Torque Limit Level Setting For Speed Control (Pr. 22, Pr. 157, Pr. 803, Pr. 810 To Pr. 817, Pr. 858, Pr. 868, Pr. 874) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

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 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
Name
Number
Stall prevention operation
22* level
(torque limit level)
157 OL signal output timer
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
* 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.
CAUTION
⋅ Under Real sensorless vector control, the lower limit of torque limit level is set 30% if the value less than 30% is input.
100
Initial Value Setting Range
150/200%* 0 to 400%
0 to 25s
0s
9999
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, 1, 4, 9999
0 0, 2 to 5, 9999
150% 0 to 200%
Sensorless Sensorless Sensorless
Description
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.
Set the output start time of the OL signal output
when torque limit is activated.
Without the OL signal output
Constant motor output Select the torque limit in
limit 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
Torque limit setting
increments from the
increments
PU, RS-485
Pr. 22, Pr. 812 to Pr. 817
communication 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 .
The torque limit set to Pr. 810 is valid.
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 inverter trip if the
torque limit is activated to stall the motor. Set the
output at which an inverter trip is made.
Vector Vector Vector