Mitsubishi Electric 800 Series Instruction Manual page 118

• Speed control is performed when the speed (estimated value) 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 speed (estimated value) 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
Forward direction (forward power driving / reverse
+ torque command
regenerative driving)
Reverse direction (forward regenerative driving / reverse
- torque command
power driving)
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 page 169.)
• 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.
• 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).
Torque generation direction
STF signal ON STR signal ON
Reverse direction (forward regenerative driving /
reverse power driving)
Forward direction (forward power driving / reverse
regenerative driving)
page 102.)
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6. Torque Control
6.1 Torque control