CCW) direction,
while –10V is equivalent to peak amplifier current command in the positive (CW)
direction. The drives peak current is defined by the drive part number (i.e. Ndrive HL 20
indicates that the peak output current will be 20 amps.)
The analog input is differential, utilizing pins J205-13 (Analog input 0+) and J205-14
(Analog input 0-). See Figure 4-8 for more information.
The diagrams above indicate that current flow through pins
17 and 24 will enable the axis to drive current through the
motor (failsafe; by default, no motor current will be
present). Also, they indicate that a fault condition will be
indicated by no current flow from pin 7 to pin 15 through
the fault output (failsafe; by default, no current flow
indicates a drive fault. When the drive is powered up and
no fault condition exists, the opto-isolator will conduct
current).
3.6.4. Faults
A Drive Fault in the standalone mode can be caused by any of the following issues:
!
Drive Over-Current (Peak current commanded for 1 second)
!
Motor
Over-Current (RMS threshold)
!
Thermistor Over-Temperature Fault (Motor)
!
Amplifier Temperature Fault
!
Loss of Bus Power
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