Danfoss VLT Series Design Manual page 35

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VLT HVAC Drive Design Guide
Function
1) Make sure the motor runs properly. Do the following:
Set the drive to control the motor based on
drive output frequency.
Set the motor parameters using nameplate
data.
Run Automatic Motor Adaptation.
2) Check that the motor is running in the right direction.
Press the "Hand On" LCP key and the ^ key
to make the motor turn slowly. Check that
the motor runs in the correct direction.
3) Make sure the frequency converter limits are set to safe values
Check that the ramp settings are within ca-
pabilities of the drive and allowed applica-
tion operating specifications.
Prohibit the motor from reversing (if nec-
essary)
Set acceptable limits for the motor speed. 4-12
Switch from open loop to closed loop.
4) Configure the feedback to the PID controller.
Set up Analog Input 54 as a feedback input. 20-00
Select the appropriate reference/feedback
unit.
5) Configure the setpoint reference for the PID controller.
Set acceptable limits for the setpoint refer-
ence.
Set up Analog Input 53 as Reference 1
Source.
6) Scale the analog inputs used for setpoint reference and feedback.
Scale Analog Input 53 for the temperature
range of the potentiometer (-5 to +35°C,
0-10 V).
Scale Analog Input 54 for the temperature
range of the temperature sensor (-10 to
+40°C, 4-20 mA)
7) Tune the PID controller parameters.
Select inverse control because motor's
speed should increase when the feedback
is greater than the setpoint reference.
Adjust the drive's Closed Loop Controller, if
needed.
8) Finished!
Save the parameter setting to the LCP for
safe keeping
Par. no.
0-02
1-2*
1-29
3-41
3-42
4-10
4-14
4-19
1-00
20-12
3-02
3-03
3-15
6-10
6-11
6-14
6-15
6-22
6-23
6-24
6-25
20-81
20-93
20-94
0-50
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MG.11.B2.02 - VLT is a registered Danfoss trademark
2. Introduction to VLT HVAC Drive
Setting
Hz
[1]
As specified by motor name plate
Enable complete AMA
[1] and then run the
AMA function.
If the motor runs in the wrong direction,
remove power temporarily and reverse
two of the motor phases.
60 sec.
60 sec.
Depends on motor/load size!
Also active in Hand mode.
Clockwise
[0]
10 Hz
50 Hz
50 Hz
Closed Loop [3]
Analog input 54
[2] (default)
°C
[60]
-5 °C
35 °C
Analog input 53
[1] (default)
0 V
10 V (default)
-5 °C
35 °C
4 mA
20 mA (default)
-10 °C
40 °C
Inverse [1]
See Optimization of the PID Controller,
below.
All to LCP
[1]
2
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