NFO
Drives
AB
2021
201013
‐
2
Operating
and
Installation
Manual
25
When the motor data is entered and saved, run the
Tuning
command. In the user interface, this command is
located immediately succeeding the motor data section. Press [Enter] to go into the Tuning menu group, press [
]
(arrow up) to select Full Tuning option, and again press [Enter] to start the tuning procedure. After a completed
tuning, the motor parameters are recorded and saved in the inverter. Depending on the motor size, this procedure
should take about one minute. When tuning is ready, press [Escape] to exit the tuning command and return to the
main display.
The autotuning function sets
I-limit
to either 120 % of the motor's nominal current or the maximum of the inverter.
5.7.1 Full
tuning
To perform autotuning:
1. Check that motor is not running (press stop).
2. Go to parameter-group
Motor
and enter parameters
P-nom U-Nom, f-Nom, N-Nom, I-Nom
and
cos
.
3. Start the autotuning by selecting the
Tuning
command and pressing
.
4. When
asked
Full,
press
(any other button will not execute the command).
5. On successful tuning, the screen will show
Ready
.
6. Continue programming the other inverter parameters, if required.
If a fault occurs during autotuning, two different error messages may appear,
Tuning Fail M
or
Tuning Fail P
.
Tuning Fail M
indicates that measuring of the motor parameters failed, while
Tuning Fail P
indicates that one or
more parameter(s) is outside the allowable limit for the inverter. If the auto tuning process results in an error, the
cause of error must be identified and corrected before the motor can be started.
Faults may be due to:
Motor not connected correctly (short or open circuit in wiring).
Motor fault (short or open circuit).
Motor incorrectly connected (Y-connected instead of D-connected or vice versa).
The inverter is under or over dimensioned for the connected motor.
Note!
All tuning should be performed with a cold motor, i.e. the motor should have the normal ambient temperature
where it will be used. If tuned with warm motor, operating issues may occur when starting with a cold motor.
5.7.2 Basic
tuning
A simplified form of calculating parameters can be carried out by pressing
again in point 3 as above. The
display then reads
Basic
. This calculation procedure only measures the motor stator resistance and then uses that
as the basis for calculating the other motor parameters.
5.7.3 Calculated
tuning
If the stator resistance for the motor is known, the other parameters can be calculated. This can be done by
entering the known value of
R
-stat in point 2 above, and then pressing
three times in point 3. The display
will now show
Calc
, press
to run calculations.
This calculation method may not give exactly the same motor parameters as full (
Full Tuning
), but the same as
simplified (
Basic
) if the stator resistance is measured to the same value. With full autotuning, all motor parameters
are measured by the inverter, while during basic and calculated tuning remaining motor parameters are calculated
based on
R-stat
and the nominal motor data.
3006469-2022-04
