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]
.
22-23 No-Flow Function
Common actions for Low Power Detection and Low Speed Detection (Individual selections not possible).
Option: Function:
[0] * OFF
[1] Sleep Mode The drive will enter sleep mode and stop when a No Flow condition is detected. See parameter
group 22-4* for programming options for sleep mode.
[2] Warning The drive will continue to run, but activate a No-Flow Warning [W92]. A drive digital output or a
serial communication bus can communicate a warning to other equipment.
[3] Alarm The drive will stop running and activate a No-Flow Alarm [A 92]. A drive digital output or a serial
communication bus can communicate an alarm to other equipment.
NOTE!
Do not set par. 14-20
Reset Mode
to [13] Infinite auto reset when par. 22-23
No-Flow Function
is set to [3] Alarm. Doing so will cause
the drive to continuously cycle between running and stopping when a No Flow condition is detected.
NOTE!
If the drive is equipped with a constant speed bypass with an automatic bypass function that starts the bypass if the drive experiences
a persistent alarm condition, be sure to disable the bypass’ automatic bypass function, if [3] Alarm is selected as the No-Flow Function.
VLT AQUA Low Harmonic Drive Instruction
Manual
6 How to Program the Low Harmonic Drive
MG.20.T1.22 - VLT
®
is a registered Danfoss trademark
6-35
6
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