Mitsubishi Electric FR-A820-00046 Instruction Manual page 307

Parameters
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
(Forward
rotation
command)
Fig. 5-41:
– 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.
Polarity of torque
command
+ torque command
- torque command
Tab. 5-46:
FR-A800
Torque control under Real sensorless vector control and vector control
Speed
Pr. 7
∗
Speed
STF
Speed limit
Torque control operation
operation
Speed control)
OL ON
Transition operation
STF signal ON
Forward direction (forward power driving /
reverse regenerative driving)
Reverse direction (forward regenerative
driving / reverse power driving)
Motor torque developing direction
Speed limit value
∗
Speed limit
operation
Speed control)
ON
*When the speed limit activates, torque according to the commanded is not developed.
Torque generation direction
STR signal ON
Reverse direction (forward regenerative
driving / reverse power driving)
Forward direction (forward power driving /
reverse regenerative driving)
Pr. 8
∗
Time
Torque
Speed limit
control
operation
operation
Speed control)
ON
I002532E
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