Danfoss vlt FC 102 Programming Guide

Depending on the system being controlled, the time
required to carry out PID auto-tuning could be several
minutes.
Before activating the PID auto-tuning, remove excessive
feedback sensor noise using the input lter (parameter
groups 5-5* Pulse Input, 6-** Analog In/Out and 26-** Analog
I/O Option MCB 109, terminal 53/54 lter time constant,
and pulse lter time constant #29/33).
21-00 Closed Loop Type
Option: Function:
This parameter denes the
application response. The default
mode should be sucient for most
applications. If the relative
application speed is known, it can
be selected here. This decreases the
time needed for carrying out PID
auto-tuning. The setting has no
impact on the value of the tuned
parameters and is used only for the
PID auto-tuning sequence.
[0] * Auto
[1] Fast Pressure
[2] Slow Pressure
[3] Fast
Temperature
[4] Slow
Temperature
21-01 PID Performance
Option: Function:
[0] * Normal Normal setting of this parameter is
suitable for pressure control in fan
systems.
[1] Fast Fast setting would generally be
used in pumping systems, where a
faster control response is desirable.
21-02 PID Output Change
Range: Function:
0.10* [0.01 - 0.50 ] This parameter sets the magnitude
of step change during auto tuning.
The value is a percentage of full
operating range. That is, if the
maximum analog output voltage is
set to 10 V, 0.10 is 10% of 10 V,
which is 1 V. Set this parameter to
a value resulting in feedback
changes of 10–20% for best tuning
accuracy.
21-03 Minimum Feedback Level
Range: Function:
-999999* [ -999999.999
- par. 21-04 ]
Enter the minimum allowable
feedback level in user units as
dened in:
•
Parameter 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL
1.
•
Parameter 21-30 Ext. 2 Ref./
Feedback Unit for EXT CL
2.
•
Parameter 21-50 Ext. 3 Ref./
Feedback Unit for EXT CL
3.
If the level drops below
parameter 21-03 Minimum Feedback
Level, PID auto-tuning is aborted,
and an error message appears in
the display.
21-04 Maximum Feedback Level
Range: Function:
999999* [ par. 21-03 -
999999.999 ]
Enter the maximum allowable
feedback level in user units as
dened in:
•
Parameter 21-10 Ext. 1 Ref./
Feedback Unit for EXT CL
1.
•
Parameter 21-30 Ext. 2 Ref./
Feedback Unit for EXT CL
2.
•
Parameter 21-50 Ext. 3 Ref./
Feedback Unit for EXT CL
3.
If the level rises above
parameter 21-04 Maximum Feedback
Level, PID auto tuning is aborted,
and an error message appears in
the display.
Parameter Descriptions Programming Guide
M0010001 Danfoss A/S © 10/2019 All rights reserved. 189
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Danfoss vlt FC 102 Specifications

General

Brand	Danfoss
Model	vlt FC 102
Category	DC Drives
Language	English