Mitsubishi FR-A740-00023-EC - Torque Control by Real Sensorless Vector Control, Vector Control; Torque Control

113
Torque control by real sensorless vector
control, vector control
4
PARAMETERS
4.5 Torque control by real sensorless vector control, vector
control
4.5.1 Torque control
(1) Operation transition
⋅ When "0" is set in Pr. 7 or Pr. 8 , speed control is exercised upon powering off a start signal and the output torque is
limited at the torque limit value.
Purpose Parameter that must be Set Refer to Page
Selection of torque command
source and setting of torque
command value
Torque command Pr. 803 to Pr. 806
117
Prevent the motor overspeed Speed limit Pr. 807 to Pr. 809
119
Improve torque control accuracy
Gain adjustment for
torque control
Pr. 824, Pr. 825, Pr. 834, Pr. 835
122
Stabilize the torque detection signal Torque detection filter Pr. 827, Pr. 837 136
 Torque control is exercised to develop torque as set in the torque command.
 The motor speed becomes constant when the motor output torque and load torque are balanced.
For torque control, therefore, the speed is determined by the load.
 For torque control, the motor gains speed as the motor output torque becomes greater than the motor load.
To prevent overspeed, set the speed limit value so that the motor speed does not increase too high.
(Torque control is disabled under speed limit since speed control is exercised.)
 When speed limit is not set, the speed limit value setting is regarded as 0Hz to disable torque control.
Item Description
Start signal
External operation STF, STR signal
PU operation
and of FR-DU07, FR-PU07 or FR-PU04
Torque command Select the input method of torque command and input the torque command.
Speed limit Select the input method of speed limit and input the speed limit value.
Torque control
Speed limit
Speed limit value is
increased up to preset value
according to the Pr.7
Acceleration time setting.
Speed limit value
Speed limit value is decreased
down to zero according to the Pr.8
Deceleration time setting.
Speed
Start signal
Output torque
Speed limit
Output torque is provided
according to the terminal 1
setting.
Speed control is peformed during speed
limit. (Thus, torque according to the
commanded is not developed.)
Speed limit value
Start signal
Output torque
Speed
Limit at the torque limit value
Torque control
Speed control
(speed limit)
Output torque is provided
according to the terminal 1
setting.