Special Features; Autotuning - Santerno DCREG2 Series User Manual

DCREG2
DCREG4
6

SPECIAL FEATURES

6.1

AUTOTUNING

The drives of the DCREG2 and DCREG4 series are provided with a particular operating mode, which is
able to recognize the essential characteristics of the motor and load as well, in order to automatically
calculate the optimal parameters to be inserted into the current and speed loops.
The different parameters containing the above mentioned characteristics do already have default values
written in the EEPROM, which normally grant a generally satisfactory operation for the most common
applications of the drive. To better streamline the performances, the AUTOMATIC TUNING procedure
can be performed. This display-assisted procedure is performed off-line at the first set-up of the machine
and whenever necessary (i.e., if the electromechanical characteristics of the machine have changed).
For instance, the following sections refer to the digital commands entered through the terminal board.
The three kinds of automatic tuning are listed below.
Before operating one of the three, the ENABLE contact at terminal 24 and the START contact at
terminal 26 must both be open.
1. Current self-tuning. Can be performed only choosing a predictive control for the current loop by
means of the parameter C051 (CurrLoopSel) programmed with value 1:Predictive=>J1. Before doing
this, set jumper J1 from position 1 to position 0. Jumper J1 is located on board ES729/1 (installed inside
the equipment on ES728/2 control board).
On the other hand, this self-tuning is not available if for the current loop you choose a proportional-integral
control by means of parameter C051 (CurrLoopSel) programmed at the value 0:P1 operating. This
selection is however recommended in case of a DCREG4 in armature feedback or in case of a DCREG2
and generally in all cases where the resistance torque is much higher than the inertia one, or when the
output bars of the DCREG do not supply a motor but supply a resistive load.
The command is issued by setting parameter P001 to 1:Current through the "DEC" or "INC" keys and by
pressing the "SAVE" key. When the following message Close ENABLE to continue is displayed, close the
ENABLE contact at term. 24 by closing (if not already done) the KM remote switch that supplies the power
section. When the Press SAVE to continue message is displayed, press the "SAVE" key again. The
autotuning procedure is over when message AutoTune in progress... disappears and P001=0 is displayed
again.
The values of parameters P103, P104 are calculated and saved on EEPROM. Moreover, the value of
parameter concerning the armature feedback reading is optimised in such a way that while the drive is off,
parameter M006 (Varm) displays 0V.
N.B. During the self-tuning as above, the alarm A014 (R out of range) can trip if the motor rated current,
set by par. C000, is too low if compared to the drive rated current. Therefore, the drive may never be
overdimensioned if compared to the motor, but on the contrary its size must be comparable to or
immediately higher than the motor rated current.
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