Mitsubishi Electric FR-A720-00030-NA Instruction Manual page 111

Speed control by Real sensorless vector
control, vector control
(1) Torque limit block diagram
<Vector control>
Speed command +
(2) Selection of torque limit input method (Pr. 810)
 Set Pr. 810 Torque limit input method selection to select the method to limit output torque during speed control.
Torque limit by parameter setting is initially set.
Parameter Setting Torque Limit Input
Number Range
0 (initial
810
value)
1
(3) Torque limit level by parameter setting (Pr. 810 = "0"
Torque limit
+
Reverse
regeneration
Reverse
quad4
rotation
( Pr. 814)
quad3
( Pr. 813)
Reverse
driving
-
Rated speed
(4) Torque limit level by analog input (terminal 1, 4) (Pr. 810 = "1", Pr. 858, Pr. 868 )
 With the upper limit of torque limit as set in Pr. 22, the analog input from terminal 1 input is used as the torque limit
value within the Pr. 22 setting range.
 When torque limit value is input to terminal 1, set "4" in Pr. 868 Terminal 1 function assignment. When torque limit value
is input from terminal 4, set "4" in Pr. 858 Terminal 4 function assignment.
 When Pr. 858="4" and Pr. 868="2," torque is limited by analog input to terminal 1 for regeneration and to terminal 4 for
driving.
 Torque limit by analog input can be calibrated using calibration parameter C16 (Pr. 919) to C19 (Pr. 920), C38 (Pr. 932) to
C41 (Pr. 933) . (Refer to page 305)
Torque limit
+
Reverse
regeneration
Reverse
quad4
rotation
( Pr. 814)
*
quad3
*
( Pr. 813)
Reverse
driving
Rated speed
* Analog input (terminal 1, 4) or internal torque control (Pr. 22 etc.) whichever is smaller
100
Speed control
-
Method
Parameter-set torque limit operation is performed.
Internal torque limit Changing the torque limit parameter value by communication enables torque limit
to be input by communication.
External torque limit Torque limit using analog voltage (current) to terminal 1 or terminal 4 is enabled.
Forward
driving
Forward
quad1
( Pr. 22) rotation
Speed
quad2
( Pr. 812)
Forward
regeneration
Forward
driving
Forward
quad1
( Pr. 22) rotation
*
Speed
quad2
*
( Pr. 812)
Forward
regeneration
-
Torque limit
Iq current control
Description
Pr. 812 to Pr. 814 )
,
 In the initial setting, limit is made ON all quadrants on the Pr.
22 Stall prevention operation level (torque limit level) .
 When you want to set the level on a quadrant basis, set the
torque limit level in Pr. 812 Torque limit level (regeneration), Pr.
813 Torque limit level (3rd quadrant), Pr. 814 Torque limit level
(4th quadrant).
When "9999" is set, Pr. 22 is the torque limit level.
When Pr.858=4, Pr.868=2
Torque limit
+
Reverse
regeneration
Terminal 1 input or
internal torque limit
(Pr.22 etc.) whichever
is smaller
quad4
Reverse rotation
Speed
quad3
Terminal 4 input or
internal torque limit
(Pr.22 etc.) whichever
is smaller
Reverse
driving
Rated speed
IM
Encoder
Forward
driving
Terminal 4 input or
internal torque limit
(Pr.22 etc.) whichever
is smaller
quad1
Forward rotation
quad2
Terminal 1 input or
internal torque limit
(Pr.22 etc.) whichever
is smaller
Forward
regeneration
-