Siemens PANEL PC 877 用户手册

 

Troubleshooting/FAQs 

 

14.3 Temperature limits 

SIMATIC Panel PC 877 
Operating instructions, Release 07/2006, A5E00877780-01 

14-3

 

14.3 

14.3 

Temperature limits 

Cause 

If the device is used for its intended purpose, the temperature threshold values are not 

exceeded or fallen below. When the LED "Temp" on the upper left side of the operator 

control unit lights up, check the following:  
• 

Are the fan apertures covered? 

• 

Has the fan failed (check speed display in the SOM or on the DiagMonitor)? 

• 

Is the ambient temperature higher than the allowed value (see "Technical data")? 

• 

Is the total output of the power supply within the specified limit? 

• 

Are the heatsinks inside the PC covered with dust? 

Remedy 

The temperature error is retained until the temperatures have fallen below the thresholds 

and you have acknowledged the error alarm in the SOM program. Click on the button with 

the "small broom" icon. When the error alarm has been acknowledged, the "TEMP" LED on 

the devices goes off and the title bar and "SOM" icon in the status bar of the SOM program 

changes from red to green. If you have not installed the SOM program or DiagMonitor, you 

must restart the PC.