GE Ecomagination AF-600 FP Programming Manual page 163

Parameter Description
Before carrying out the PID auto tuning, set the following
parameters according to the load inertia:
•
Parameter F-07 Accel Time 1.
•
Parameter F-08 Decel Time 1.
or
3 3
•
Parameter E-10 Accel Time 2.
•
Parameter E-11 Decel Time 2.
If PID auto tuning is carried out with slow ramp times, the
auto-tuned parameters typically result in very slow control.
Before activating PID auto tuning, remove excessive
feedback sensor noise using the input filter (parameter
groups AN-##, E-6# and AO-##, terminal 53/54 filter time
constant/pulse filter time constant 29/33) before activating
PID auto tuning. To obtain the most accurate controller
parameters, carry out PID auto tuning when the
application runs in typical operation, that is with a typical
load.
CL-70 Closed Loop Type
Option:
[0] Auto
*
[1] Fast Pressure
[2] Slow Pressure
[3] Fast
Temperature
[4] Slow
Temperature
CL-71 PID Performance
Option:
[0] Normal Normal setting of this parameter is suitable for
*
[1] Fast
CL-72 PID Output Change
Range:
0.10 [0.01
*
- 0.50]
162
Function:
Select the application response speed if it
is known. The default setting is sufficient
for most applications. A more precise
value decreases the time needed for
carrying out PID adaptation. The setting
has no impact on values of parameters
and only affects the auto tuning speed.
Takes 30–60 s to complete.
Takes 10–20 s to complete.
Takes 30–60 s to complete.
Takes 10–20 minutes to complete.
Takes 30–60 minutes to complete.
Function:
pressure control in fan systems.
Fast setting is used in pumping systems, where a
faster control response is wanted.
Function:
This parameter sets the magnitude of step
change during auto tuning. The value is a
percentage of full speed. That is, if maximum
output frequency in parameter F-17 Motor Speed
High Limit [RPM]/parameter F-15 Motor Speed High
Limit [Hz] is set to 50 Hz, 0.10 is 10% of 50 Hz,
which is 5 Hz. Set this parameter to a value
resulting in feedback changes of 10–20% for best
tuning accuracy.
CL-73 Minimum Feedback Level
Range:
-999999
ProcessCtrlUnit
CL-74 Maximum Feedback Level
Range:
999999
ProcessCtrlUnit
CL-79 PID Autotuning
Option:
[0] Disabled
*
[1] Enabled
3.22.5 CL-8# PID Basic Settings
This parameter group is used to configure the basic
operation of the PID controller, including how it responds
to feedback that is above or below the setpoint, the speed
at which it first starts functioning, and when it indicates
that the system has reached the setpoint.
CL-81 PID Normal/ Inverse Control
Option:
[0] Normal The frequency converter's output frequency
*
[1] Inverse The frequency converter's output frequency
03/2016 All rights reserved.
Function:
[-999999.999 - Enter the minimum allowable
par. CL-74 feedback level in user units as
*
ProcessCtrlUnit] defined in
parameter CL-12 Reference/
Feedback Unit. If the level
drops below
parameter CL-73 Minimum
Feedback Level, auto tuning is
aborted and an error message
appears in the keypad.
Function:
[par. CL-73 - Enter the maximum allowable
999999.999 feedback level in user units as
*
ProcessCtrlUnit] defined in
parameter CL-12 Reference/
Feedback Unit. If the level
rises above
parameter CL-74 Maximum
Feedback Level, auto tuning is
aborted and an error message
appears in the keypad.
Function:
This parameter starts the PID 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.
Function:
decreases when the feedback is greater than the
setpoint reference. This behaviour is common for
pressure-controlled supply fan and pump
applications.
increases when the feedback is greater than the
DET-620D