Danfoss VLT HVAC Series, Programming Manual, Page: 222 / 338

22-20 Low Power Auto Set-up
Option: Function:
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 .
[0] * OFF
[1] Enabled
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]
.
3 Parameter Description VLT ® HVAC Drive Programming Guide
3-198
MG.11.C6.22 - VLT ® is a registered Danfoss trademark
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