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Torque control by Real sensorless
vector control, vector control
(7) Change the torque characteristics in the constant power (Pr. 803)
Torque
Constant power range
Constant torque range
Base speed
Parameters referred to
Pr. 868 Terminal 1 function assignment
Calibration parameter C16 (Pr. 919) to C19 (Pr. 920) (terminal 1 bias, gain torque)
4.5.5
Speed limit (Pr. 807 to Pr. 809)
Set the speed limit value to prevent overspeed of the motor in case the load torque becomes less than the torque
command value, etc. during torque control operation.
Parameter
Name
Number
807
Speed limit selection
Forward rotation speed
808
limit
Reverse rotation speed
809
limit
(1) Control block diagram
Same method
as speed command input
Parameter(Pr. 808, Pr. 809)
Forward/reverse rotation speed limit
126
Pr. 803 = 1:
constant torque command
Pr. 803 = 0:
constant power command
(torque reduction)
Speed
Refer to page 99.
Sensorless
Sensorless
Sensorless
Initial Value
0
60Hz
9999
Speed estimated value < speed limit value
Torque command
Pr. 807 Speed limit selection
0
1
+
2
Speed estimated value
-
Real sensorless vector control
Due to the motor characteristics, torque is reduced at or
above the base frequency. Set "1" in Pr. 803 Constant
power range torque characteristic selection when you want
to keep the torque to be constant even at or above the
base frequency.
Refer to page 305
Vector
Vector
Vector
Setting
Range
Use the speed command value during speed control
0
as speed limit.
According to Pr. 808 and Pr. 809 , set the speed limit in
1
forward and reverse rotation directions individually.
Forward/reverse rotation speed limit
The analog voltage of the terminal 1 input is used to
2
make speed limit.
The speed limit of the forward rotation and reverse
rotation is switched according to the polarity.
0 to120Hz
Set the speed limit for the forward rotation direction.
0 to120Hz
Set the speed limit of the reverse rotation side.
9999
As set in Pr. 808 .
Speed control
(proportional control)
speed limit value
Speed estimator
Vector control
Description
+
Torque control
-
Motor
Encoder
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