Danfoss VLT HVACDrive, Instruction Manual

Page: 120 / 180

22-20 Low Power Auto Set-up
Start of auto set-up of power data for No-Flow Power tuning.
Option: Function:
[0] * OFF
[1] Enabled When set for Enabled , an auto set-up sequence is activated, automatically setting speed to approx.
50% and 85% of rated motor speed (par. 4-13 Motor Speed High Limit [RPM] , par. 4-14 Motor
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
Configuration
Mode
).
Note that it is important also to set par. 1-03
Torque Characteristics
.
NOTE!
Auto set-up must be done when the system has reached normal operating temperature!
NOTE!
It is important that the par. 4-13 Motor Speed High Limit [RPM] or par. 4-14 Motor Speed High Limit [Hz] is set to the max. operational
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
Configuration Mode .
NOTE!
Carry out the tuning with the same settings in par. 1-03 Torque Characteristics , as for operation after the tuning.
22-21 Low Power Detection
Option: Function:
[0] * Disabled
[1] Enabled 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!
22-22 Low Speed Detection
Option: Function:
[0] * Disabled
[1] Enabled Select Enabled for detecting when the motor operates with a speed as set in par. 4-11
Motor Speed
Low Limit [RPM]
or par. 4-12
Motor Speed Low Limit [Hz]
.
7 How to Program the Adjustable Frequency
Drive VLT ® HVAC Drive Instruction Manual
7-42
MG.11.AB.22 - VLT ® is a registered Danfoss trademark
7