6.1.3. Potentiometer Reference
Voltage reference via a potentiometer.
Par. 3-15
Reference 1 Source
[1] =
Analog Input 53
Par. 6-10
Terminal 53, Low Voltage
= 0 Volt
Par. 6-11
Terminal 53, High Voltage
= 10 Volt
Par. 6-14
Terminal 53, Low Ref./
Feedb. Value
= 0 RPM
Par. 6-15
Terminal 53, High Ref./
Feedb. Value
= 1.500 RPM
Switch S201 = OFF (U)
6.1.4. Automatic Motor Adaptation (AMA)
AMA is an algorithm to measure the electrical motor parameters on a motor at standstill. This
means that AMA itself does not supply any torque.
AMA is useful when commissioning systems and optimising the adjustment of the frequency con-
verter to the applied motor. This feature is particularly used where the default setting does not
apply to the connected motor.
Par. 1-29 allows a choice of complete AMA with determination of all electrical motor parameters
or reduced AMA with determination of the stator resistance Rs only.
The duration of a total AMA varies from a few minutes on small motors to more than 15 minutes
on large motors.
Limitations and preconditions:
•
For the AMA to determine the motor parameters optimally, enter the correct motor
nameplate data in par. 1-20 to 1-26.
•
For the best adjustment of the frequency converter, carry out AMA on a cold motor.
Repeated AMA runs may lead to a heating of the motor, which results in an increase of
the stator resistance, Rs. Normally, this is not critical.
•
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 on up to one oversize
motor.
•
It is possible to carry out a reduced AMA test with an LC filter installed. Avoid carrying
out a complete AMA with an LC filter. If an overall setting is required, remove the LC
filter while running a total AMA. After completion of the AMA, reinsert the LC filter.
•
If motors are coupled in parallel, use only reduced AMA if any.
•
Avoid running a complete AMA when using synchronous motors. If synchronous motors
are applied, run a reduced AMA and manually set the extended motor data. The AMA
function does not apply to permanent magnet motors.
•
The frequency converter does not produce motor torque during an AMA. During an AMA,
it is imperative that the application does not force the motor shaft to run, which is known
to happen with e.g. wind milling in ventilation systems. This disturbs the AMA function.
6. Application Examples
VLT
®
HVAC Drive Design Guide
112
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
6
