Santerno Sinus Penta - Page 277

PROGRAMMING GUIDE
SINUS PENTA
277/486
C010 (C053, C096) Type of Control Algorithm
C010 (Motor 1)
C053 (Motor 2)
C096 (Motor 3)
Range
0 ÷ 2
0: IFD
1: VTC
2: FOC
Default
0
0: IFD
Level
BASIC
Address
1010
1053
1096
Function
This parameter sets the type of control algorithm to be used.
Type of controls:
0: IFD V/f control
1: VTC Sensorless Vector Torque control
2: FOC Field Oriented Control
The V/f control (IFD)
allows controlling the motor by producing voltage
depending on frequency. It is possible to configure several types of V/f patterns
(see V/f Pattern (IFD Only)).
The Sensorless Vector Control (VTC) and Field Oriented Control (FOC)
are
field-oriented control modes.
The FOC is a closed-
loop control, so a speed transducer is required to detect
the position of the shaft of the connected motor.
The VTC is a control mode w/out speed feedback, s
o no position/speed
transducer is required: based on a dynamic model of an asynchronous motor,
the algorithm estimates the speed and orientation of the motor flux.
Both controllers guarantee segregation between the flux control and the torque
control. In t
hat way, the motor flux is adjusted based on the magnetizing
current, obtained from
No-load current C021 (C064 for motor 2 and C107 for motor 3).
When the VTC or FOC controls are used, the connected motor can
be
controlled either via a torque reference or
via a speed reference; in that case,
the speed control loop, based on the error between reference speed and
measured speed (FOC) or the estimated speed (VTC) is the external control
loop for the torque controller.
The equations used for VTC and FOC contr
ol algorithms require the following
equivalent parameters of the asynchronous device:
stator resistance C022 (C065 for motor 2, C108 for motor 3),
mutual inductance C024 (C067 for motor 2, C110 for motor 3) and
rotor time constant C025 (C068 for motor 2, C111 for motor 3).
As per VTC, the following value is required
leakage inductance C023 (C066 for motor 2 and C109 for motor 3).
NOTE FOC control requires a speed transducer, such as an encoder feedback.
CAUTION
It is not advisable to set VTC and FOC algorithms with a nominal
current motor lower
than 50% of the drive size, otherwise the control performance is not guaranteed.