Mitsubishi FR-A800

Speed control under Real sensorless vector control, vector control, PM sensorless vector
control
186
PARAMETERS
NOTE
• The lower limit for the torque limit level under Real sensorless vector control is set to 30% even if a value lower than 30% is
set.
• When the low-speed range high-torque characteristic is disabled under PM sensorless vector control (Pr.788="0"), the torque
limit is not activated in a low-speed range with a rated frequency of less than 10%.
• Under PM sensorless vector control, the torque limit level is reduced inversely proportional to the output frequency in the
constant output range of the rated motor frequency or higher.
Block diagram of torque limit
Selecting the torque limit input method (Pr.810)
• Use Pr.810 Torque limit input method selection to select which method to use to limit the output torque during speed
control.
Torque limit level using parameter settings (Pr.810 = "0", Pr.812 to
Pr.814)
• In the initial value, a limit is applied to all quadrants with Pr.22 Stall prevention operation level (Torque limit level).
• To set individually for each quadrant, use 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 setting is regarded as torque limit level in
all the quadrants.
Pr.810 setting
Torque limit input
method
Operation
0 (Initial value) Internal torque limit
Perform the torque limit operation using the parameter (Pr.22, Pr.812 to Pr.814) settings.
If changing the torque limit parameters via communication is enabled, the torque limit
input can be performed via communication.
1 External torque limit Torque limit using analog voltage (current) to terminal 1 or terminal 4 is valid.
Torque limit
<Vector control>
Speed control
Speed command
+
-
Iq current control
IM
Encoder
quad1
(Pr.22)
quad4
(Pr.814)
(Pr.813)
quad2
(Pr.812)
Reverse
rotation
Forward
rotation
Torque limit
Speed
Reverse
driving
Reverse
regeneration
Rated speed
quad3
+
-
Forward
regeneration
Forward
driving