Servo Drive Modes - National Instruments UMI-7774 User Manual

Vcc
UMI-7774/7772

Servo Drive Modes

© National Instruments Corporation
Chapter 3
Current Limiter
Figure 3-20. Use of External Flyback Diode for Inductive Loads
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.
Connecting the UMI-7774/7772 to Drives and Other Devices
Viso
Current
Sense
Digital Output
Ciso
3-31 National Instruments UMI-7774/7772 User Manual
Load
External Flyback
Diode for
Inductive Loads