Example of Process PID Control set-up
Function
Par. no.
Setting
Initialize the frequency converter
H-03
[2] Initialization - make a power cycling - press reset
1) Set motor parameters:
Set the motor parameters according to name plate data P-02 to
P-07
F-04 &
F-05
As stated on motor name plate
Perform a full auto tune
P-04
[1] Enable complete auto tune
2) Check that motor is running in the right direction.
When motor is connected to frequency converter with straight forward phase order as U - U; V- V; W - W motor shaft usually turns clockwise seen into shaft
end.
Press “Hand” Keypad key. Check shaft direction by apply-
ing a manual reference.
If motor turns opposite of required direction:
1. Change motor direction in par. H-08
Reverse Lock
2. Turn off mains - wait for DC link to discharge - switch
two of the motor phases
H-08
Select correct motor shaft direction
Set configuration mode
H-40
[3] Process
Set Local Mode Configuration
H-45
[0] Speed Open Loop
3) Set reference configuration, ie. the range for reference handling. Set scaling of analog input in par. AN-##
Set reference/feedback units
Set min. reference (10
°
C)
Set max. reference (80
°
C)
If set value is determined from a preset value (array pa-
rameter), set other reference sources to No Function
F-51
F-52
F-53
C-05
[60]
°
C Unit shown on display
-5
°
C
35
°
C
[0] 35%
Ref
=
Par
.
C
−
05(0)
100
× ((
Par
.
F
−
53)
−
(
par
.
F
−
52)) = 24, 5°
C
par. F-64
Preset Relative Reference
to par. F-68
Relative Scaling Reference Resource
[0] = No Function
4) Adjust limits for the frequency converter:
Set ramp times to an appropriate value as 20 sec.
F-07
F-08
20 sec.
20 sec.
Set min. speed limits
Set motor speed max. limit
Set max. output frequency
F-18
F-17
F-03
300 RPM
1500 RPM
60 Hz
Set S201 or S202 to wanted analog input function (Voltage (V) or milli-Amps (I))
NOTE! Switches are sensitive - Make a power cycling keeping default setting of V
5) Scale analog inputs used for reference and feedback
Set terminal 53 low voltage
Set terminal 53 high voltage
Set terminal 54 low feedback value
Set terminal 54 high feedback value
Set feedback source
AN-10
AN-11
AN-24
AN-25
PI-20
0 V
10 V
-5
°
C
35
°
C
[2] Analog input 54
6) Basic PID settings
Process PID Normal/Inverse
PI-30
[0] Normal
Process PID Anti Wind-up
PI-31
[1] On
Process PID start speed
PI-32
300 rpm
Save parameters to Keypad
K-50
[1] All to Keypad
Optimisation of the process regulator
The basic settings have now been made; all that needs to be done is to optimise the proportional gain, the integration time and the differentiation time
(par. PI-33
Process PID Proportional Gain
, par. PI-34
Process PID Integral Time
, par. PI-35
Process PID Differentiation Time
). In most processes, this can be done by
following the guidelines given below.
1.
Start the motor
2.
Set par. PI-33
Process PID Proportional Gain
to 0.3 and increase it until the feedback signal again begins to vary continuously. Then reduce the value
until the feedback signal has stabilised. Now lower the proportional gain by 40-60%.
3.
Set par. PI-34
Process PID Integral Time
to 20 sec. and reduce the value until the feedback signal again begins to vary continuously. Increase the integration
time until the feedback signal stabilises, followed by an increase of 15-50%.
4.
Only use par. PI-35
Process PID Differentiation Time
for very fast-acting systems only (differentiation time). The typical value is four times the set integration
time. The differentiator should only be used when the setting of the proportional gain and the integration time has been fully optimised. Make sure that
oscillations on the feedback signal is sufficiently dampened by the lowpass filter on the feedback signal.
NB!
If necessary, start/stop can be activated a number of times in order to provoke a variation of the feedback signal.
AF-650 GP Design Guide
33
3
Содержание AF-650 GP Series
Страница 5: ...AF 650 GP Design Guide 4 1...
Страница 53: ...AF 650 GP Design Guide 52 4...
Страница 97: ...Please note airflow directions 6 1 5 Mechanical Dimensions AF 650 GP Design Guide 96 6...
Страница 98: ...Please note airflow directions AF 650 GP Design Guide 97 6...
Страница 99: ...Please note airflow directions AF 650 GP Design Guide 98 6...
Страница 100: ...Please note airflow directions AF 650 GP Design Guide 99 6...
Страница 173: ...Max cable length 150 m AF 650 GP Design Guide 172 9...
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