Danfoss VLT AQUA Drive FC 202 Programming Manual page 169

Parameter Description
20-79 Autotuning
Option: Function:
This parameter starts the auto-tuning sequence.
Once the auto-tuning has successfully
completed and the settings have been
accepted or rejected by pressing [OK] or
[Cancel] at the end of tuning, this parameter is
reset to [0] Disabled.
[0] Disabled
*
[1] PID Enables PID auto-tuning.
[2] Smart Enables smart process control auto-tuning. That
Process automatically selects the best suitable controller
principle (PID or DRC).
[3] DRC This option is activated by SPC auto-tuning. Not
typically used as a manual option.
3.17.4 20-8* PID Basic Settings
This parameter group is used to configure the basic
operation of the PID controller, including:
•
Response to feedback above or below the
setpoint.
•
The speed at which it first starts functioning.
•
When it indicates that the system has reached
the setpoint.
20-81 PID Normal/ Inverse Control
Option: Function:
[0] Normal The frequency converter's output frequency
*
decreases when the feedback is greater than the
setpoint reference. This behavior is common for
pressure-controlled supply fan and pump
applications.
[1] Inverse The frequency converter's output frequency
increases when the feedback is greater than the
setpoint reference.
20-82 PID Start Speed [RPM]
Range: Function:
NOTICE
Size [ 0 -
related par.
*
This parameter is only visible if
4-13
parameter 0-02 Motor Speed Unit is set
RPM]
to [0] RPM.
When the frequency converter is first started,
it initially ramps up to this output speed in
open-loop mode, following the active ramp-
up time. When the output speed
programmed is reached, the frequency
converter automatically switches to closed-
loop mode and the PID controller begins to
function. This is useful in applications that
MG20OB02
Programming Guide
20-82 PID Start Speed [RPM]
Range:
20-83 PID Start Speed [Hz]
Range:
Size
related
*
20-84 On Reference Bandwidth
Range:
5 %
*
200 %]
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Function:
require quick acceleration to a minimum
speed at start-up.
Function:
NOTICE
[ 0 -
par.
This parameter is only visible if
4-14
parameter 0-02 Motor Speed Unit is set
Hz]
to [1] Hz.
When the frequency converter is first started,
it initially ramps up to this output frequency
in open-loop mode, following the active
ramp-up time. When the output frequency
programmed is reached, the frequency
converter automatically switches to closed-
loop mode and the PID controller begins to
function. This is useful in applications that
require quick acceleration to a minimum
speed at start-up.
Function:
[0 - When the difference between the feedback and
the setpoint reference is less than the value of
this parameter, the frequency converter's display
shows Run on Reference. This status can be
communicated externally by programming the
function of a digital output for [8] Run on
Reference/No Warning. Also, for serial communi-
cations, the On Reference status bit of the
frequency converter status word is high (value =
1).
The On Reference Bandwidth is calculated as a
percentage of the setpoint reference.
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