Danfoss VLT HVAC Design Manual page 38

2 Introduction to VLT HVAC Drive
1. Start/Stop via switch connected between terminals 12 (+24 V) and 18.
2. Temperature reference via a potentiometer (-5 to +35°C, 0 10 V)
connected to terminals 50 (+10 V), 53 (input) and 55 (common).
3. Temperature feedback via transmitter (-10-40°C, 4-20 mA) connected
2
to terminal 54. Switch S202 behind the LCP set to ON (current input).
2.8.9 Programming Order
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 frequency converter limits are set to safe values
Check that the ramp settings are within capabilities of the
drive and allowed application operating specifications.
Prohibit the motor from reversing (if necessary)
Set acceptable limits for the motor speed.
Switch from open loop to closed loop.
4) Configure the feedback to the PID controller.
Select the appropriate reference/feedback unit.
5) Configure the set-point reference for the PID controller.
Set acceptable limits for the set-point reference.
Choose current or voltage by switches S201 / S202
6) Scale the analog inputs used for set-point reference and feedback.
Scale Analog Input 53 for the pressure range of the potenti-
ometer (0 - 10 Bar, 0 - 10 V).
Scale Analog Input 54 for pressure sensor (0 - 10 Bar, 4 - 20
mA)
7) Tune the PID controller parameters.
Adjust the drive's Closed Loop Controller, if needed.
8) Finished!
Save the parameter setting to the LCP for safe keeping
38
Par. no. Setting
1-2* As specified by motor name plate
Enable complete AMA
1-29
1-28 If the motor runs in the wrong direction, remove power
temporarily and reverse two of the motor phases.
3-41 60 sec.
3-42 60 sec.
Depends on motor/load size!
Also active in Hand mode.
Clockwise
4-10
4-12 10 Hz,
4-14 50 Hz,
4-19 50 Hz,
Closed Loop
1-00
20-12 Bar [71]
20-13 0 Bar
20-14 10 Bar
6-10 0 V
6-11 10 V (default)
6-14 0 Bar
6-15 10 Bar
6-22 4 mA
6-23 20 mA (default)
6-24 0 Bar
6-25 10 Bar
20-93 See Optimization of the PID Controller, below.
20-94
0-50 All to LCP
MG.11.B9.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC Drive Design Guide
[1] and then run the AMA function.
[0]
Motor min speed
Motor max speed
Drive max output frequency
[3]
[1]