—————— TPD32-EV ——————
126
5.3.6 Manual tuning of the regulators
The tuning of the TPD32-EV converters is factory set to a typical value for the motor size concerned. This nor
-
mally ensures satisfactory regulator results. If this setting, however, meets the requirements of the application
concerned, the regulator need not be optimized.
The converter contains the following close-loop control circuits:
- Regulator of the armature current. The auto tuning has to be perform via the
R&L Search
parameter.
- Speed regulator
- Field current regulator
- Armature voltage regulator
Following is a description of the system suitable to obtain the optimization, if necessary. In order to have a step
function, the internal “Test generator” is used (“SPEC FUNCTIONS” menu). The aim is to obtain a very good
step response.
The analog output can be brought back to the terminal strip, with a sampling time of 2 ms.
Using the Test generator
This function generates and makes available some signals with a square wave, with a frequency and a width that
can be set and which can be added to an offset that can be set too. With the parameter
Gen access
it is possible
to state on which regulator input the signal must be active. Further information can be found in section 6.15.1,
“Test generator”.
Manual tuning of speed regulator
- No voltage on terminal 12 (Drive disabled)
- Choose the following settings for the Test generator :
-
Gen access
=
Ramp ref
-
Gen frequency
=
0.2 Hz
-
Gen amplitude
=
10 %
-
Gen offset
=
10 %
- Measuring the reaction on an analog output. To this purpose
“Actual Spd”
and
“Motor current”
variables
must be set on two different analog outputs (see “Programming inputs/outputs”).
- In the START UP menu set the
Acc delta speed
parameter with the highest value and the
Acc delta time
parameter at 1 second.
- Set at 0.00 the
Speed P
and
Speed I
parameters in the REG PARAMETERS / ...menu.
- Enable the drive (voltage on terminal 12) and Start (voltage on terminal 13).
- Increase the
Speed P
till when the overshoot is lower by 4% when the reaction time is shorter.
- Increase
Speed I
until the overshoot is higher by 4%. Decrease it, so that it is slightly lower than 4%.
- Stop and disable the drive (remove the voltage on terminal 12 and 13).
-
Gen access
= Not connected
- Save the settings (SAVE PARAMETERS command in the SPECIAL FUNCTION menu).
n
ote
!
With the feedback “Bypass” function enabled (
Enable fbk bypas
= Enabled) the converter
switch directly to the armature feedback (CEMF) when the speed feedback is no more present.
This is possible when the converter is working at constant field. In this case with a discon
-
nected reaction signal, it is necessary to carry out again the above mentioned optimization
of the speed regulator. The P section of the speed regulator is set via the
Speed P bypass
parameter and the I section with the
Speed I bypass
parameter.
Содержание TPD32-EV-...-2B
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