Pid Control Application; Introduction To Pid Control Application - Danfoss VACON NX All-in-One Application Manual

VACON® NX All-in-One
Application Guide

6 PID Control Application

6.1 Introduction to PID Control Application

Select the PID Control Application in menu M6 on page S6.2.
In the PID Control Application, there are two I/O terminal control places; place A is the PID controller and source B is the direct
frequency reference. The control place A or B is selected with digital input DIN 6.
The PID controller reference can be selected from the analog inputs, fieldbus, motorized potentiometer, enabling the PID Reference
2 or applying the keypad reference. The PID controller actual value can be selected from the analog inputs, fieldbus, the actual
values of the motor or through the mathematical functions of these.
The direct frequency reference can be used for the control without the PID controller and selected from the analog inputs, fieldbus,
motor potentiometer, or keypad.
The PID Application is typically used to control level measuring or pumps and fans. In these applications, the PID Application pro-
vides a smooth control and an integrated measuring and controlling package where no additional components are needed.
• Digital inputs DIN 2, DIN 3, DIN 5 and all the outputs are freely programmable.
Extra functions:
• Analog input signal range selection
• Two frequency limit supervisions
• Torque limit supervision
• Reference limit supervision
• Second ramps and S-shape ramp programming
• Programmable start and stop functions
• DC brake at start and stop
• Three prohibit frequency areas
• Programmable U/f curve and switching frequency
• Auto restart
• Motor thermal and stall protection: fully programmable; off, warning, fault
• Motor underload protection
• Input and output phase supervision
• Sum point frequency addition to PID output
• The PID controller can be also used from control places I/O B, keypad, and fieldbus
• Easy ChangeOver function
• Sleep function
The parameters of the PID Control Application are explained in Chapter Parameter descriptions of this manual. The explanations are
arranged according to the individual ID number of the parameter.
60 | Danfoss A/S © 2023.02
PID Control Application
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