Mitsubishi Electric FR-E800, Инструкция по эксплуатации

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6. Torque Control
6.1 Torque control
• 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.
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
page 114 .)
• 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
page 201 .)
• 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).
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)