67
Programming
Example for using the Offset function:
Constant pressure system with required value of 70 PSI.
Additionally a flow sensor is connected to the Offset input.
Parameter [907] - Offset Range = 300 (maximum range of flow sensor = 70 GPM)
System requirement 1:
5 bar constant pressure while the flow rate is between 20 GPM and 50 GPM.
Below 20 GPM the pressure should be decreased to maximum 36 PSI at a flow rate of 8 GPM.
Settings:
Parameter [0910] - Level 1 = 50 = 20 GPM (first limit where the offset function is active)
Parameter [0912] - Offset X1 = 20 = 8 GPM (fixed point according the requirements)
Parameter [0913] - Offset Y1 = 2.5 = 36 PSI (max. allowed pressure at this flow rate)
System requirement 2:
70 PSI constant pressure while the flow rate is between 20 GPM and 50 GPM.
Above the 50 GPM the pressure should be increased with the limitation to have maximum 87 PSI at maxi-
mum flow rate of 16m³/h.
Settings:
Parameter [915] - Level 2 = 120 = 50 GPM (second limit where the offset function is active)
Parameter [917] - Offset X2 = 160 = 16m³/h (fixed point according the requirements)
Parameter [918] - Offset Y2 = 6 = 87 PSI (required pressure at this flow rate)
2 m
3
/h
5 m
3
/h 12 m
3
/h
OFFSET X2
OFFSET X1
OFFSET Y1
OFFSET Y2
Level 1 Level 2
Offset
0 20 40 60 80 100 120 140 160
0
2
4
6
8
10
12
14
16
Required Value
Required
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