Danfoss VLT FC 102 Series Design Manual page 46

Introduction to VLT® HVAC D...
2 2
Figure 2.31 Example of Closed-loop PID Control
2.8.11 Programming Order
NOTICE!
In this example, it is assumed that an induction motor is
used, i.e., that 1-10 Motor Construction = [0] Asynchron.
Function
1) Make sure the motor runs properly. Do the following:
Set the motor parameters
using nameplate data.
Run Automatic Motor
Adaptation.
2) Check that the motor is running in the right direction.
Run Motor Rotation
Check.
3) Make sure the adjustable frequency drive limits are set to safe
values.
44
Design Guide
Para-- Setting
meter
1-2* As specified by motor
nameplate
1-29 [1] Enable complete AMA
and then run the AMA
function
1-28 If the motor runs in the
wrong direction, remove
power temporarily and
reverse two of the motor
phases
Danfoss A/S © Rev. 06/2014 All rights reserved.
Function Para--
meter
Check that the ramp 3-41
settings are within 3-42
capabilities of the
adjustable frequency drive
and allowed application
operating specifications.
Prohibit the motor from 4-10
reversing (if necessary).
Set acceptable limits for 4-12
the motor speed. 4-14
4-19
Switch from open-loop to 1-00
closed-loop.
4) Configure the feedback to the PID controller.
Select the appropriate 20-12
reference/feedback unit.
5) Configure the setpoint reference for the PID controller.
Set acceptable limits for 20-13
the setpoint reference. 20-14
Select current or voltage by switches S201 / S202.
6) Scale the analog inputs used for setpoint reference and
feedback.
Scale Analog Input 53 for 6-10
the pressure range of the 6-11
potentiometer (0–10 Bar, 6-14
0–10 V). 6-15
Scale Analog Input 54 for 6-22
pressure sensor (0–10 Bar, 6-23
4–20 mA). 6-24
6-25
7) Tune the PID controller parameters.
Adjust the adjustable 20-93
frequency drive's closed- 20-94
loop controller, if needed.
8) Save to finish.
Save the parameter 0-50
settings to the LCP for
safekeeping.
Table 2.15 Programming Order
Setting
60 s
60 s
Depends on motor/load
size!
Also active in hand
mode.
[0] Clockwise
10 Hz, Motor min speed
50 Hz, Motor max speed
50 Hz, Drive max output
frequency
[3] Closed-loop
[71] Bar
0 Bar
10 Bar
0 V
10 V (default)
0 Bar
10 Bar
4 mA
20 mA (default)
0 Bar
10 Bar
See Optimization of the
PID Controller, below
[1] All to LCP
MG11BC22