Mitsubishi Electric 800 Series Instruction Manual page 115

 Operation transition
Speed (estimated value)
Start signal
Output torque
• If the setting value of Pr.7 and Pr.8 is "0", turning OFF the start signal enables speed control, and the output torque is
controlled by the torque limit value.
Speed (estimated value)
Start signal
Output torque
Item
Start signal
Torque command
Speed limit
 Operation example
Torque control is enabled when the rotation speed (estimated value) does not exceed the speed limit value.
When the speed (estimated value) reaches or exceeds the speed limit value, speed limit is activated, torque control is stopped,
and speed control (proportional control) is performed.
The operation is as follows.
Speed (estimated value) Speed (estimated value) Speed (estimated value)
(Forward
rotation
command)
(Speed limit)
• At the STF signal ON, the speed limit value is raised in accordance with the setting of Pr.7.
114
6. Torque control
6.1 Torque control
Speed limit value is
increased up to preset value
according to the Pr.7
Acceleration time setting.
Speed limit
Speed control is performed during speed
limit. (Thus, torque according to the
commanded is not developed.)
External operation STF, STR signal
PU operation RUN key of the operation panel
Select the method to give the torque command, and give the torque command.
Select the method to give the speed limit command, and input the speed limit value.
Speed
Pr.7
*
STF
Speed limit operation
(Speed control)
OL
ON
Speed limit value
Torque control
Torque control
Limit at the torque limit value
Description
Speed limit value
Torque control operation Speed limit operation
* When the speed limit activates, torque according to the commanded is not developed.
Speed limit value is decreased
down to zero according to the Pr.8
Deceleration time setting.
Speed limit
The output torque is
determined by the torque
command.
Speed limit value
Speed control
(speed limit)
The output torque is determined
by the torque command.
Pr.8
*
*
Torque
Speed limit operation
control
(Speed control)
(Speed control)
operation
ON ON
Time