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Description of choice:
Select a value that corresponds to the nameplate
data on the motor.
NOTE
The max. value equals f
in parameter 104 Motor frequency, f
107 Automatic motor tuning, AMT
(AUTO MOTOR TUN.)
Value:
Optimization off (AMT OFF)
Optimisation on (AMT START)
Function:
Automatic motor tuning is an algorithm that measures
stator resistance R
without the motor axle turning.
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This means that the motor is not delivering any torque.
AMT can be used with benefit when initializing units
where the user wishes to optimize adjustment of the
variable frequency drive to the motor being used.
This is used in particular when the factory setting
does not sufficiently cover the motor.
For the best possible tuning of the variable frequency
drive it is recommended that AMT is performed
on a cold motor. It should be noted that repeated
AMT runs can cause heating of the motor, resulting
in an increase in the stator resistance R
rule, however, this is not critical.
AMT is performed as follows:
Start AMT:
1. Give a STOP signal.
2. Parameter 107 Automatic motor tuning is set
at value [2] Optimization on.
3. A START signal is given and parameter 107
Automatic motor tuning is reset to [0] when
AMT has been completed.
In factory setting START requires terminals 18 and
27 to be connected to terminal 12.
Complete AMT:
AMT is completed by giving a RESET signal.
Parameter 108 Stator resistance, Rs is updated
with the optimized value.
Interrupting AMT:
= factory setting. () = display text [] = value for use in communication via serial communication port
110
x 60. f
to be set
M,N
M,N
.
M,N
[0]
[2]
. As a
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Decentral Solutions
AMT can be interrupted during the optimization
procedure by giving a STOP signal.
When using the AMT function the following
points should be observed:
- For AMT to be able to define the motor parameters
as well as possible, the correct type plate data for
the motor connected to the variable frequency drive
must be keyed into parameters 102 to 106.
- Alarms will appear in the display if faults arise
during tuning of the motor.
- As a rule the AMT function will be able to
measure the R
values for motors that are
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1-2 times larger or smaller than the variable
frequency drive's nominal size.
- If you wish to interrupt automatic motor tuning,
press the [STOP/RESET] key.
NOTE
AMT may not be performed on motors
connected in parallel, nor may setup changes
be made while AMT is running.
Description of choice:
Select Optimization on [2] if you want the frequency
converter to perform automatic motor tuning.
108 Stator resistance R
(STATOR RESISTAN)
Value:
0.000 - X.XXX
Function:
After setting of parameters 102-106 Nameplate data,
a number of adjustments of various parameters is
carried out automatically, including stator resistance
R
. A manually entered R
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motor. The shaft performance can be improved by
fine-tuning R
and X
, see procedure below.
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NOTE
Parameters 108 Stator resistance R
Stator reactance X
changed if nameplate data has been set.
Description of choice:
R
can be set as follows:
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MG.90.F2.22 - VLT is a registered Danfoss trademark
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Depends on choice of motor
must apply to a cold
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and 109
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are normally not to be
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