Potentiometer Reference; Automatic Motor Adaptation (Ama); Smart Logic Control - Danfoss VLT FC 102 Series Design Manual

Application Examples

7.1.3 Potentiometer Reference

Voltage reference via a potentiometer.
3-15 Reference 1 Source [1] = Analog Input 53
6-10 Terminal 53 Low Voltage = 0 V
6-11 Terminal 53 High Voltage = 10 V
6-14 Terminal 53 Low Ref./Feedb. Value = 0 RPM
6-15 Terminal 53 High Ref./Feedb. Value =
1500 RPM
Switch S201 = OFF (U)
7 7
Figure 7.3 Voltage Reference via a Potentiometer

7.1.4 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
optimizing the adjustment of the adjustable frequency
drive to the applied motor. This feature is particularly used
where the default setting does not apply to the connected
motor.
1-29 Automatic Motor Adaptation (AMA) 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.
136
Design Guide
Limitations and preconditions:

7.1.5 Smart Logic Control

A useful facility in the adjustable frequency drive is the
Smart Logic Control (SLC).
In applications where a PLC generates a simple sequence,
the SLC may take over elementary tasks from the main
control.
SLC is designed to act from event send to or generated in
the adjustable frequency drive. The adjustable frequency
drive then performs the pre-programmed action.
Danfoss A/S © Rev. 06/2014 All rights reserved.
•
For the AMA to determine the motor parameters
optimally, enter the correct motor nameplate
data in 1-20 Motor Power [kW] to 1-28 Motor
Rotation Check.
•
For the best adjustment of the adjustable
frequency drive, carry out an 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 a
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 windmilling in ventilation systems,
for example. This disturbs the AMA function.
•
AMA cannot be activated when running a PM
motor (when 1-10 Motor Construction is set to [1]
PM non-salient SPM).
MG11BC22