VLT
®
4000 VT
Set the motor current I
VLT,N
, taking into account
the star Y or delta
connected motor.
Description of choice:
Set a value that equals the nameplate data on the motor.
NOTE
It is important to enter the correct value, since
this forms part of the V V C
PLUS
control feature.
106 Rated motor speed, n
M,N
(MOTOR NOM. SPEED)
Value:
100 - f
M,N
x 60 (max. 60000 rpm)
✭
Depends on parameter 102
Motor power, P
M,N
.
Function:
This sets the value that corresponds to the rated
motor speed n
M,N
, from the nameplate data.
Description of choice:
Choose a value that corresponds to the
motor nameplate data.
NOTE
It is important to set the correct value, since
this forms part of the V V C
PLUS
control feature.
The max. value equals f
M,N
x 60. f
M,N
is set
in parameter 104
Motor frequency, f
M,N
.
107 Automatic motor adaptation, AMA
(AUTO MOTOR ADAPT)
Value:
✭
Optimisation disable (NO AMA)
[0]
Automatic adaptation (RUN AMA)
[1]
Automatic adaptation with LC-filter
(RUN AMA WITH LC-FILT)
[2]
Function:
Automatic motor adaptation is a test algorithm
that measures the electrical motor parameters
at motor standstill. This means that AMA itself
does not supply any torque.
AMA is useful when commissioning systems, where the
user wants to optimise the adjustment of the VLT AFD to
the motor applied. This feature is used where the factory
setting does not match requirements of the motor.
For the best adjustment of the VLT AFD, it is
recommended to carry out AMA on a cold motor.
It must be noted that repeated AMA runs may
lead to a heating of the motor that will result in
an increase of the stator resistance R
S
. However,
this is not normally critical.
It is possible via parameter 107
Automatic motor
adaptation
, AMA to choose whether a complete
automatic motor adaptation
Automatic adaptation
[1] is to be carried out, or whether reduced
automatic motor adaptation
Automatic adaptation
with LC-filter
[2] is to be made.
It is only possible to carry out the reduced test if a
LC-filter has been placed between the VLT AFD and
the motor. If a total setting is required, the LC-filter can
be removed and, after completion of the AMA, it can
be reinstalled. In
Automatic optimisation with LC-filter
[2] there is no test of motor symmetry and of whether
all motor phases have been connected. The following
must be noted when the AMA function is used:
-
For AMA to be able to determine the motor
parameters optimally, the correct nameplate data
for the motor connected to the VLT AFD must
be entered in parameters 102 to 106.
-
The duration of a total automatic motor adaptation
varies from a few minutes to approx. 10 minutes
for small motors, depending on the rating of
the motor used (the time for a 7.5 HP motor,
for example, is approx. 4 minutes).
-
Alarms and warnings will be shown in the display
if faults occur during motor adaptation.
-
AMA can only be carried out if the rated motor
current of the motor is min. 35% of the rated
out-put current of the VLT AFD.
-
If automatic motor adaptation is to be discontinued,
press the [OFF/STOP] key.
NOTE
AMA is not allowed on motors connected
in parallel.
Description of choice:
Select
Automatic adaptation
[1] if the VLT AFD is to carry
out a complete automatic motor adaptation. Select
Automatic adaptation with LC-filter
[2] if a LC-filter has
been placed between the VLT AFD and the motor.
MG.40.A7.22 - VLT is a registered Danfoss trademark
70
