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VLT
®
HVAC Drive Programming Guide
20-30 Refrigerant
Option:
[0] *
R22
[1]
R134a
[2]
R404a
[3]
R407c
[4]
R410a
[5]
R502
[6]
R744
[7]
User-defined
20-31 User-defined Refrigerant A1
Range:
10.0000 N/
[8.0000 - 12.0000 N/A]
A*
20-32 User-defined Refrigerant A2
Range:
-2250.00 N/
[-3000.00 - -1500.00 N/A]
A*
20-33 User-defined Refrigerant A3
Range:
250.000 N/
[200.000 - 300.000 N/A]
A*
3.18.5 20-7* PID autotuning
The adjustable frequency drive PID closed-loop controller (parameters 20-**, Adjustable Frequency Drive Closed-loop) can be autotuned, simplifying and
saving time during commissioning, while ensuring accurate PID control adjustment. To use autotuning, it is necessary for the adjustable frequency drive
to be configured for closed-loop in par.1-00
A graphical local control panel (LCP) must be used in order to react on messages during the autotuning sequence.
Enabling par.20-79
PID Auto Tuning
The fan/pump is started by pressing [Auto On] button on the LCP and applying a start signal. The speed is adjusted manually by pressing the [
▼
[
] navigation keys on the LCP to a level where the feedback is around the system setpoint.
Function:
Select the refrigerant used in the compressor application. This parameter must be specified correctly
for the pressure to temperature conversion to be accurate. If the refrigerant used is not listed in
choices [0] through [6], select
User-defined Refrigerant A2
20-32
A3 for the equation below:
Temperature
=
(
Function:
Use this parameter to enter the value of coefficient A1 when par.20-30
defined
[7].
Function:
Use this parameter to enter the value of coefficient A2 when par.20-30
defined
[7].
Function:
Use this parameter to enter the value of coefficient A3 when par.20-30
defined
[7].
Configuration Mode
.
, puts the adjustable frequency drive into autotuning mode. The LCP then directs the user with on-screen instructions.
MG.11.C6.22 - VLT
®
is a registered Danfoss trademark
User defined
[7], use par.20-31
User-defined Refrigerant A3
and par.20-33
A
2
A
−
3
ln
(
Pe
+ 1 ) −
A
1 )
3 Parameter Description
User-defined Refrigerant A1
, par.
to provide A1, A2 and
Refrigerant
User-
is set to
Refrigerant
User-
is set to
Refrigerant
is set to
User-
▲
] or
3-177
3
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