A feature was introduced in NI System Configuration 16.0 to allow users to programmatically change the fan speed control to a third mode, Safe Manual mode, on the PXIe-1085, PXIe-1086, and PXIe-1066DC chassis. Safe Manual mode allows the user to set a speed, in rpm, at which the fans should run. Your chassis' fan speed selector switch must be in Auto mode in order to utilize this mode. If the speed selector switch is set to High, the fans will continue to run at High regardless of the configured Safe Manual settings.
Note: If you set the speed below the maximum supported by your chassis, the fans will run above the user-defined speed if the intake air temperature necessitates it.
Use of this feature requires the following two properties within the System Configuration API:
|Speed, in rpm, that the fans should run at||Int*|
*The PXIe-1085 supports a maximum fan speed of 4600 rpm. The PXIe-1086 and PXIe-1066DC support a maximum fan speed of 3800 rpm.
NISysCfgSetResourceProperty functions to get or set the current value of these properties. Call
NISysCfgSaveResourceChanges after setting these properties to write and save the property changes to the device. Once saved, these settings will persist between reboots. See the NI System Configuration API help that gets installed with the software for more information on using these functions.
Similar functionality was introduced for LabVIEW in NI System Configuration 18.0. You can take advantage of this functionality by dropping a System Configuration Property Node onto the Block Diagram of your VI, and finding the appropriate properties in: System Resources >> Fans >> PXI Chassis Fan Control.
To get access to these properties, complete the following steps:
nisyscfg_pxi.hin your source code. These files are installed at:
C:\Program Files (x86)\National Instruments\Shared\ExternalCompilerSupport\C\include\
Application Software: LabWindows/CVI Full Development System 2017
Hardware Group: PXI/CompactPCI