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NI SMD-7611/7612 User Manual
Regeneration
When a motor rapidly decelerates from high speed under load, the kinetic energy may be
reconverted into electrical energy and transferred back to the power supply. When using
regulated power supplies, this can trip the overvoltage protection and lead to a shutdown, or
cause damage to the system. Unregulated power supplies do not typically have overvoltage
protection, and may store regenerated energy in capacitors.
System Wiring Recommendations
Maintain at least 2 in. separation between the power supply cable and input lines or encoder
feedback. All power supply cables should be properly shielded, and the shield grounded at the
power supply. Signal cables should be shielded, and grounded as close as possible to the signal
source.
Connecting Motors
This section explains how to connect motors to the NI SMD-7611/7612. Refer to your motor
documentation for any special considerations that may affect your configuration.
Caution
Never connect or disconnect the motor while the system is powered on.
Note
Ensure any shield or grounding strap on the motor is connected to the chassis
ground screw located near the motor/power connector.
Figure 4.
Motor/Power Connector
D
ST34-1
7.56
4.8
4.2
4.0
E
ST34-4
7.56
4.4
4.2
4.2
F
ST34-7
6.72
3.5
3.2
3.3
Table 2.
NI SMD-7612 Power Supply Current (Continued)
Switch
Motor
Drive Current (A),
peak of sine
Max Power Supply Current (A)
24 VDC
48 VDC
60 VDC