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SINUS PENTA
PROGRAMMING GUIDE
256
/
486
Table 68: Programmable “Motor Tune” functions
Value of I074
Motor
rotation
Tuning
[0: Motor Params]
no
Motor parameter tuning through
automatic
estimation based on motor
measurements or ratings.
Tuning required for the correct operation of VTC, FOC and IFD control with slip
compensation.
The following parameters are computed (parameter names are given for motor M1
only):
-
Stator resistance
C022
, through automatic estimation
-
Leakage inductance
C023
, through automatic estimation
-
If
C021
=0, a first trial value for no-load current
C021
is computed based on
the motor ratings (rated power in particular), otherwise, the value in
C021
is not changed. An accurate value for
C021
is required when using VTC
and FOC control algorithms, so it is recommended that it is measured by
means of a special test as detailed in the FIRST STARTUP section
-
Mutual inductance
C024
, based on motor ratings and no-load current
-
If
C025
=0, a first trial value for rotor time constant
C025,
otherwise the
value in
C025
is not changed.
Although
a first trial value for the rotor time
constant is computed, the correct operation of the VTC and FOC control
algorithms requires that the rotor time constant is computed via the
procedure
I074
=[2: Control YES rot] or is manually and properly entered.
[1: Control NO rot]
no
Autotune
of the current loop for VTC and FOC algorithms.
For the correct operation of the VTC and FOC algorithms, it is possible to perform
this type of tuning if the motor shaft cannot rotate.
During that procedure, current pulses are applied to the motor. The current
amplitude of the current pulses is up to the rated current.
Before performing this procedure, tune motor parameters through
I074
= [0: Motor
Params].
The following parameters are computed:
-
VTC control:
P175t1
(proportional gain of the current control) and
P175u1
(integral time of the current control) through motor measurements.
-
FOC control: current regulator and flux control parameters
P155
,
P156
,
P158
,
P159
.
[2: Control YES
rot]
yes
Autotune
of the rotor time constant (through motor measurements) and the VTC or
FOC control.
For the correct operation of the VTC and FOC algorithms, it is possible to perform
this type of tuning if the motor shaft can rotate with no connected load. If the motor
cannot rotate, perform procedure
I074
= [1: Control NO rot], that does not
automatically estimate the rotor time constant.
During this procedure, current pulses are first applied to the motor when the rotor is
standstill (current pulse amplitude is up to the rated current). Consequently, the
motor is started with no connected load up 70% of the rated speed.
The following parameters are computed:
- for the VTC control,
P175t1
(proportional gain of the current control) and
P175u1
(integral time of the current control) are computed through motor measurements.
- for the FOC control,
P155
,
P156
for the current regulator are computed.
This procedure computes and saves the rotor time constant
C025
through motor
measurements.
NOTE
When the rotor time constant tuning is completed and whenever the value of the time
constant is manually changed, parameters
P158
and
P159
are changed as well based
on the time constant value that has been set up.
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