6.1.3 Potentiometer Reference
Voltage reference via a potentiometer.
3-15 Reference 1 Source
[1] =
Analog Input 53
6-10 Terminal 53 Low Voltage
= 0V
6-11 Terminal 53 High Voltage
= 10V
6-14 Terminal 53 Low Ref./Feedb. Value
= 0 RPM
6-15 Terminal 53 High Ref./Feedb. Value
= 1500
RPM
Switch S201 = OFF (U)
Figure 6.3
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
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.
Limitations and preconditions:
•
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 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).
6.1.5 Smart Logic Control
A useful facility in the VLT
®
HVAC Drive Adjustable
frequency drive is the Smart Logic Control (SLC).
In applications where a PLC is generating 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 will then perform the pre-programmed action.
6.1.6 Smart Logic Control Programming
The Smart Logic Control (SLC) is essentially a sequence of
user defined actions (see
13-52 SL Controller Action
)
executed by the SLC when the associated user defined
Application Examples
VLT
®
HVAC Drive Design Guide
6-2
MG11BB22 - VLT
®
is a registered Danfoss trademark
6
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