Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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Parameters Torque control under Real sensorless vector control and vector control
FR-A800 5 - 133
Operation example (when Pr. 804 = "0")
Torque control is possible when actual rotation speed does not exceed the speed limit value.
When the actual speed reaches or exceeds the speed limit value, speed limit is activated, torque con-
trol is stopped and speed control (proportional control) is performed.
The following diagram indicates operation relative to analog input command from the terminal 1
– At STF signal ON, the speed limit value is raised in accordance with the setting of Pr. 7.
– Speed control is performed when the actual speed exceeds the speed limit value.
– At STF signal OFF, the speed limit value is lowered in accordance with the setting of Pr. 8.
– Under torque control, the actual operation speed is a constant speed when the torque command
and load torque are balanced.
– The direction of motor torque generation is determined by a combination of the input torque
command polarity and the start signal, as given in the following table.
I002532E
Fig. 5-41: Transition operation
Polarity of torque
command
Torque generation direction
STF signal ON STR signal ON
+ torque command
Forward direction (forward power driving /
reverse regenerative driving) Reverse direction (forward regenerative
driving / reverse power driving)
- torque command
Reverse direction (forward regenerative
driving / reverse power driving) Forward direction (forward power driving /
reverse regenerative driving)
Tab. 5-46: Motor torque developing direction
∗
∗
∗
OL
STF
Speed limit value
Speed
Speed
Pr. 7
Speed limit
operation
Speed control)
(Forward
rotation
command)
Torque control operation
ON
ON
Speed limit
operation
Speed control)
Speed limit
operation
Speed control)
ON
Torque
control
operation
Pr. 8
Time
*When the speed limit activates, torque according to the commanded is not developed.