(G) Control parameters
610
PARAMETERS
Pre-excitation signal (LX signal)
• When the Pre-excitation/servo ON (LX) signal is turned ON at the time of Real sensorless vector control, vector control, or
PM sensorless vector control, pre-excitation (zero speed control, servo lock) will be ON while stopped.
• To input the LX signal, set "23" in any of Pr.178 to Pr.189 (input terminal function selection) to assign the function.
NOTE
• Changing the terminal assignment using Pr.178 to Pr.189 (input terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
• 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 command input. It must be confirmed that the motor running will not cause
any safety problem before performing pre-excitation.
• At the time of pre-excitation operation, the FWD/REV on the operation panel will not light up, but voltage is applied to the
motor, so take caution.
• When offline auto tuning (Pr.96 Auto tuning setting/status = "1, 11, 101") is executed at the time of pre-excitation operation,
pre-excitation is disabled.
Pr.13 Starting frequency page 298, page 299
Pr.71 Applied motor page 438
Pr.80 Motor capacity page 442
Pr.178 to Pr.182 (input terminal function selection) page 430
Pr.422 Position control gain page 251
Caution
Do not set Pr.11 to "0, 8888" and Pr.12 to "0" at the time of orientation operation. The motor may not
stop properly.
Install a mechanical brake to make an emergency stop or to stay stopped for a long time.
After the machine comes to a full stop and the motor is fixed by the mechanical brake, turn OFF the
LX signal (pre-excitation).
Operation
frequency
Time
Pr. 10
Zero speed control
Servo lock
When Pr. 850 = 1
Operation time
ON
Normal operation
Normal operation
Pr. 11
(Hz)
Output frequency
LX signal
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