Operating instructions

10 | ni.com | NI cRIO-9030 Operating Instructions and Specifications

Figure 3. Installing a Ferrite on the Power Leads

3. Loosen the connector screw flanges and remove the power screw terminal connector plug

from the cRIO controller. Figure 4 shows the terminal screws, which secure the wires in the

screw terminals, and the connector screw flanges, which secure the connector plug on the

front panel.

Figure 4. Power Screw Terminal Connector Plug

Caution Do not tighten or loosen the terminal screws on the power connector while

the power is on.

4. Connect the positive lead of the primary power source to the V1 terminal of the power

connector plug and tighten the terminal screw to 0.20 to 0.25 N · m (1.8 to 2.2 lb · in.) of

torque.

5. Connect the negative lead of the power supply to one of the C terminals of the power

connector and tighten the terminal screw to 0.20 to 0.25 N · m (1.8 to 2.2 lb · in.) of torque.

6. Optionally, you can connect the positive lead of another power supply to the V2 terminal

and the negative lead to the other C terminal.

Caution The C terminals are internally connected to each other, but are not

connected to chassis ground. This isolation is intended to prevent ground loops and

does not meet UL ratings for safety isolation. You can connect the C terminals to

chassis ground externally. Refer to the Power Requirements section for information

about the power supply input range. Refer to the Safety Voltages section for

information about the maximum voltage from terminal to chassis ground.

1 Terminal Screw 2 Connector Screw Flanges