Torque Limit Level Setting For Speed Control (Pr. 22, Pr. 803, Pr. 810 To Pr. 817, Pr. 858, Pr. 868, Pr. 874) - Mitsubishi Electric FR-A700 Instruction Manual

4.4.3 Torque limit level setting for speed control
(Pr. 22, Pr. 803, Pr. 810 to Pr. 817, Pr. 858, Pr. 868, Pr. 874)
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 functions.
You can select whether the torque limit level is set using parameters or analog input teminals (terminal 1, 4).
In addition, you can set torque limit level for forward (power driving/regeneration) and reverse (power driving/
regeneration) operation individually.
Parameter
Name
Number
Stall prevention operation
22 level
(torque limit level)
Constant power range
803 torque characteristic
selection
Torque limit input method
810
selection
811 Set resolution switchover
Torque limit level
812
(regeneration)
Torque limit level (3rd
813
quadrant)
Torque limit level (4th
814
quadrant)
815 Torque limit level 2
Torque limit level during
816
acceleration
Torque limit level during
817
deceleration
Terminal 4 function
858
assignment
Terminal 1 function
868
assignment
874 OLT level setting
CAUTION
⋅ Under real sensorless vector control, the lower limit of torque limit level is set 30% if the value less than 30% is input.
Speed control by real sensorless vector
Initial Value Setting Range
150/200%* 0 to 400%
0
0
1
0
0
1
0
0
1
10
11
0 to 400%
9999
9999
0 to 400%
9999
9999
0 to 400%
9999
9999
0 to 400%
9999
9999
0 to 400%
9999
9999
0 to 400%
9999
9999
0 0, 4, 9999
0 0, 2 to 5, 9999
150% 0 to 200%
control, vector control
Sensorless Sensorless Sensorless Vector Vector Vector
Description
Set the torque limit level in % on the
assumption that the rated torque is 100%
* For the FR-A720-00175 (FR-A740-00090) or less,
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.
Constant motor
Select the torque limit
output limit
in the constant output
region by torque limit
Constant torque
limit setting.
Internal torque limit (torque limit by parameter
settings)
External torque limit (torque limit by terminal
1, 4)
Speed setting and
running speed
monitor increments Torque limit setting
from the PU, RS- increments
485 communication
Pr. 22, Pr. 812 to Pr. 817
or communication
option.
1r/min
0.1%
0.1r/min
1r/min
0.01%
0.1r/min
Set the torque limit level for forward rotation
regeneration.
Limit at the value of Pr. 22 or analog terminal
Set the torque limit level for reverse rotation
driving.
Limit at the value of Pr. 22 or analog terminal
Set the torque limit level for reverse rotation
regeneration.
Limit at the value of Pr. 22 or analog terminal
When the torque limit selection (TL) signal is
on, the Pr. 815 value is a torque limit value
regardless of Pr. 810 .
Limit at the value of Pr. 22 or analog terminal
Set the torque limit value during acceleration.
Same torque limit as at constant speed
Set the torque limit value during deceleration.
Same torque limit as at constant speed
When "4" is set in, the torque limit can be
changed with a signal to terminal 4.
When "4" is set in, the torque limit can be
changed with a signal to terminal 1.
This function can make an alarm stop if the
torque limit is activated to stall the motor. Set
the output at which an alarm stop is made.
4
99