Protection
The output channels and the auxiliary power input of the NI PXI-4110 are protected against overcurrent, overvoltage, inverse voltage, and overtemperature conditions.
Output Channel Protection
All output channels on the NI PXI-4110 are current-limited and fused. In the event of an overcurrent, overvoltage, or inverse voltage condition, an output channel fuse may blow to protect the NI PXI-4110 and the load. When its fuse is blown, an output channel can source only a few milliamperes of current regardless of the programmed current limit.
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Caution Each output channel of the NI PXI-4110 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 overtemperature condition (that is, the enclosure or component temperatures exceed safe operating limits), the thermal shutdown circuits on the NI PXI-4110 disable the output channel that indicated the failure condition. 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 NI PXI-4110 can accept voltages from 11 V to 15.5 V. Applying a voltage below 11 V or above 15.5 V disables the auxiliary power input.
In the event of an overvoltage condition (that is, applying voltages >20 V to the auxiliary power input), crowbar protection is enabled. Crowbar protection shunts the auxiliary power input to ground.
In the event of an overcurrent (>6.3 A) or an inverse voltage condition, the auxiliary power input fuse may blow to protect the NI PXI-4110 and the load. You can use the niDCPower Auxiliary Power Source Available property or the NIDCPOWER_ATTR_AUXILIARY_POWER_SOURCE_AVAILABLE attribute to troubleshoot the auxiliary power input fuse.