Mitsubishi Electric FR-A700 Series, Technical Manual

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2
P
ARAM
ETE
R
PARAMETER
2.9.2 Torque limit level setting [Pr. 22, 406, 803, 810 to 817, 858, 865, 868, 874]
(A700)
This function limits the output torque to the predetermined
value during speed control under Real sensorless vector
control and vector control.
In [
Pr. 810 Torque limit input method selection ], you can select
whether to set the torque limit level using parameters ([ Pr.
22(Pr. 812 to 814) ]) or using analog input terminals (terminal
1, 4, terminal 6 (FR-A7AZ)).
Turning TL signal ON sets [
Pr. 815 Torque limit level 2 ] as the
torque limit level.
In addition, you can set torque limit level for forward (power
driving/regeneration) and reverse (power driving/
regeneration) operation individually.
Under Real sensorless vector control, the lower limit of
torque limit level is set 30% if the value less than 30% is
input.
A700
[ Pr. ] Name Initial Value Setting Range Description
22
Stall prevention operation level
(Torque limit level)
150/200%
*1
0 to 400%
Set the torque limit level in % on the assumption that the rated
torque is 100%.
*1
For the 3.7K 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.
406
High resolution analog input
selection
9999 0, 2 to 6, 9999
When the setting value is "4", torque limit level can be
changed with a signal to terminal 6.
When the setting value is "2", regenerative torque limit level
can be changed with a signal to terminal 6.
803
Constant power range torque
characteristic selection
0
0
Constant motor output limit Select the torque limit in the
constant power range by
torque limit setting.
1 Constant torque limit
810 Torque limit input method selection 0
0
Internal torque limit
(Torque limit by parameter setting)
1
External torque limit
(Torque limit by terminal 1, 4*)
811
Set resolution switchover
0
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
]
1r/min
0.1%
1
0.1r/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
[ Pr. 22 ]/limit at the analog terminal value
813
Torque limit level (3rd quadrant)
9999
0 to 400%
Set the torque limit level for reverse rotation driving.
9999 [ Pr. 22 ]/limit at the analog terminal value
814 Torque limit level (4th quadrant) 9999
0 to 400% Set the torque limit level for reverse rotation regeneration.
9999
[ Pr. 22 ]/limit at the analog terminal value
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
Torque limit set in [ Pr. 810 ] is valid.
816
Acceleration torque limit level
9999
0 to 400% Set the torque limit value during acceleration.
9999 Same torque limit as at constant speed
817 Deceleration torque limit level 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, 4, 9999
When 4 is set, the torque limit can be changed with a signal to
terminal 4.
865 Low speed detection 1.5H
Z
0 to 400H
Z
The low speed detection signal (LS) is output when the output
frequency decreases below the setting.
868
Terminal 1 function assignment
0 0 to 6, 9999
When 4 is set, the torque limit can be changed with a signal to
terminal 1.
When 2 is set, the regenerative 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 level for a trip.
* When FR-A7AZ is installed, torque limit from terminal 6 is also available.