Pre-excitation signal (LX signal)
• When the Pre-excitation/servo ON (LX) signal is turned ON while the motor stops under Real sensorless vector control,
Vector control, or PM sensorless vector control, pre-excitation (zero speed control / servo lock) starts.
• 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 (by using the LX or X13 signal) during torque control (under Real sensorless vector control) may
rotate a motor at a low speed even though a start command (STF or STR) is not input. The inverter at a start command ON
may also rotate the motor at a low speed even though a speed limit value is set to zero. It must be confirmed that the motor
running will not cause any safety problem before performing pre-excitation.
• Note that during the pre-excitation operation, a voltage is applied to the motor even with the FWD/REV indicator OFF on the
operation panel.
• When offline auto tuning (Pr.96 Auto tuning setting/status = "1, 11, or 101") is performed during pre-excitation operation,
pre-excitation is disabled.
CAUTION
• During the orientation operation, do not set "0 or 8888" in Pr.11 and do not set "0" in Pr.12. The motor may not stop
properly.
• Install a mechanical brake to make an emergency stop or to stay stopped for a long time.
Wait until the machine stops completely, and fix the motor with a mechanical brake, then turn the LX signal (pre-
excitation) OFF.
Parameters referred to
Pr.13 Starting
frequencypage
Pr.71 Applied
motorpage 528
Pr.80 Motor
capacitypage 532
Pr.178 to Pr.189 (Input terminal function
Pr.422 Position control gain, Pr.1298 Second position control
5.16.9 Output stop function
The motor coasts to a stop (inverter output is shutoff) when the inverter output frequency falls to Pr.522 setting or lower.
Pr.
522
Output stop frequency
G105
• When both of the frequency setting signal and output frequency fall to the frequency set in Pr.522 or lower, the inverter
stops the output and the motor coasts to a stop.
• The motor re-starts when the frequency setting signal exceeds Pr.522 + 2 Hz and is accelerated at the Pr.13 Starting
frequency (0.01 Hz under PM sensorless vector control).
720
5. PARAMETERS
5.16 (G) Control parameters
Downloaded from
ManualsNet.com
When Pr. 850 = 1
(Hz)
Zero speed control
Servo lock
Normal operation
LX signal
381,
page 382
selection)page 521
Name
Initial value
9999
search engine
Pr. 10
Operation
frequency
Normal operation
Pr. 11
Operation time
ON
gainpage 328
Setting
range
0 to 590 Hz
Set the frequency to start coasting to a stop (output shutoff).
9999
No function
Time
Description