MODEL
10.2 FAULT CONDITIONS
Three classes of error conditions/problems are detected and differentiated between by the diagnostic program. System disabling problems are faults caused by failures in the loop or significant variations in the process. System
10.2.1 DISABLING FAULTS
1.Both FAULT and HOLD annunciation fields will become active (see Figure
2.The process variable will flash at the rate of 1 sec- ond ON and 1 second OFF.
3.The appropriate fault message alternates with the normal Temperature/Current output display (see Figure
A | ♥ |
|
F |
|
|
U | '""" | µS/cm |
T | ||
L |
|
|
H |
|
|
O |
|
|
L |
|
|
D |
|
|
CALIBRATE PROGRAM DIAGNOSE
“ [ 5 P 1 ! 2 - 5 [ ” ! ! !
E X I T N E X T E N T E R
FIGURE 10-2. Disabling Fault Annunciation
SECTION 10.0
DIAGNOSIS AND TROUBLESHOOTING
4.The output current loop will be forced to the
5.A
10.2.2NON- DISABLING WARNINGS
When a
If more than one fault exists, the display will sequence through each diagnostic message. This will continue until the cause of the fault has been corrected.
♥
'""" µS/cm
CALIBRATE PROGRAM DIAGNOSE
“ 5 P : V U ! @ M - S P ” !
E X I T N E X T E N T E R
FIGURE
77