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Speed control by Real sensorless vector
control, vector control
4.4.3 Torque limit level setting for speed control
(Pr. 22, Pr. 157, Pr. 803, Pr. 810 to Pr. 817, Pr. 858, Pr. 868, Pr. 874)
* This parameter allows its setting to be changed during operation in any operation mode even if "0 (initial value) or 1" is set in Pr. 77 Parameter write
selection.
This function limits the output torque to the predetermined value during speed control under Real sensorless
vector control or vector control.
Set the torque limit level within the range 0 to 400% in Pr. 22.
When the TL signal is turned ON, torque limit level 2 is activated.
You can select whether the torque limit level is set using parameters or analog input terminals (terminal 1, 4).
In addition, you can set torque limit level for forward (power driving/regeneration) and reverse (power driving/
regeneration) operation individually.
Parameter
Number
Name Initial Value Setting Range Description
22*
Stall prevention operation
level
(torque limit level)
150/200%* 0 to 400%
Set the torque limit level in % on the assumption
that the rated torque is 100%
* For the 3.7K or lower, the value changes from 150% to
200% when V/F control or Advanced magnetic flux
vector control is changed to Real sensorless vector
control or vector control.
157 OL signal output timer
0s
0 to 25s
Set the output start time of the OL signal output
when torque limit is activated.
9999 Without the OL signal output
803
Constant power range
torque characteristic
selection
0
0
Constant motor output
limit
Select the torque limit in
the constant output
region by torque limit
setting.
1 Constant torque limit
810
Torque limit input method
selection
0
0
Internal torque limit (torque limit by parameter
settings)
1
External torque limit (torque limit by terminal 1, 4)
811 Set resolution switchover
0
Speed setting and
running speed monitor
increments from the
PU, RS-485
communication or
communication option.
Torque limit setting
increments
Pr. 22, Pr. 812 to Pr. 817
01r/min
0.1%
10.1r/min
10 1r/min
0.01%
11 0.1r/min
812
Torque limit level
(regeneration)
9999
0 to 400%
Set the torque limit level for forward rotation
regeneration.
9999 Limit at the value of Pr. 22 or analog terminal.
813
Torque limit level (3rd
quadrant)
9999
0 to 400% Set the torque limit level for reverse rotation driving.
9999 Limit at the value of Pr. 22 or analog terminal.
814
Torque limit level (4th
quadrant)
9999
0 to 400%
Set the torque limit level for reverse rotation
regeneration.
9999 Limit at the value of Pr. 22 or analog terminal.
815 Torque limit level 2
9999
0 to 400%
When the torque limit selection (TL) signal is
ON, the Pr. 815 value is a torque limit value
regardless of Pr. 810 .
9999 The torque limit set to Pr. 810 is valid.
816
Torque limit level during
acceleration
9999
0 to 400% Set the torque limit value during acceleration.
9999 Same torque limit as at constant speed
817
Torque limit level during
deceleration
9999
0 to 400% Set the torque limit value during deceleration.
9999 Same torque limit as at constant speed
858
Terminal 4 function
assignment
0 0, 1, 4, 9999
When "4" is set in, the torque limit can be
changed with a signal to terminal 4.
868
Terminal 1 function
assignment
0 0, 2 to 5, 9999
When "4" is set in, the torque limit can be
changed with a signal to terminal 1.
874 OLT level setting
150% 0 to 200%
This function can make an inverter trip if the
torque limit is activated to stall the motor. Set the
output at which an inverter trip is made.
CAUTION
⋅ Under Real sensorless vector control, the lower limit of torque limit level is set 30% if the value less than 30% is input.
Sensorless
Sensorless
Sensorless
Vector
Vector
Vector