VLT
®
6000 HVAC
84
★
= factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
MG.60.B1.02 - VLT is a registered Danfoss trade mark
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 frequency
converter 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 frequency
converter 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 kW 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
output current of the VLT frequency converter.
-
If automatic motor adaptation is to be
discontinued, press the [OFF/STOP] key.
NB!
AMA is not allowed on motors connected in
parallel.
Description of choice:
Select
Automatic adaptation
[1] if the VLT frequency
converter 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 frequency
converter and the motor.
Procedure for automatic motor adaptation:
1. Set the motor parameters in accordance with the
motor nameplate data given in parameters 102-
106
Nameplate data.
2. Connect 24 V DC (possibly from terminal 12) to
terminal 27 on the control card.
3. Select Automatic adaptation [1] or Automatic
adaptation with LC-filter [2] in parameter 107
Automatic motor adaptation, AMA.
4. Start up the VLT frequency converter or connect
terminal 18 (start) to 24 V DC (possibly from
terminal 12).
5.
After a normal sequence, the display reads:
AMA STOP. After a reset, the VLT frequency
converter will be ready to start operation again.
If the automatic motor adaptation is to be
stopped:
1. Press the [OFF/STOP] key.
If there is a fault, the display reads:
ALARM 22
1. Press the [Reset] key.
2. Check for possible causes of the fault in accor-
dance with the alarm message. See page 101.
If there is a warning, the display reads:
WARNING 39-42
1. Check for possible causes of the fault in
accordance with the warning. See page 101.
2. Press the [CHANGE DATA] key and select
"Continue" if AMA is to continue despite the
warning, or press the [OFF/STOP] key to stop the
automatic motor adaptation.
108 Start voltage of parallel motors
(MULTIM.START VOLT)
Value:
0.0 - parameter 103
Motor voltage, U
M,N
✭
depends on par. 103
Motor voltage, U
M,N
Function:
This parameter specifies the start-up voltage of the
permanent VT characteristics at 0 Hz for motors
connected in parallel.
The start-up voltage represents a supplementary
voltage input to the motor. By increasing the start-up
voltage, motors connected in parallel receive a higher
start-up torque. This is used especially for small
motors (< 4.0 kW) connected in parallel, as they have
a higher stator resistance than motors above 5.5 kW.
This function is only active if
Parallel motors
[1] has been
selected in parameter 101
Torque characteristics
.
Description of choice:
Set the start-up voltage at 0 Hz. The maximum
voltage depends on parameter 103
Motor voltage,
U
M,N
.
