HVAC A
PPLICATION
Honeywell
• 78
Figure 19. Feedforward control
M3.12.5.1
E
NABLE
PROCESS
SUPERVISION
Figure 20. Process supervision
Upper and lower limits around the reference are set. When the actual value goes above or be-
low these a counter starts counting up towards the Delay (M3.12.5.4). When the actual value
is within the allowed area the same counter counts down instead. Whenever the counter is
higher than the Delay an alarm or fault (depending on the selected response) is generated.
PID
+
+
LT
FT
100K20.fh11
FFW
Level ref
Level control
Outflow
control
100K21.fh11
Regulating mode
Upper limit
M3.12.5.2)
Lower limit
(M3.12.5.3)
Actual value
Delay (M3.12.5.4)
Alarm or fault
Reference
Summary of Contents for SmartVFD HVAC MR4
Page 7: ...Honeywell 5 SAFETY ...
Page 49: ...Honeywell 47 COMMISSIONING ...
Page 78: ...STARTUP Honeywell 6 ...