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NI ISM-7400 User Manual
T
he NI ISM-7400 contains an internal fuse that connects to the power supply positive (+)
terminal. This fuse is not user-replaceable. If you want to install a user-replaceable fuse in your
system, install a fast acting 2 A fuse in line with the positive (+) power supply lead. Figure 3
shows the NI ISM-7400 connections.
Figure 3.
NI ISM-7400 Connector
Caution
Do not reverse the wires. Reverse connection will damage your drive and
void your warranty.
When you rapidly decelerate a load from a high speed, much of the kinetic energy of that load
transfers back to the power supply. This transfer can trigger the overvoltage protection of a
switching power supply, causing it to shut down. Unregulated power supplies generally do not
have overvoltage protection and have large capacitors for storing energy coming back from the
drive. NI offers the SMD-7700 regeneration clamp, part number 748908-01, to solve this
problem.
Choosing a Power Supply
NI offers two power supplies for the NI ISM-7400:
•
NI PS-12 (24 V, 6.3 A)
•
NI PS-13 (48 V, 6.7 A)
Voltage
Your motor can provide more torque at higher speeds if you use a higher power supply voltage.
Refer to the speed-torque curves for more information.
Note
If you choose an unregulated power supply, ensure the no-load voltage of the
supply does not exceed 50 VDC.