Potentiometer Reference; Automatic Motor Adaptation (Ama) - Danfoss VLT AQUA Drive Design Manual

6. Application Examples

6.1.3. Potentiometer Reference

Voltage reference via a potentiometer.
par. 3-15 Reference
par. 6-10 Terminal
par. 6-11 Terminal
par. 6-14 Terminal
par. 6-15 Terminal
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 optimising the adjustment of the frequency converter to the applied motor. This feature is particularly
used where the default setting does not apply to the connected motor.
Motor Adaptation (AMA)
par. 1-29 Automatic
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 Motor
Rotation Check
1-28 Motor
• 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 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 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.
The Smart Logic Control (SLC) is essentially a sequence of user defined actions (see par. ) executed by the SLC when the associated user defined
event (see par. ) is evaluated as TRUE by the SLC.
Events and actions 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.
event
Only one will be evaluated at any time. If an
events
other will be evaluated. This means that when the SLC starts, it evaluates
[1]
is evaluated TRUE, the SLC executes
134
1 Source [1] = Analog Input 53
53 Low Voltage
= 0 Volt
53 High Voltage
= 10 Volt
53 Low Ref./Feedb. Value
= 0 RPM
53 High Ref./Feedb. Value = 1.500 RPM
allows a choice of complete AMA with determination of all electrical motor parameters or reduced AMA with
.
event [2]
will be evaluated and if evaluated TRUE,
event
is evaluated as FALSE, nothing happens (in the SLC) during the present scan interval and no
action [1]
and starts evaluating
MG.20.N4.02 - VLT
event [1] is fulfilled (attains the value TRUE),
action [2]
will be executed and so on. Events and actions
event [1] event [1]
(and only
event [2]
.
®
is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
Power [kW]
to par.
action
event
) each scan interval. Only when