Fig. 74: The Feedback supervision function
A. Upper limit (ID736)
B. Lower limit (ID758)
C. Actual value
D. Reference
E. Delay (ID737)
F. Regulating mode
G. Alarm or fault
P3.13.6.2 UPPER LIMIT (ID 736)
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.
P3.13.6.3 LOWER LIMIT (ID 758)
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.
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 P3.13.6.4 Delay, an alarm or a fault shows. You can make a selection of the response with
parameter P3.13.6.5 (Response to PID1 Supervision Fault).
P3.13.6.4 DELAY (ID 737)
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.
VACON · 300 PARAMETER DESCRIPTIONS
10
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