Selection Of Control Method - Mitsubishi Electric FR-A700 Technical Manual

2.7 Selection of control method

2.7.1 Selection of control method [Pr. 80, 81
V/F control (initial setting), Simple magnetic flux vector
control, Advanced magnetic flux vector control, Real
sensorless vector control and vector control are available.
1) V/F control
common
• It controls frequency and voltage so that the ratio
of frequency (F) to voltage (V) is constant when
changing frequency.
• You can choose energy-saving operation mode
( only), optimum excitation control
A700 F700
(
F700 E700 D700
( only), and elevator mode (
A700 F700
2) Simple magnetic flux vector control
• Providing optimum excitation to the motor can
also produce high torque in a low-speed range.
3) General-purpose
control
E700 D700
• This control divides the inverter output current
into an excitation current and a torque current by
vector calculation
compensation to flow a motor current which
meets the load torque.
4) Advanced magnetic
A700 E700
• This control divides the inverter output current
into an excitation current and a torque current by
vector calculation and makes frequency and
voltage compensation to flow a motor current
which meets the load torque.
5) Real sensorless vector control
• By estimating the motor speed, speed control
and torque control with more advanced current
control function
accuracy and
necessary, select the Real sensorless vector
control and perform offline auto tuning.
• This control can be applied to the following
applications.
• To minimize the speed fluctuation even at a
severe load fluctuation
• To generate low speed torque
• To prevent machine from damage due to too
large torque (torque limit)
• To perform torque control
(*[Pr. 81, 450, 451, 453, 454, 800] are not available for
only), or adjustable 5 points V/F
A700
F700
magnetic flux
and makes voltage
flux vector control
A700
are enabled. When
fast response control
* , 450 * , 451
(*[Pr. 451, 453, 454] are not available for
(*[Pr. 81, 451, 453, 454, 800] are not available for
6) Vector control
• When the FR-A7AP or FR-A7AL is mounted, full-
scale vector control operation can be performed
using a motor with encoder. Fast response/high
accuracy speed control (zero speed control,
servo lock), torque control, and position control
can be performed.
• What is vector control?
It has excellent control characteristics when
compared to V/F control and other control
techniques, achieving the control characteristics
equal to those of DC machines.
only).
• It is suitable for applications below.
• To minimize the speed fluctuation even at a
• To generate low speed torque
vector
• To prevent machine from damage due to too
• To perform torque control or position control
• Servo-lock torque control which generates
high
are
252
* , 453 * , 454 * , 800 * ]
A700
severe load fluctuation
large torque (torque limit)
torque at zero speed
PARAMETER
common
(common)
.)
F700
.)
E700
.)
D700