Danfoss VLT 5000 FLUX, Руководство по эксплуатации, Страница: 57 / 158

VLT
®
5000 FLUX
Reference
Handling
NB!:
If a short circuit in the brake transistor
occurs, power dissipation in the brake resistor
can only be prevented by using a mains
switch or contactor to disconnect the mains for
the frequency converter. (The contactor can be
controlled by the frequency converter).
■
Automatic Motor Adaptation, AMA
Automatic motor adaptation is a test algorithm
that measures the electrical motor parameters at
a 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
frequency converter to the motor applied. This feature
is used in particular where the factory setting does
not adequately cover the motor in question.
There are five motor parameters (150-154) that are of
primary significance in automatic motor adaptation:
the stator resistance, R
s
, rotor resistance, R
r
, stator
leakage reactance, X
1
, rotor leakage reactance, X
2
,
main reactance X
h
. Parameter 107 allows a choice
of automatic motor adaptation, with determination
of R
s
, X
h
, X
1
, X
2
, R
r
or reduced automatic motor
adaptation with determination of only R
s
.
The duration of a total automatic motor adaptation
varies from a few minutes on small motors to more
than 10 minutes on large motors.
Limitations and preconditions:
• For AMA to be able to determine the motor
parameters optimally, the correct nameplate data
for the motor connected to the frequency converter
must be entered in parameters 102 to 106.
• For the best adjustment of the frequency converter,
it is recommended to carry out AMA on a cold
motor. Repeated AMA runs may lead to a
heating of the motor that will result in an increase
of the resistance, R
s
and R
r
.
• AMA can only be carried out if the rated motor
current is minimum 35% of the rated output
current of the frequency converter. AMA can be
carried out up to one oversize motor.
• If a LC filter is inserted between the frequency
converter and the motor, a reduced test is preferred.
If an overall setting is required, remove the LC
filter while running a total AMA. After completion
of the AMA reinsert the LC filter.
• Long motor cables can have an effect on the
result of the AMA function.
How to perform an AMA
1. Press the [STOP/RESET] key
2. Set motor nameplate data in parameters 102-106
3. Select whether a total [ENABLE COMPLETE
AMA] or an [ENABLE REDUCED AMA] is
required in parameter 107
4. Connect terminal 12 (24 VDC) to terminal
37 on the control card
5. Connect terminal 12 (24 VDC) to terminal
27 on the control card
6. Connect terminal 12 (24 VDC) to terminal
18 on the control card
7. Press the [START] key to start the automatic
motor adaptation.
Now the automatic motor adaptation goes through
four tests (for reduced AMA only the first two tests).
The process of the test can be followed in the display
as dots after the text WORKING in parameter 107.
NB!:
AMA can only be carried out successfully if
there are no alarms during tuning.
Discontinue AMA
If the automatic motor adaptation is to be discontinued,
press the [STOP/RESET] key or disconnect
terminal 18 from terminal 12.
The automatic motor adaptation ends up with one
of the following messages after the test:
[AMA FINISHED OK]
The AMA was carried out successfully (parameter 107).
or
Warnings and alarm messages
ALARM 22
Auto-optimisation not OK
[AUTO MOTOR ADAPT FAIL]
A fault has been found during automatic motor
adaptation. Press the [STOP/RESET] key or disconnect
terminal 18 from terminal 12. Check the possible cause
to the fault related to the alarm message given. The
MG.55.A6.02 - VLT is a registered Danfoss trademark
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