National Instruments NI 9475 Detecting an Overcurrent Condition

Higher inrush currents that exist for less than the trip time do not

trip the protection circuitry. Refer to the Specifications section for

more information about the maximum continuous output current,

short-circuit behavior, and short-circuit trip time. You also can

refer to the IEC 1131-2 standard for more information about

short-circuit-proof devices.

Tip Because the NI 9475 includes internal flyback

diodes, you do not need to add external diodes when

connecting to switching energy storing devices.

If a short-circuit occurs, the current through DO can exceed the

current rating for the power supply and the maximum continuous

output current for the NI 9475.

If the power supply you are using with the NI 9475 cannot supply

more than 13 A, the module may be damaged if a short-circuit

condition occurs.

Detecting an Overcurrent Condition

If a device connected to the module is not working while the

channel is on, the module channel may be in an overcurrent state.

Neither the software nor the module LEDs indicate if an