Honeywell UDC2500 ユーザーズマニュアル

In addition to the error message prompts, there are failure symptoms that can be 
identified by noting how the controller displays and indicators are reacting. 

Compare your symptoms with those shown in Table 7-4. 

Blank Blank  Off  None 

Power 

Failure 1 

OK OK 

Current 

Proportional Output 

2 

OK OK 

Three 

Position 

Step Control 

Output 

3 

OK OK 

Time 

Proportional 

Output 

4 

OK 

Displayed 

Output 

disagrees 

with Controller 

Output 

OK 

Controller 

Output 

disagrees 

with Displayed 

Output 

Current/Time 

Proportional Output 

5 

OK OK OK 

External 

Alarm 

function does 

not operate 

properly 

Malfunction in 

alarm output 

6 

Display does not change when a key is pressed 

Keyboard 

Malfunction 

7 

Controller fails to go into “Slave” operation during communications 

Communications 

Failure 

8 

OK Displayed 

Output 

disagrees with 

Auxiliary Output 

OK 

Controller 

Auxiliary Output 

disagrees 

with Displayed 

Auxiliary Output 

Auxiliary Output 

9 

If a set of symptoms or prompts other than the one you started with appears while 
troubleshooting, re-evaluate the symptoms. This may lead to a different troubleshooting 
procedure.