vacon • 42 Startup
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4.2.5 PID Control application
You can use the PID control application with processes where you control the process variable (for
example pressure) through control of the speed of the motor.
In this application, the internal PID controller of the drive is configured for 1 setpoint and 1 feedback
signal.
It is possible to use 2 control places. Make the selection of the control place A or B with DI6. When
control place A is active, the start/stop commands are given by DI1, and the PID controller gives the
frequency reference. When control place B is active, start/stop commands are given by DI4, and AI1
gives the frequency reference.
It is possible to configure all the drive outputs freely in all the applications. There are 1 analogue
output (Output Frequency) and 3 relay outputs (Run, Fault, Ready) available on the basic I/O board.
4.2.5.1 M1.34 PID Control
Table 18. PID Control start-up wizard menu
Code Parameter Min Max Unit Default ID Description
P1.34.1 Gain 0.00 1000.00 % 100.00 118
If the value of the parameter
is set to 100% a change of
10% in the error value
causes the controller output
to change by 10%.
P1.34.2 Integration Time 0.00 600.00 s 1.00 119
If this parameter is set to
1,00s a change of 10% in the
error value causes the con-
troller output to change by
10.00%/s.
P1.34.3 Derivation Time 0.00 100.00 s 0.00 132
If this parameter is set to
1,00s a change of 10% in the
error value during 1.00 s
causes the controller output
to change by 10.00%.
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