Honeywell UDC2500 ユーザーズマニュアル

Read the Installation section in this manual to make sure the UDC2500 has been properly 
installed. The installation section provides information on protection against electrical 
noise, connecting external equipment to the controller, and shielding and routing external 
wiring. 

 ATTENTION  

 System noise induced into the controller will result in diagnostic error 

messages recurring. If the diagnostic error messages can be cleared, it indicates a “soft” 
failure and is probably noise related. 

If system noise is suspected, completely isolate the controller from all field wiring.  
Use calibration sources to simulate PV and check all controller functions; i.e. Gain, Rate, 
Reset, Output, Alarms, etc. 

Review the application of the controller; then, if necessary, direct your questions to the 
local sales office. 

Use the troubleshooting error message prompts and controller failure symptoms to 
identify typical failures which may occur in the controller. Follow the troubleshooting 
procedures to correct them. 

An error message can occur: 

• At power-up. See Subsection 7.3. 
• When the Status Tests are requested. See Subsection 7.4. 
• During continuous background tests while in normal operation. See Subsection 7.5. 

Other failures may occur that deal with the Power, Output, or Alarms. Refer to the 
controller failure symptom in Table 7-4 to determine what is wrong and the 
troubleshooting procedures to use to correct the problem. 

If a set of symptoms still persists, refer to Section 2 - Installation and ensure proper 
installation and proper use of the controller in the system.