Connecting the Controller to Power

The cRIO-904x requires a 9 V to 30 V external power supply. The cRIO-904x filters and regulates the supplied power and provides power for the C Series modules. The cRIO-904x has a primary power input, V1, and a secondary power input, V2.

The POWER LED on the cRIO-904x indicates which power input is in use, as shown in the following table.

Table 1. POWER LED Indicators
LED Color LED Pattern Indication
Green Solid The cRIO-904x is powered from the V1 input.
Yellow Solid The cRIO-904x is powered from the V2 input.
Off The cRIO-904x is off.
Notice Do not connect V1 or V2 to a DC mains supply or to any supply that requires a connecting cable longer than 3 m(10 ft). A DC mains supply is a local DC electricity supply network in the infrastructure of a site or building.

What to Use

  • Ferrite (included in kit)
  • Screwdriver, 2.54 mm (0.10 in.) flathead
  • Primary power supply, 9 V to 30 V, 60 W minimum
  • (Optional) Secondary power supply, 9 V to 30 V, 60 W minimum

NI recommends the power supplies listed in the following table for the cRIO-904x.

Table 2. NI Power Supplies
Power Supply Part Number
NI PS-15 Industrial Power Supply (24 VDC, 5 A, 100 VAC to 120 VAC/200 VAC to 240 VAC input) 781093-01
NI PS-10 Desktop Power Supply (24 VDC, 5 A, 100 VAC to 120 VAC/200 VAC to 240 VAC input) 782698-01

What to Do

Complete the following steps to connect a power supply to the cRIO-904x.

  1. Ensure that your power supply is powered off.
  2. Install the ferrite (National Instruments part number 781233-02, included in the shipping kit) on the negative and positive leads of the power supply, as shown in the following figure.
    Figure 3. Installing a Ferrite on the Power Leads

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    1. Pass the leads through the ferrite twice, leaving 50 mm to 75 mm (2 in. to 3 in.) between the ferrite and the end of the leads.
    2. Close the ferrite around the leads.
  3. Remove the power connector from the cRIO-904x.
    Notice Do not tighten or loosen the terminal screws on the power connector while the cRIO-904x is powered on.
    Figure 4. Power Screw Terminal Connector Plug

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    1. Terminal Screw
    2. Connector Screw Flanges
  4. Connect the primary power supply and optional secondary power supply to the power connector, as shown in the following figure.
    Figure 5. cRIO-904x Power Connections

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    Note The C terminals are internally connected to each other.
  5. Tighten the terminal screws on the power connector to 0.20 N · m to 0.25 N · m(1.8 lb · in to 2.2 lb · in) of torque.
  6. Install the power connector on the front panel of the cRIO-904x.
  7. Tighten the power connector screw flanges to 0.20 N · m to 0.25 N · m(1.8 lb · in to 2.2 lb · in) of torque.
  8. Power on the primary power supply and optional secondary power supply.
    When you power on the cRIO-904x for the first time, the device boots into safe mode. The POWER LED illuminates, the STATUS LED illuminates briefly, and then the STATUS LED blinks twice every few seconds.