Mitsubishi Electric FR-A800, Instruction Manual

Page: 308 / 1042

Torque control under Real sensorless vector control and vector control Parameters
5 - 128
NOTES 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 (terminals 1 and 4). (Refer to page 5-84.)
Under torque control, the undervoltage avoidance function (Pr. 261 = "11" or "12"), which is one of
the power failure deceleration stop function, is invalid.
When Pr. 261 = "11 (12)", the operation is performed in the same manner as if Pr. 261 = "1 (2)".
Under torque control, perform linear acceleration/deceleration (Pr. 29 = "0 (initial value)"). The
inverter's protective function may operate for non-linear acceleration/deceleration patterns.
(Refer to page 5-240.)
Performing pre-excitation (LX signal and X13 signal) under torque control (Real sensorless vector
control) may start the motor running at a low speed even when the start command (STF or STR) is
not input The motor may run also at a low speed when the speed limit value = 0 with a start com-
mand input. It must be confirmed that the motor running will not cause any safety problem
before performing pre-excitation.