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NI ISM-7400 User Manual
Regeneration
If you plan to use a regulated power supply you may encounter a problem with regeneration. If
you rapidly decelerate a load from a high speed, much of the kinetic energy of that load is
transferred back to the power supply. This can trip the overvoltage protection of a switching
power supply, causing it to shut down. Unregulated power supplies are better suited for
applications with significant regeneration as they generally do not have overvoltage protection
and have large capacitors for storing energy coming back from the drive. Refer to
Connecting
the Power Supply
for more information.
Connecting Input Signals
The NI ISM-7400 has three inputs:
•
STEP
—High-speed digital input for step pulse commands, 5 V to 24 V logic
•
DIR—
High-speed digital input for the direction signal, 5 V to 24 V logic
•
EN
—5 V to 24 V input for commanding the removal of power from the motor
Note
To convert STEP and DIR inputs to STEP CW and STEP CCW, move switch
#8 to the ON position. Refer to
Step Pulse Type
for more information.