2.
Remove the grounding screw from the grounding terminal on the right side of the chassis.
3.
Attach the ring lug to the grounding terminal.
4.
Tighten the grounding screw to 0.5 N · m (4.4 lb · in.) of torque.
5.
Attach the other end of the wire to the grounding electrode system of your facility using a
method appropriate for the application.
Caution
If you use shielded cabling to connect to a C Series I/O module with
a plastic connector, you must attach the cable shield to the chassis grounding
terminal using 1.3 mm
2
(16 AWG) or larger wire. Attach a ring lug to the wire
and attach the wire to the chassis grounding terminal. Solder the other end of
the wire to the cable shield. Use shorter wire for better EMC performance.
For more information about ground connections, go to
and enter the Info
Code
emcground
.
Wiring Power to the Chassis
The cRIO-9072/9073/9074 requires an external power supply that meets the specifications in
the
section. The cRIO-9072/9073/9074 filters and regulates the supplied
power and provides power for all of the I/O modules. The cRIO-9072/9073/9074 has one layer
of reverse-voltage protection. Complete the following steps to connect a power supply to the
chassis.
1.
Connect the positive lead of the power supply to the V terminal of the power connector
shipped with the cRIO-9072/9073/9074, and tighten the terminal screw. The following
figure shows the terminal screws, which secure the wires in the screw terminals, and the
connector screws, which secure the power connector on the front panel.
Figure 11.
Power Connector
C
NC
C
V
2
1
2
1. Terminal Screws
2. Connector Screws
2.
Connect the negative lead of the power supply to one of the C terminals of the power
connector and tighten the terminal screw.
3.
Optionally, you can connect the positive lead of another power supply to the other V
terminal and the negative lead to one of the C terminals.
4.
Install the power connector on the front panel of the cRIO-9072/9073/9074 and tighten
the connector screws.
NI cRIO-9072/9073/9074 User Manual and Specifications
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© National Instruments
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