Mitsubishi Electric 800 Series Instruction Manual (Function page 147

• Speed control is performed when the actual speed exceeds the speed limit value.
• At the 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
NOTE
• Once the speed limit is activated, speed control is performed and internal torque limit (Pr.22 Torque limit level) is enabled.
(Initial value) In this case, it may not be possible to return to torque control.
Torque limit should be external torque limit (terminal 4). (Refer to
• Under torque control, perform linear acceleration/deceleration (Pr.29 = "0" (initial value)). When acceleration/deceleration
patterns other than the linear acceleration/deceleration are selected, the protective function of the inverter may be activated.
(Refer to
• Performing pre-excitation (LX signal and X13 signal) under torque control may start the motor running at a low speed even
when the start signal (STF or STR) is not input. This product with the start command ON may also rotate the motor at a low
speed when the speed limit value is set to zero. Confirm that the motor running does not cause any safety problems before
performing pre-excitation.
• Under Real sensorless vector control, torque control is not available for regenerative driving in a low-speed range (about 10
Hz or lower) or light-load operation in a low-speed range (about 5 Hz or lower and about 20% or lower of the rated torque).
146
6. Torque Control
6.1 Torque control
STF signal ON
Forward direction (forward power driving / reverse
regenerative driving)
Reverse direction (forward regenerative driving / reverse
power driving)
page 238.)
Torque generation direction
Reverse direction (forward regenerative driving /
reverse power driving)
Forward direction (forward power driving / reverse
regenerative driving)
page 122.)
STR signal ON