Honeywell SmartVFD HVAC MR4, User Manual

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HVAC A
PPLICATION
Honeywell
• 58
3.5.14.4 Feedforward
Feedforward usually needs accurate process models, but in some simple cases a gain + offset
type of feedforward is enough. The feedforward part does not use any feedback measurements
of the actual controlled process value (water level in the example on page 77). Feedforward
control uses other measurements which are indirectly affecting the controlled process value.
Table 42.
3.5.14.5 Process supervision
Process supervision is used to control that the actual value stays within predefined limits. With
this function you can e.g. detect a major pipe burst and stop unnecessary flooding. See more
on page 78.
Table 43.
Code Parameter Min Max Unit Default ID Description
M3.12.4.1 Feedforward function 1 9 1 1059 See M3.12.3.1.
M3.12.4.2
Feedforward function
gain
-1000 1000 % 100.0 1060 See M3.12.3.2
M3.12.4.3
Feedforward 1
source selection
0 14 0 1061 See M3.12.3.3
M3.12.4.4
Feedforward 1 mini-
mum
-200.00 200.00 % 0.00 1062 See M3.12.3.4
M3.12.4.5
Feedforward 1 maxi-
mum
-200.00 200.00 % 100.00 1063 See M3.12.3.5
M3.12.4.6
Feedforward 2
source selection
0 14 0 1064 See M3.12.3.6
M3.12.4.7 Feedforward 2 min -200.00 200.00 % 0.00 1065 See M3.12.3.7
M3.12.4.8 Feedforward 2 max -200.00 200.00 % 100.00 1066 See M3.12.3.8
Code Parameter Min Max Unit Default ID Description
M3.12.5.1
Enable process super-
vision
0 1 0 735
0 = Disabled
1 = Enabled
M3.12.5.2 Upper limit Varies Varies Varies Varies 736
Upper actual/process value
supervision
M3.12.5.3 Lower limit Varies Varies Varies Varies 758
Lower actual/process value
supervision
M3.12.5.4 Delay 0 30000 s 0 737
If the desired value is not
reached within this time a
fault or alarm is created.