The output channels and the auxiliary power input of the PXIe-4151 are protected against overcurrent, overvoltage, inverse voltage, and over-temperature conditions.

Output Channel Protection

The output channel on the PXIe-4151 is overcurrent-protected. In the event of an overcurrent condition, the channel enters current compliance mode. The channel has cycle-by-cycle current limiting and additional over-current protection on the external power input that protects the channel in the event of a current compliance mode failure. In the event that an inverse voltage is applied to the channel, a reverse protection diode prevents damage to the channel. A thermal overload circuit protects this diode by engaging the output disconnect feature in the event of an inverse voltage with large current capability.

Caution Each output channel of the PXIe-4151 can withstand the application of an external voltage up to 10 V beyond the rated output level. Applying an external voltage greater than 10 V beyond the rated output level can damage the output channel.

In the event of an over-temperature condition (that is, the enclosure or component temperatures exceed safe operating limits), the thermal shutdown circuits on the PXIe-4151 disable the output channel that indicated the failure condition, disable all other channels, disable external power, and disconnect the outputs. When disabled, an output channel can only be reset programmatically after the failure condition is cleared.

Auxiliary Input Protection

The auxiliary power input of the PXIe-4151 can accept voltages up to 52.8 V. Applying a voltage above 52.8 V disables the auxiliary power input.

This device is overvoltage protected >52.8 V. Refer to the PXIe-4151 Specifications for more information about overvoltage protection for this device.

In the event of an overcurrent (>30 A) or an inverse voltage condition, the auxiliary power input fuse may blow to protect the PXIe-4151 and the load.