VLT
®
2800 Series
NB!:
The max. value equals f
M,N
x 60. f
M,N
to be
set in parameter 104 Motor frequency, f
M,N
.
107 Automatic motor tuning, AMT
(AUTO MOTOR TUN.)
Value:
✭Optimisation off (AMT OFF)
[0]
Optimisation on (AMT START)
[2]
Function:
NB!:
AMT is not possible on VLT 2880-82.
Automatic motor tuning is an algorithm that measures
stator resis tance R
S
without the motor axle turning.
This means that the motor is not delivering any torque.
AMT can be used with benefit when init ia lising u nits
where the user w ishes to optimise adjustment of
the frequency converter to the motor be ing used.
This is used in particular whe n the factory setting
does not sufficiently cover the motor.
For the best possible tuning of the frequency co nverter
it is recommended that AM T 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
S
.Asa
rule, however, this is not critical.
AMT is p e rformed as follows:
S
tart AMT:
1. Give a S TOP signal.
2. Parame ter 107 Automatic motor tuning is set
at value [2] Optimisation on.
3. A START signal is given and parameter 107
Automatic motor tuning is reset to [0] when
AMT ha s been completed.
C
omple te AMT:
AMT is completed by giving a RESET signal.
Parameter 108 Stator resistance, Rs is updated
with the optimised value.
I
nterrupting AMT:
AMT can be interrupted during the optimisation
procedure by giving a STOP signal.
When using the AM T 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 frequency c onverter
must be keyed into parameters 102 to 106.
- Alarms will appear in the display if faults arise
during tuning of the motor.
- A s a rule the AMT func tion will be able to measure
the R
S
values for motors that are 1-2 times larger or
smaller than the frequency converter’snominalsize.
- If you wish to interrupt automatic motor tuning,
press the [STOP/RESET] key.
NB!:
AMT may not be performed on motors
connected in parallel, nor may setup changes
be made while AMT is running.
T
he proc edure for AMT controlled from the SLCP:
See section entitled Control unit.
Description of choice:
Select Optimisation on [2] if you want the frequency
converter to perform automatic motor tuning.
108 Stator resistance R
S
(STATOR RESISTAN)
Value:
0.000 - X.XXX
✭ Depends on choice of m otor
Function:
After setting of parameters 102-106 Nameplate data,
a number of adjustme nts of various parameters is
carried out automatically, including stator resistance
R
S
. A manually entered R
S
must apply to a cold
motor. The shaft performance can be improved by
fine-tuning R
S
and X
S
, see procedure below.
NB!:
Parameters 108 Stator resistance R
S
and 109
Stator reactance X
S
are normally not to be
changed if nameplate data has been set.
Description of choice:
R
S
can be set as follows:
1. Use the factory settings of R
S
which the
frequency converter itself chooses on the basis
of the motor nameplate data.
2. The value is stated by the motor supplier.
3. The value is obtained through manual
measurements: R
S
can be calculated by measuring
theresistanceR
PHASE-PHASE
between two phase
terminals. Where R
PHASE-PHASE
is lower than 1-2
Ohms ( typical for motors > 5.5 kW, 400 V) , a special
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.E9.02 - VLT is a registered Danfoss trademark
70
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