Honeywell HVAC400x Applications Manual page 145

P3.13.5.1 ENABLE PROCESS SUPERVISION (ID 735)
A
B
E
A. Upper limit (ID736).
B. Lower limit (ID758).
C. Reference.
D. Actual value.
You can use this parameter to enable the feedback supervision function.
Set the upper limit and the lower limit around the reference. When the actual value is less or more than the limits, a
counter starts to count up. When the actual value is between the limits, the counter counts down. When the counter
gets a value that is higher than the value of P3.13.5.4 Delay, an alarm or a fault shows.
P3.13.5.2 UPPER LIMIT (ID 736)
You can use this parameter to set the high limit for the PID feedback signal.
If the value of the PID feedback signal goes above this limit for longer than the set time, a feedback supervision
fault occurs.
P3.13.5.3 LOWER LIMIT (ID 758)
You can use this parameter to set the low limit for the PID feedback signal.
If the value of the PID feedback signal goes below this limit for longer than the set time, a feedback supervision
fault occurs.
P3.13.5.4 DELAY (ID 737)
You can use this parameter to set the maximum time for the PID feedback signal to stay outside the supervision
limits before the feedback supervision fault occurs.
If the target value is not reached in this time, a fault or alarm shows.
F
Fig. 41. The Feedback supervision function
HVAC400X – APPLICATION MANUAL
D
Legend
E. Delay (ID737).
F. Regulating mode.
G. Alarm or fault.
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