Power Connector

The NI 9155 has a power connector to which you can connect a primary and secondary power supply. The following table shows the pinout for the power connector.

Table 1. Power Connector Pinout
Pinout Pin Description
1378 V1 Primary power input
C Common
V2 Secondary power input
C Common
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 specifications on ni.com/manuals for information about the power supply input range and maximum voltage from terminal to chassis ground.

If you apply power to both the V1 and V2 inputs, the NI 9155 operates from the V1 input. If the input voltage to V1 is insufficient, the NI 9155 operates from the V2 input.

The NI 9155 has reverse-voltage protection.

The following NI power supplies and accessories are available for the NI 9155.

Table 2. Power Accessories
Accessory Part Number
NI PS-15 Power Supply, 24 VDC, 5 A, 100-120/200-240 VAC Input 781093-01
NI PS-10 Desktop Power Supply, 24 VDC, 5 A, 100-120/200-240 VAC Input 782698-01