Mitsubishi Electric FR-A700 Technical Manual page 227

2.7.5 Real sensorless vector control [Pr. 71, 80, 81, 450, 451, 453, 454, 800]
Real sensorless vector control is the control method which
divides the inverter output current into an excitation current
and a torque current by vector calculation, and improves low
torque, speed control range, and speed response by
controlling frequency and voltage optimally to flow a motor
current which meets the load torque, achieving maximum of
200% (3.7kW or less) high torque at 0.3Hz.
[Pr. ] Name
71 Applied motor
80 Motor capacity
81 Number of motor poles
450 Second applied motor
Second motor control
451
method selection
453 Second motor capacity
Number of second motor
454
poles
800 Control method selection
* Use [Pr. 178 to Pr. 189] to assign the terminals used for the X18 and MC signal.
** When [Pr. 80 Motor capacity = 9999] or [Pr. 81 Number of motor poles = 9999], control method is V/F control regardless of the [Pr. 800] setting.
(1) Conditions of Real sensorless vector
control selection
Real sensorless vector control may only be utilized
effectively when all of the following conditions are
satisfied.
If any of the conditions cannot be satisfied, torque
shortage, speed fluctuation or another fault may
occur. Operate under V/F control in that case.
The motor capacity should be equal to or one rank
lower than the inverter capacity.
Note that the motor capacity should be 0.4kW or
more.
Perform offline auto tuning (refer to page 268)
independently of the Mitsubishi motor and other
manufacturer's motor.
Single-motor operation (one motor run by one
inverter) should be performed.
(2) Selection method of Real sensorless
vector control
Set any of 10 to 12 in [Pr. 800 Control method selection].
Setting any value other than 9999 in [Pr. 80 Motor
capacity] and [Pr. 81 Number of motor poles] selects
Real sensorless vector control. V/F control is chosen
when either of the [Pr. 80 or Pr. 81] setting is 9999.
Initial
Setting Range
Value
0 to 8, 13 to 18, 20, 23, 24, 30,
0
33, 34, 40, 43, 44, 50, 53, 54
55K or less 0.4 to 55kW
9999 75K or more 0 to 3600kW
9999
2, 4, 6, 8, 10
9999 12, 14, 16, 18, 20
9999
0 to 8, 13 to 18, 20, 23, 24, 30,
9999
33, 34, 40, 43, 44, 50, 53, 54
9999
10, 11, 12
9999
20, 9999
55K or less 0.4 to 55kW
9999 75K or more 0 to 3600kW
9999
2, 4, 6, 8, 10
9999
9999
0 to 5
9
20
10, 11, 12
20
261
It responds to the load variation quickly (high response) by
torque current control and torque control is also enabled by
giving torque command.
Description
By selecting a standard motor or constant torque motor,
thermal characteristic and motor constants of each motor
are set.
Set the applied motor capacity.
V/F control
Set the number of motor poles.
X18 signal-ON:
Set 10 + number of motor poles.
V/F control *
V/F control
Set when using the second motor.
(Same specifications as [Pr. 71] )
Function invalid ([Pr. 71] is valid.)
Real sensorless vector control
V/F control (Advanced magnetic flux vector control)
Set the capacity of the second motor.
V/F control
Set the number of poles of the second motor.
V/F control
Vector control
Vector control test operation
V/F control **
Real sensorless vector control
Advanced magnetic flux vector control
When [Pr. 81 = 12, 14, 16, 18, 20], you can select
between V/F control and Real sensorless vector
control by switching ON/OFF the X18 signal.
Set [Pr. 71] according to the motor used. Perform
offline auto tuning without fail to perform Real
sensorless vector control even using the Mitsubishi
motor.
Motor
SF-JR
Mitsubishi standard
motor SF-JR 4P 1.5kW or less
Mitsubishi high SF-HR
efficiency motor
Others
SF-JRCA
Mitsubishi constant-
SF-HRCA
torque motor
Others (SF-JRC etc.)
Other manufacturer's
—
standard motor
Other manufacturer's
constant-torque —
motor
*1 For other settings of [Pr. 71], refer to page 266.
*2 Refer to page 268 for offline auto tuning.
After setting [Pr. 9, 83, 84], set [Pr. 96 = 1 or 101] to
perform offline auto tuning. For details, refer to page
268.
PARAMETER
A700
(A700)
2
[Pr. 71] Remarks
*1
3
23
43
3
13
Offline
53
auto tuning is
13
necessary. *2
3
13