Torque Bias Function; Excitation Ratio; Function Assignment Of Analog Input Terminal - Mitsubishi Electric FR-A700 Manual

Pr.
Pr.
830
Refer to the section about Pr.820.
Pr.
Pr.
831
Refer to the section about Pr.821.
Pr.
Pr.
832
Refer to the section about Pr.74.
Pr.
Pr.
833
Refer to the section about Pr.823.
Pr.
Pr.
834
Refer to the section about Pr.824.
Pr.
Pr.
835
Refer to the section about Pr.825.
Pr. Pr.
836
Refer to the section about Pr.74.
Pr. Pr.
837
Refer to the section about Pr.827.
Pr.
Pr.
840 to 848

Torque bias function

Pr.840 Torque bias selection
Pr.842 Torque bias 2
Pr.844 Torque bias filter
Pr.846 Torque bias balance compensation
Pr.848 Fall-time torque bias terminal 1 gain
This function accelerates the rise of the torque at a start. Adjust
the torque at a motor start using the contact signals or analog
signals.
Pr.840 Setting
Set the contact signal (X42, X43) based-torque bias amount
0
using Pr.841 to Pr.843.
Set the terminal 1-based torque bias amount as desired in C16
1
to C19. (forward rotation)
Set the terminal 1-based torque bias amount as desired in C16
2
to C19. (reverse rotation)
The terminal 1-based torque bias amount can be set
3
automatically in C16 to C19, Pr.846 according to the load.
9999
Without torque bias, rated torque 100%
(initial value)
Pr.841 Torque bias 1, Pr.842 Torque bias 2, Pr.843 Torque bias 3
On the assumption that the rated torque is 100%, the torque
bias setting of 1000% is the center value of torque and the bias
value is "0".
Pr.844 Torque bias filter
You can make a torque rise gentler. At this time, the torque rises
according to the time constant of the primary delay filter.
Pr.845 Torque bias operation time
Set the time for output torque be maintained with the torque bias
command value alone.
Pr.846 Torque bias balance compensation
Set the voltage of the torque bias analog input value input to the
terminal 1 to compensate for the balance of the torque bias amount.
Pr.847 Fall-time torque bias terminal 1 bias
Set the torque bias amount at a fall time (when the motor runs in
the reverse rotation direction).
Pr.848 Fall-time torque bias terminal 1 gain
Set the torque bias amount at a fall time.
Pr.
Pr.
849
Refer to the section about Pr.74.
Pr.
Pr.
850
Refer to the section about Pr.10.
Pr.
Pr.
853
Refer to the section about Pr.285.
71
When setting parameters, refer to the instruction manual (applied) and understand instructions.
Vector Vector Vector
Pr.841 Torque bias 1
Pr.843 Torque bias 3
Pr.845 Torque bias operation time
Pr.847 Fall-time torque bias terminal 1 bias
Description
Pr.
Pr.
854

Excitation ratio

Sensorless Sensorless Sensorless
Pr.854 Excitation ratio
Decrease the excitation ratio when you want to improve
efficiency under light load. (motor magnetic noise decreases)
Note that the rise of output torque becomes slow if excitation
ratio is decreased.
This function is appropriate for applications as machine tools
which repeat rapid acceleration/deceleration up to high speed.
Excitation ratio
[%]
100
(Initial value)
Pr.854
setting
0
Pr. Pr.
858, 868

Function assignment of analog input terminal

Pr.858 Terminal 4 function assignment
Function assignment of terminal 1 and terminal 4 of analog input
can be selected and changed by parameter.
Terminal 1 function according to control
V/F Control Real Sensorless Vector Control
Pr.868
Magnetic Flux
Setting
Vector Control Speed control
0
Frequency Speed setting
(initial
setting auxiliary auxiliary
value)
Magnetic flux
1 —
command
Regenerative
2 — torque limit
(Pr.810 = 1)
3 — —
Stall prevention
operation level Torque limit
4
input (Pr.810 = 1)
(Pr.810 = 1)
5 — —
Torque bias
6 — input
(Pr.840 =1,2,3)
9999 — —
* Position control is valid only during vector control
Terminal 4 function according to control
V/F Control Real Sensorless Vector Control
Pr.858
Magnetic Flux
Setting
Vector Control Speed control
0 Frequency Speed
(initial command command
value) (AU signal-ON) (AU signal-ON)
Magnetic flux
1 —
command
Stall prevention
operation level Torque limit
4
input (Pr.810 = 1)
(Pr.810 = 1)
9999 — —
* Position control is valid only during vector control

:No function
Pr.
Pr.
859, 860
Refer to the section about Pr.82.
Vector Vector Vector
100 Load[%]
Pr.868 Terminal 1 function assignment
/Vector Control
Torque control Position control*
Speed limit
—
auxiliary
Magnetic flux Magnetic flux
command command
Regenerative
— torque limit
(Pr.810 = 1)
Torque
command —
(Pr.804 = 0)
Torque
Torque limit
command
(Pr.810 = 1)
(Pr.804 = 0)
Forward/
reverse rotation —
speed limit
— —
— —
/vector Control
Torque control Position control*
Speed limit
—
(AU signal-ON)
Magnetic flux Magnetic flux
command command
Torque limit
—
(Pr.810 = 1)
— —