Smart Logic Control Programming; Slc Application Example - Danfoss FC 300 Design Manual

FC 300 Design Guide
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7.1.9. Smart Logic Control Programming

A new useful facility in the FC 300 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 react based on an event sent to or generated in the FC 300. The adjustable
frequency drive will then perform the pre-programmed action.

7.1.10. SLC Application Example

One sequence 1:
Start – ramp-up – run at reference speed 2 sec – ramp-down and hold shaft until stop.
Set the ramping times in par. 3-41 and 3-42 to the desired times.
t
ramp
An AMA can only be carried out if the rated motor current is a minimum of 35% of the
rated output current of the adjustable frequency drive. An AMA can be carried out on up
to one oversized 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.
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t n par
×
acc norm
=
ref RPM
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MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
7. Application Examples
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