National Instruments NI 9478

Some applications require a large inrush current when a channel is

first turned on. If this inrush current exceeds the maximum current

limit threshold, you may need to disable overcurrent protection by

programming the channel to have no current limit. Refer to the

software help for more information about configuring current

limits. Visit ni.com/info and enter cseriesdoc for information

about C Series documentation.

Caution The NI 9478 is not protected against output

overcurrent or short-circuit conditions when overcurrent

protection is disabled. If you disable overcurrent

protection, ensure that the wiring is correct and that you

are operating the NI 9478 within the specifications.

The total amount of current that you can switch with a channel

depends on the duty cycle of the channel, the ambient temperature,

the switching frequency, and the amount of current switched by

other channels within the same module at the same time. Refer to

the Safe Operating Current section for more information about the

current specifications.