en – Original instructions
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6.6 Technical references
6.6.1 Example: ACT control mode with analog input
The diagram of the ACT control mode is shown in the figure.
No.
Description
1
ZERO point (0Vdc - 4mA) = minimum analog signal value
2
Adjustment start point
3
Standby point (SBY) = 1/3 of the hysteresis zone
4
ON point (ON) = 2/3 of the hysteresis zone
5
MAX point (10Vdc - 2mA) = maximum analog signal value
6
Motor minimum speed (Parameter P27)
7
Motor maximum speed (Parameter P26)
8
Adjustment zone
3 - 4 - 2
Minimum speed operation zone (Parameter P27)
1 to 2
Hysteresis zone
1 - 3 - 4
Standby zone
For further information on the control mode and the ACT regulation parameters, see Par. 6.5.3.
and 6.5.5
Examples:
Calculation of the adjustment start point
for P40 = ISP (4-20 mA analog signal)
•
P27 = 900
•
P26 = 3600
•
Calculation of the adjustment start point value = (maximum value
- zero point) x (P27/P26) + zero point = (20-4) x (900/3600) + 4 = 8
mA
Calculation of the adjustment start point
for P40 = VSP (0-10 Vdc analog signal)
•
P27 = 900
•
P26 = 3600
•
Calculation of the adjustment start point value =
(maximum value - zero point) x (P27/P26) + zero point = (10-0) x
(900/3600) + 0 = 2.5 V
