National Instruments Fieldpoint CFP-2220 - Manual (Page 18)

cFP-2200/2210/2220 18 ni.com
Wiring Power to the cFP-22xx
The cFP-22xx requires an external power supply that meets the
specifications in the
Power Requirements section. The cFP-22xx filters and
regulates the supplied power and provides power for all of the I/O modules.
You must connect a power supply to at least one pair of V and C terminals.
Optionally, you can connect a power supply to the other pair of V and
C terminals. The controller draws power from the power supply with the
higher voltage. The controller has one layer of reverse-voltage protection.
Caution In order to comply with standards and laws governing electromagnetic emissions
and compatibility, you must install the ferrite shipped with the controller. If you decide to
connect an optional second power supply, you must install a second, similar ferrite. You
can order the ferrite from
ni.com . The ferrite is NI part number 711849-01.
Complete the following steps to connect power supplies to the controller.
1. Install the ferrite 2–3 in. from the ends of the power wires. Wrap the
wires around one side of the ferrite so that they pass through the ferrite
twice, as shown in Figure 22.
Figure 22. Wrapping the Power Wires around the Ferrite
Figure 23. Closed Ferrite