20-22 Setpoint 2
Range:
Function:
0
ProcessCtrlUnit
*
[-999999.999 -
999999.999
ProcessCtrlUnit]
Setpoint 2 is used in closed-
loop mode to enter a
setpoint reference for the PID
controller. See the description
of
.
NOTICE
The setpoint reference
entered here is added to
any other references that
are enabled (see
parameter group 3-1*
References
).
20-23 Setpoint 3
Range:
Function:
0
ProcessCtrlUnit
*
[-999999.999 -
999999.999
ProcessCtrlUnit]
Setpoint 3 is used in closed-
loop mode to enter a setpoint
reference for the PID
controller. See the description
of
.
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
).
20-60 Sensorless Unit
Option:
Function:
[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
20-60 Sensorless Unit
Option:
Function:
[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:
Function:
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
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 [
▲
] or [
▼
] to a level
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.
Parameter Description
Programming Guide
MG20OB02
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Summary of Contents for VLT AQUA Drive FC 202
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