Low Power Auto Set-Up; Low Power Detection; Low Speed Detection - Danfoss VLT HVACDrive Instruction Manual

7 How to Program the Adjustable Frequency
Drive

22-20 Low Power Auto Set-up

Start of auto set-up of power data for No-Flow Power tuning.
Option:
[0] * OFF
[1] Enabled
NOTE!
Auto set-up must be done when the system has reached normal operating temperature!
7
NOTE!
It is important that the par. 4-13
speed of the motor!
It is important to do the auto set-up before configuring the integrated PI controller as settings will be reset when changing from closed
to open-loop in par. 1-00
NOTE!
Carry out the tuning with the same settings in par. 1-03

22-21 Low Power Detection

Option:
[0] * Disabled
[1] Enabled

22-22 Low Speed Detection

Option:
[0] * Disabled
[1] Enabled
7-42
Function:
Enabled
When set for , an auto set-up sequence is activated, automatically setting speed to approx.
50% and 85% of rated motor speed (par. 4-13
Speed High Limit [Hz]
). At those two speeds, the power consumption is automatically measured
and stored.
Before enabling Auto Set-up:
1. Close valve(s) in order to create a no-flow condition
2. The adjustable frequency drive must be set for open-loop (par. 1-00
Mode
).
Note that it is important also to set par. 1-03
Motor Speed High Limit [RPM]
Configuration Mode
.
Torque Characteristics
Function:
If selecting Enabled, the low power detection commissioning must be carried out in order to set the
parameters in group 22-3* for proper operation!
Function:
Select Enabled for detecting when the motor operates with a speed as set in par. 4-11
Low Limit [RPM]
or par. 4-12
MG.11.AB.22 - VLT ®
VLT ® HVAC Drive Instruction Manual
Motor Speed High Limit [RPM]
Torque Characteristics
or par. 4-14 Motor Speed High Limit [Hz]
, as for operation after the tuning.
Motor Speed Low Limit [Hz]
.
is a registered Danfoss trademark
Motor
, par. 4-14
Configuration
.
is set to the max. operational
Motor Speed