Step 3. Activate the Auto-tune
Performing an auto tune will ensure optimum
performance. The auto tune measures the values from the
motor model equivalent diagram.
1.
Activate the auto tune
1-29 Automatic Motor
Adaptation (AMA)
.
2.
Choose between complete or reduced auto-tune.
If a sine-wave filter is mounted, run only the
reduced auto-tune, or remove the sine-wave filter
and run complete Auto-tune.
3.
Press the [OK] key. The display shows “Press
[Hand] to start”.
4.
Press the [Hand] key. A progress bar indicates if
the auto tune is in progress.
Stop the Auto Tune during operation
1.
Press the [OFF] key - the adjustable frequency
drive enters into alarm mode and the display
shows that the Auto Tune was terminated by the
user.
Successful Auto Tune
1.
The display shows “Press [OK] to finish Auto
Tune”.
2.
Press the [OK] key to exit the Auto Tune state.
Unsuccessful Auto Tune
1.
The adjustable frequency drive enters into alarm
mode. A description of the alarm can be found in
the
Warnings and Alarms
chapter.
2.
"Report Value" in the [Alarm Log] shows the last
measuring sequence carried out by the Auto
Tune before the adjustable frequency drive
entered alarm mode. This number along with the
description of the alarm will assist you in trouble-
shooting. If you contact Danfoss for service, make
sure to mention the number and alarm
description.
NOTE!
Unsuccessful auto-tune is often caused by incorrectly
entering motor nameplate data or a too big difference
between the motor power size and the adjustable
frequency drive power size.
Step 4. Set speed limit and accel/decel times.
3-02 Minimum Reference
3-03 Maximum Reference
Table 4.11 Set up the desired limits for speed and ramp time.
4-11 Motor Speed Low Limit [RPM]
or
4-12 Motor Speed Low Limit
[Hz]
4-13 Motor Speed High Limit [RPM]
or
4-14 Motor Speed High Limit
[Hz]
3-41 Ramp 1 Ramp-up Time
3-42 Ramp 1 Ramp-down Time
4.5 Additional Connections
4.5.1 Parallel Connection of Motors
The adjustable frequency drive can control several parallel-
connected motors. The total current consumption of the
motors must not exceed the rated output current I
M,N
for
the adjustable frequency drive.
NOTE!
Installation with cables connected in a common joint, as in
the figure below, is only recommended for short cable
lengths.
NOTE!
When motors are connected in parallel,
1-29 Automatic
Motor Adaptation (AMA)
cannot be used.
NOTE!
The electronic thermal overload of the adjustable
frequency drive cannot be used as motor protection for
the individual motor in systems with parallel-connected
motors. Provide further motor protection with, for
example, thermistors in each motor or individual thermal
relays (circuit breakers are not suitable for protection).
How to Install
VLT AQUA 12-Pulse High Power Instruction Manual
MG.20.Y1.22 - VLT
®
is a registered Danfoss trademark
4-23
4
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