Santerno Sinus Penta - Table 68: Programmable Motor Tune Functions

SINUS PENTA
PROGRAMMING GUIDE
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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 comput
ed 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.
Dur
ing 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 w
hen 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 thr
ough 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.