Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
©
National Instruments Corporation
3-31
National Instruments UMI-7774/7772 User Manual
Figure 3-20.
Use of External Flyback Diode for Inductive Loads
Servo Drive Modes
National Instruments recommends that when you use the UMI-7774/7772
with a servo motor drive, you use the torque (current) mode option on the
drive instead of the velocity mode to simplify the system setup and tuning.
In torque mode, only the current loop is closed on the drive. Both the
position and velocity loops are closed on the motion controller using
encoder feedback.
When you use torque mode, you can set all of the control gains with the
National Instruments motion controller software. Using torque mode on the
drive also reduces noise and enables you to achieve high position
repeatability in the motion system.
Refer to the documentation included with the drive system for more
information about the drive.
Digital Output
Viso
Ciso
Vcc
Current Limiter
Current
Sense
UMI-7774/7772
External Flyback
Diode for
Inductive Loads
Load
