Potentiometer Reference; Automatic Motor Adaptation (Ama) - Danfoss vlt aqua Design Manual

6 Application Examples

6.1.3 Potentiometer Reference

Voltage reference via a potentiometer.
Reference 1 Source
par. 3-15
Terminal 53 Low Voltage
par. 6-10
Terminal 53 High Voltage
par. 6-11
par. 6-14 Terminal 53 Low Ref./Feedb. Value
Terminal 53 High Ref./Feedb. Value
par. 6-15
Switch S201 = OFF (U)
6

6.1.4 Automatic Motor Adaptation (AMA)

AMA is an algorithm to measure the electrical motor parameters on a motor at standstill. This means thatAMA itself does not supply any torque.
AMA is useful when commissioning systems and optimizing the adjustment of the adjustable frequency drive to the applied motor. In particular, this
feature is used where the default setting does not apply to the connected motor.
Automatic Motor Adaptation (AMA)
par. 1-29
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
par. 1-28 Motor Rotation Check
• For the best adjustment of the adjustable frequency drive, 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 adjustable frequency drive. AMA can
be carried out on up to one oversize motor.
• It is possible to carry out a reduced AMA test with a sine-wave filter installed. Avoid carrying out a complete AMA with a sine-wave filter. If an
overall setting is required, remove the sine-wave filter while running a total AMA. After completion of the AMA, reinsert the sine-wave 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 adjustable frequency drive 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.
The Smart Logic Control (SLC) is essentially a sequence of user defined actions (see par. 13-52
associated user defined event
Events actions
and are each numbered and are linked in pairs called states. This means that when
[1]
is executed. After this, the conditions of
are placed in array parameters.
6-2
Analog Input 53
[1] =
= 0 Volt
= 10 Volt
= 0 RPM
= 1500 RPM
allows a choice of complete AMA with determination of all electrical motor parameters or reduced AMA with
.
(see par. 13-51 SL Controller Event ) is evaluated as TRUE by the SLC.
event [2]
will be evaluated and, if evaluated TRUE,
MG.20.N5.22 - VLT
SL Controller Action
event [1]
is fulfilled (attains the value TRUE),
action [2]
will be executed and so on. Events and actions
®
is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
Motor Power [kW] to
) executed by the SLC when the
action