Mitsubishi Electronics FR-A700 ユーザーズマニュアル
127
4
(7) Change the torque characteristics in the constant power (Pr. 803)
4.5.5
Speed limit (Pr. 807 to Pr. 809)
(1) Control block diagram
⋅ 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.
power range torque characteristic selection when you want
to keep the torque to be constant even at or above the
base frequency.
♦Parameters referred to♦
Pr. 868 Terminal 1 function assignment
Refer to page 100
Calibration parameter C16 (Pr. 919) to C19 (Pr. 920) (terminal 1 bias, gain torque)
Refer to page 300
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.
command value, etc. during torque control operation.
Parameter
Number
Name
Initial Value
Setting
Range
Description
807
Speed limit selection
0
0
Use the speed command value during speed control
as speed limit.
as speed limit.
1
According to Pr. 808 and Pr. 809 , set the speed limit in
forward and reverse rotation directions individually.
forward and reverse rotation directions individually.
2
Forward/reverse rotation speed limit
The analog voltage of the terminal 1 input is used to
make speed limit.
The speed limit of the forward rotation and reverse
rotation is switched according to the polarity.
The analog voltage of the terminal 1 input is used to
make speed limit.
The speed limit of the forward rotation and reverse
rotation is switched according to the polarity.
808
Forward rotation speed
limit
limit
60Hz
0 to120Hz
Set the speed limit for the forward rotation direction.
809
Reverse rotation speed
limit
limit
9999
0 to120Hz
Set the speed limit of the reverse rotation side.
9999
As set in Pr. 808 .
Speed
Base speed
Torque
Pr. 803 = 1:
constant torque command
Pr. 803 = 0:
constant power command
(torque reduction)
(torque reduction)
Constant power range
Constant torque range
Sensorless
Sensorless
Sensorless
Vector
Vector
Vector
Forward/reverse rotation speed limit
Same method
as speed command input
Parameter(Pr. 808, Pr. 809)
0
1
2
Pr. 807 Speed limit selection
Torque command
+
-
Speed estimated value < speed limit value
+
-
Torque control
Motor
Encoder
Speed estimator
Real sensorless vector control
Vector control
Speed control
(proportional control)
Speed estimated value speed limit value