2-18 | ni.comChapter 2 Basic FunctionsOverheat Protection (OHP), Overheat Protection2 (OHP2)This protection function is activated when the RMX programmable power supply internaltemperature rises to an abnormal level. Abnormal temperature levels can occur under thefollowing conditions:• When used in an environment outside its operating ambient temperature range0°C (32°F) to 50°C (122 °F)• When used with its air inlet and exhaust port blocked.• When the fan motor has stopped.Figure 2-21. Alarm Indication when OHP2 has been ActivatedIf OHP2 is activated, turn the POWER switch off and on.If you do not fix the problem that caused the OHP or OHP2 to be activated, OHP or OHP2 willbe activated again even if you restart the RMX programmable power supply.Fan Failure Protection (FAN)This function is activated when the number of fan rotations drops to an abnormal level.Figure 2-22. Alarm Indication when FAN has been ActivatedIncorrect Sensing Connection Protection (SENSE)This function is activated when the remote sensing cables are connected with the incorrectpolarity (positive or negative), and the remote sensing function is then used.Figure 2-23. Alarm Indication when SENSE has been ActivatedLow AC Input Protection (AC-FAIL)This function is activated when a low AC input is detected.LitLitLit
