Honeywell SmartVFD HVAC MR4 User Manual page 130

HVAC A
PPLICATION
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.
Code Parameter
M3.12.4.1 Feedforward function
Feedforward function
M3.12.4.2
gain
Feedforward 1
M3.12.4.3
source selection
Feedforward 1 mini-
M3.12.4.4
mum
Feedforward 1 maxi-
M3.12.4.5
mum
Feedforward 2
M3.12.4.6
source selection
M3.12.4.7 Feedforward 2 min
M3.12.4.8 Feedforward 2 max
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.
Code Parameter
Enable process super-
M3.12.5.1
vision
M3.12.5.2 Upper limit
M3.12.5.3 Lower limit
M3.12.5.4 Delay
Min Max Unit
1 9
-1000 1000 %
0 14
-200.00 200.00 %
-200.00 200.00 %
0 14
-200.00 200.00 %
-200.00 200.00 %
Table 42.
Min Max Unit
0 1
Varies Varies Varies
Varies Varies Varies
0 30000 s
Table 43.
Default ID Description
1 1059 See M3.12.3.1.
100.0 1060 See M3.12.3.2
0 1061 See M3.12.3.3
0.00 1062 See M3.12.3.4
100.00 1063 See M3.12.3.5
0 1064 See M3.12.3.6
0.00 1065 See M3.12.3.7
100.00 1066 See M3.12.3.8
Default ID Description
0 = Disabled
0 735
1 = Enabled
Upper actual/process value
Varies 736
supervision
Lower actual/process value
Varies 758
supervision
If the desired value is not
0 737 reached within this time a
fault or alarm is created.
Honeywell • 58