Protection
The output channels and the auxiliary power input of the NI PXI-4130 are protected against overcurrent, overvoltage, inverse voltage (CH 0 only), and overtemperature conditions.
Output Channel Protection
Both output channels on the NI PXI-4130 are current-limited, and channel 0 has a user-replaceable fuse. In the event of an overcurrent, overvoltage, or inverse voltage condition, this fuse may blow to protect the NI PXI-4130 and the load. When its fuse is blown, channel 0 can source only a few milliamperes of current regardless of the programmed current.
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Caution Channel 0 can withstand the application of an external voltage up to 16 V. Applying an external voltage >16 V can damage the output channel. |
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Caution Channel 1 can withstand the application of an external voltage up to 50 V. Applying an external voltage >50 V can degrade or 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-4130 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-4130 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-4130 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.