Danfoss vlt FC 102 Programming Guide

20-79 PID Autotuning
Option: Function:
tuning, this parameter is reset to [0]
Disabled.
[0] * Disabled
[1] Enabled Enables PID auto-tuning.
3.18.6 20-8* PID Basic Settings
This parameter group is used to congure the basic
operation of the PID controller, including:
•
Response to feedback above or below the
setpoint.
•
The speed at which it rst starts functioning.
•
When it indicates that the system has reached
the setpoint.
20-81 PID Normal/ Inverse Control
Option: Function:
[0] * Normal The frequency converter’s output
frequency decreases when the
feedback is greater than the
setpoint reference. This behaviour is
common for pressure-controlled
supply fan and pump applications.
[1] Inverse The frequency converter’s output
frequency increases when the
feedback is greater than the
setpoint reference. This behaviour is
common for temperature-controlled
cooling applications, such as
cooling towers.
20-82 PID Start Speed [RPM]
Range: Function:
Size
related*
[ 0 - par. 4-13
RPM]
NOTICE
This parameter is only visible if
parameter 0-02 Motor Speed
Unit is set to [0] RPM.
When the frequency converter is
rst started, it initially ramps up to
this output speed in open-loop
mode, following the active ramp-up
time. When the output speed
programmed is reached, the
frequency converter automatically
switches to closed-loop mode and
the PID controller begins to
function. This is useful in
applications that require quick
acceleration to a minimum speed at
start-up.
20-83 PID Start Speed [Hz]
Range: Function:
Size
related*
[ 0 - par. 4-14
Hz]
NOTICE
This parameter is only visible if
parameter 0-02 Motor Speed
Unit is set to [1] Hz.
When the frequency converter is
rst started, it initially ramps up to
this output frequency in open-loop
mode, following the active ramp-up
time. When the output frequency
programmed is reached, the
frequency converter automatically
switches to closed-loop mode and
the PID controller begins to
function. This is useful in
applications that require quick
acceleration to a minimum speed at
start-up.
20-84 On Reference Bandwidth
Range: Function:
5 %* [0 - 200 %] When the dierence between the
feedback and the setpoint reference
is less than the value of this
parameter, the frequency
converter’s display shows Run on
Reference. This status can be
communicated externally by
programming the function of a
digital output for [8] Run on
Reference/No Warning. Also, for
serial communications, the On
Reference status bit of the
frequency converter status word is
high (value = 1).
The On Reference Bandwidth is
calculated as a percentage of the
setpoint reference.
3.18.7 20-9* PID Controller
This group provides the ability to manually adjust the PID
controller. By adjusting the PID controller parameters, the
control performance may be improved. See the VLT
®
HVAC
Drive FC 102 Design Guide for guidelines on adjusting the
PID controller parameters.
Parameter Descriptions
VLT
®
HVAC Drive FC 102
186 Danfoss A/S © 10/2019 All rights reserved. M0010001
33

Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English