It is important to note that digital output capacities can be configured in any order, for instance: 20%, 40%,
10%, and30%for outputs OUT1 to OUT4.
5.5 Control Mode 4 - Analog and digital outputs with linear
activation
In this mode the drive of the digital outputs will always be after the analog output reaches its maximum
value (100%). The activation sequence of digital loads will be linear as in the item 5.2. Because this
operation mode uses the digital and analog outputs, the hysteresis that the controller consider will be the
sum of the functions: ”hysteresis of digital outputs” and “hysteresis of analogic output”.
When the operation mode is in depressurize, the controller works to decrease the read pressure until
reaches setpoint value. If it is working in the pressurize mode, the controller works to increase the read
pressure until reaches setpoint value.
If the Start / Stop function is enabled. The drive will take place when the pressure reaches the value for
each step even if the analog output does not reach 100%, the first digital output starts to act as control for
enabling a frequency inverter. At depressurize mode, if the read pressure is less than or equal to the
setpoint, the OUT 1 output will be with the relay off, otherwise, if the read pressure is greater than the
setpoint, the OUT 1 output will be with the relay on.
Setpoint: 30 psi
Hysteresis of digital outputs: 20 psi
Number of stages: 4
Hysteresis of analog output: 25 psi
5.2 Control Mode 1 - Only digital outputs with linear activation
The digital outputs will be used in this control mode, and thus the controller will assume only the hysteresis
value configured in the function: "digital output hysteresis." The controller will add digital outputs as the
pressure deviates from the setpoint. The activation point for each output is calculated in accordance with
the hysteresis value and the number of stages configured.
Example:
Setpoint: 30 psi
Hysteresis of digital outputs: 8 psi
Number of stages: 4
In this example the step for each digital output is 2 psi (8 psi divided by 4). The first digital stage will be
activated when the pressure reaches 32 psi (setpoint plus step), the second at 34 psi (setpoint plus 2 times
the step), the third at 36 psi (setpoint plus 3 times the step) and the fourth at 38 psi (setpoint plus 4 times
the step). Please note that at 38 psi (setpoint plus digital hysteresis) all digital outputs will be on.
Example 2: Using the same values as in example 1.
Pressurize
Start/Stop Off
Example 4: Using the same values as in example 1.
Pressurize
Start/Stop On
Example 3: Using the same values as in example 1.
Depressurize
Start/Stop On
25%
0%
50%
75 %
100%
Setpoint
-5 psi
-10 psi
-15 psi
Measured
pressure
Analog
output
+5 psi
Setpoint
-15 psi
-10 psi
-5 psi
-20 psi
-20 psi
-25 psi
25%
0%
50%
75 %
100%
Setpoint
+5 psi
+10 psi
+15 psi
+20 psi
+25 psi
Measured
pressure
Analog
output
OUT1
(Start Stop)
-5 psi
+20 psi
+15 psi
+10 psi
+5 psi
+5 psi
Setpoint
Digital
ouputs
25%
0%
50%
75 %
100%
Setpoint
+5 psi
+10 psi
+15 psi
Measured
pressure
Analog
output
OUT1
(Start Stop)
+5 psi
Setpoint
-15 psi
-10 psi
-5 psi
+20 psi
-20 psi
-25 psi
Digital
ouputs
5.3 Control Mode 2 - Only digital outputs with activation by time
(rotation)
Similarly to the previous mode, only the digital outputs will be used, and thus the controller will assume
only the hysteresis value configured in the function: "digital output hysteresis." In this mode the digital
outputs are controlled in accordance with the number of working hours, so that for switching on a new
stage the controller checks which one has the least working time, and for switching off one stage it checks
which one has the most working hours. This is aimed at ensuring balance in the operating time of the
digital outputs.
Example:
Setpoint: 30 psi
Hysteresis of digital outputs: 8 psi
Number of stages: 4
5.4 Control Mode 3 - Only digital outputs with activation by
capacities
The digital outputs will be used in this control mode, and thus the controller will assume only the hysteresis
value configured in the function: "digital output hysteresis."
The activation point for each output is calculated in accordance with the output capacity and the number of
stages configured. The activation will occur in accordance with the demand of the system, and the
controller will always activate the set with the smallest number of outputs meeting the current demand.
The calculation of the demand is made considering the following formula:
+ 2 psi
+ 4 psi
+ 6 psi
+ 8 psi
Setpoint
OUT1
OUT1+OUT2
OUT1+OUT2+OUT3
OUT1+OUT2+OUT3+OUT4
Hysteresis
Time
Setpoint
OUT1
OUT1+OUT2
OUT1+OUT2+OUT3
OUT1+OUT2+OUT3+OUT4
OUT2+OUT3+OUT4
OFF
Hysteresis
Time
OUT3+OUT4
OUT4
+ 2 psi
+ 4 psi
+ 6 psi
+ 8 psi
Measured pressure - Setpoint
Hysteresis total
x 100
Demand (%) =
Example:
Capacity of digital output 1 (OUT1):10%
Capacity of digital output 2 (OUT2):20%
Capacity of digital output 3 (OUT3):30%
Capacity of digital output 4 (OUT4):40%
Setpoint: 10 psi
Hysteresis of digital outputs: 10 psi
The performance levels of each digital output will be:
Measured pressure = 11 (demand of 10%)
→
OUT1
Measured pressure = 12 (demand of 20%)
→
OUT2
Measured pressure = 13 (demand of 30%)
→
OUT3
Measured pressure = 14 (demand of 40%)
→
OUT4
Measured pressure = 15 (demand of 50%)
→
OUT2+OUT3
Measured pressure = 16 (demand of 60%)
→
OUT2+OUT4
Measured pressure = 17 (demand of 70%)
→
OUT3+OUT4
Measured pressure = 18 (demand of 80%)
→
OUT1+OUT3+OUT4
Measured pressure = 19 (demand of 90%)
→
OUT2+OUT3+OUT4
Measured pressure = 20 (demand of 100%)
→
OUT1+OUT2+OUT3+OUT4
OUT4
OUT3
OUT2
OUT1
Time
Time
Digital
ouputs
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Demand
Setpoint
Digital hysteresis
Number of stages
Step =
Pressure to activate the output "N"
Activation = Se (N x Step)
Pressure to deactivate the output "N"
Activation = Se ((N-1) x Step)
Outputs activation step
Step = Digital hysteresis
Number of stages
