Danfoss VLT 6000 HVAC Series

105
Motor current, I
M,N
(MOTOR CURRENT)
(MOTOR CURRENT)
Value:
0.01 - I
VLT,MAX
A
Depends on the unit
Function:
The rated motor current I
M,N
forms part of the frequen-
cy converter calculations i.a. of torque and motor ther-
mal protection. 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 mo-
tor.
NB!
It is important to enter the correct value,
since this forms part of the VVC
+
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 is where the value is set that corresponds to the
rated motor speed n
M,N
, which can be seen from the
nameplate data.
Description of choice:
Choose a value that corresponds to the motor name-
plate data.
NB!
It is important to set the correct value,
since this forms part of the VVC
+
control
feature. The max. value equals f
M,N
x 60.
f
M,N
is set in parameter 104 Motor frequen-
cy, 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 [2]
(RUN AMA WITH LC-FILT)
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 fre-
quency converter to the motor applied. This feature is
used in particular where the factory setting does not
adequately cover the motor in question.
For the best adjustment of the frequency converter, 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.
NB!
It is important to run AMA with any motors
•55 kW/ 75 HP
It is possible via parameter 107 Automatic motor adap-
tation, AMA to choose whether a complete automatic
motor adaptation Automatic adaptation [1] is to be car-
ried out, or whether reduced automatic motor adapta-
tion 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 frequency convert-
er 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 frequency
converter must be entered in parameters 102
to 106.
-
The duration of a total automatic motor adap-
tation 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 kW
motor, for example, is approx. 4 minutes).
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
110 MG.61.B5.02 - VLT
®
is a registered Danfoss trademark