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Vcc
UMI-7774/72
Servo Drive Modes
National Instruments recommends that when you use the UMI-7774/72 with a servo motor drive, you
configure the drive to use use the torque (current) mode instead of velocity mode to simplify system
setup and tuning. When the drive is in torque mode, the NI motion controller closes the position and
velocity loops and the drive only closes the current loop.
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.
Specifications
The following specifications apply only to the UMI-7774/72. Consider the specifications for the
NI motion controller you are using to obtain a complete system specification for the UMI-7774/72.
Refer to the controller specifications to determine overall system specifications.
Some signals have compatibility defined as signal pass-through. This means the UMI-7774/72 may have
passive filtering on these signals, but the passive filtering does not affect the voltage range or current
handling capability. Consult the motion controller specifications to determine the allowable voltage
range and logic level compatibility of the signal.
The following specifications are typical for temperatures from 0 to 55 °C unless otherwise noted.
NI UMI-7774/72 User Guide and Specifications
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Current Limiter
Figure 29. Use of External Flyback Diode for Inductive Loads
34
Viso
Current
Sense
Digital Output
Load
Ciso
External Flyback
Diode for
Inductive Loads
ni.com
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