WEG CFW100 Programming Manual page 145

P920
It defines that the control setpoint source in automatic mode of the PID controller will be the value programmed in parameter P911
0
via HMI of the frequency inverter or written via communication networks
It defines that the control setpoint source in automatic mode of the PID controller will be the value read by the analog input AI1.
1
The value is converted according to the engineering unit 1 and viewed in parameter P911
It defines that the control setpoint source in automatic mode of the PID controller will be the value read by the analog input AI2.
2
The values is converted according to the engineering unit 1 and viewed in parameter P911
It defines that the control setpoint source in automatic mode of the PID controller will be the value defined through the electronic
3 potentiometer function via the Increase Setpoint (DI3) and Decrease Setpoint (DI4) commands. The value of the count is
stored in parameter P911
It defines that there will be two control setpoints in automatic mode of the PID controller selected via logical combination of
4
digital input DI3. The selected control setpoint value is viewed in parameter P911
It defines that there will be three control setpoints in automatic mode of the PID controller selected via logical combination of
5
digital inputs DI3 and DI4. The selected control setpoint value is viewed in parameter P911
It defines that there will be four control setpoints in automatic mode of the PID controller selected via logical combination of
6
digital inputs DI3 and DI4. The selected control setpoint value is viewed in parameter P911
When the control setpoint is via logical combination of digital inputs DI3 and DI4 (P920 = 4, 5 or 6), the following
truth table must be used so as to obtain the control setpoint of the PID controller in automatic mode.
Figure 14.3 on page 14-9
setpoint value (P911) is incremented, and when digital input DI4 is activated, the control setpoint value (P911) is
decremented. In case both digital inputs are activated at the same time, the value remains the same.
DI3 - increase SP
DI4 - decrease SP
P911 - (control setpoint)
DI3 - increase SP
DI4 - decrease SP
Motor running (RUN)
When the control setpoint is via logical combination of digital inputs DI3 and DI4 (P920 = 4, 5 or 6), the following
truth table must be used so as to obtain the control setpoint of the PID controller in automatic mode.
Table 14.6: Truth table for the control setpoint via logical combination of digital inputs DI3 and DI4
Digital input DI3
Digital input DI4
Table 14.5: Description of the control setpoint source
shows the operation of the EP function: when digital input DI3 is activated, the control
Ramp for
setpoint
Active
Inactive
Figure 14.3: PID controller block diagram
P912 – Control P913 – Control
Setpoint 1 Setpoint 2
0
0
Description
P911 - (control setpoint)
Inactive
Active
Sleep
(A750)
P914 – Control
Setpoint 3
1 0
0 1
APPLICATIONS
Time
Time
Time
Time
P915 – Control
Setpoint 4
1
1
Micro Mini Drives | 14-9
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