Danfoss VLT AQUA Drive FC 202 Programming Manual page 167

Parameter Description
20-22 Setpoint 2
Range:
0 [-999999.999 -
ProcessCtrlUnit 999999.999
*
ProcessCtrlUnit]
20-23 Setpoint 3
Range:
0 [-999999.999 -
ProcessCtrlUnit 999999.999
*
ProcessCtrlUnit]
20-60 Sensorless Unit
Option:
[20] l/s
[23] m³/s
[24] m³/min
[25] m³/h
[71] bar
[73] kPa
[74] m WG
[75] mm Hg
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
MG20OB02
Programming Guide
Function:
Setpoint 2 is used in closed-
loop mode to enter a
setpoint reference for the PID
controller. See the description
of parameter 20-20 Feedback
Function.
NOTICE
The setpoint reference
entered here is added to
any other references that
are enabled (see
parameter group 3-1*
References).
Function:
Setpoint 3 is used in closed-
loop mode to enter a setpoint
reference for the PID
controller. See the description
of parameter 20-20 Feedback
Function.
NOTICE
If the minimum and
maximum references are
altered, a new PID auto-
tuning may be needed.
NOTICE
The setpoint reference
entered here is added to
any other references that
are enabled (see
parameter group 3-1*
References).
Function:
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20-60 Sensorless Unit
Option:
[124] CFM
[125] ft³/s
[126] ft³/min
[170] psi
[171] lb/in²
[172] in WG
[173] ft WG
[174] in Hg
20-69 Sensorless Information
Array [8]
Range:
0 [0 - 25 ]
*
3.17.3 20-7* Auto-tuning
PID Auto-tuning
The frequency converter closed-loop controller (parameter
group 20-** FC Closed Loop) can be auto-tuned, simplifying
and saving time during commissioning, while ensuring
accurate control adjustment. To use auto-tuning, configure
the frequency converter for closed loop in
parameter 1-00 Configuration Mode.
Use a graphical local control panel (GLCP) to react to
messages during the auto-tuning sequence.
Selecting either PID or SPC in parameter 20-79 Autotuning
puts the frequency converter into auto-tuning mode. The
LCP then shows on-screen instructions.
To start the fan/pump, press [Auto On] and apply a start
signal. The default control settings ensure that the setpoint
it eventually reached. For PID auto-tuning, it is possible to
adjust the speed manually by pressing [
where the feedback is around the system setpoint.
CAUTION
If the feedback goes outside the specified limits (2073
and 2074) defined during auto-tune set-up, the auto-
tuning is discarded. The limits also serve as application
protection during auto-tuning execution.
NOTICE
It is not possible to run the motor at maximum or
minimum speed when manually adjusting the motor
speed due to the need of increasing the motor speed
during auto-tuning.
Auto-tuning introduces step changes while operating at a
steady state and then monitors the feedback. For PID
control, the auto-tuning feedback response defines the
required values for parameter 20-93 PID Proportional Gain
and parameter 20-94 PID Integral Time are calculated.
Function:
Function:
▲ ▼
] or [ ] to a level
165
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