Installing the Auxiliary 48 V Power Source on the PXIe-4112

Complete the following steps to install the auxiliary 48 V power source on the module PXIe-4112 and prepare it for use.
  1. Connect the power source to the auxiliary power input connector on the PXIe-4112 front panel.
    Figure 8. Connecting the Required 48 V Power Source

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    Table 7. Signal Descriptions
    Signal Description
    Terminal 0 + Positive Auxiliary Power Input
    Terminal 1 - Negative Auxiliary Power Input
  2. Tighten the screws to hold the auxiliary 48 V power source in place.
    Note An auxiliary 48 V power source is required to operate the PXIe-4112. NI recommends using a power source that is greater than 3.5 A. The auxiliary power source provided by NI uses sufficient wire gauge to maintain voltage requirements for the device. If you use a third-party auxiliary power source, you must use the appropriate wire gauge to ensure that it can provide the required device current without dropping below the minimum voltage at the auxiliary power input connector

Resuming Operation After Auxiliary Power Loss

In case of auxiliary power loss during operation, the isolated outputs (both channels) are disabled, and the power supply is shut down to prevent damage to the PXIe-4112 and the load. If auxiliary power loss occurs, complete the following steps to resume operation:

  1. Troubleshoot the failure.
    • Verify that all connections, including the front panel connections to the output channels and auxiliary power supply, are secure.
    • Verify that the output channels are enabled. If necessary, use the niDCPower Configure Output Enabled VI or the niDCPower_ConfigureOutputEnabled function to enable the output channels. Also verify that the Source:Output Connected property is set to TRUE or the NIDCPOWER_ATTR_OUTPUT_CONNECTED function is set to VI_TRUE.
    • Inspect the auxiliary input fuse and verify that it is in working condition. If necessary, replace any blown fuses.
  2. Restore auxiliary power.
  3. Reset the power supply using the niDCPower Reset VI or the niDCPower_reset function.
  4. Reconfigure the power supply.