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Motor brake and stop operation
(6) Brake operation selection under vector control (Pr. 802)
⋅ When pre-excitation is performed, select zero speed control or servo lock using Pr. 802.
⋅ The relationship between the DC injection brake operation and pre-excitation operation under each control
(7) Pre-excitation signal (LX signal)
⋅ When the LX signal is turned ON under Real sensorless vector control or vector control, pre-excitation (zero speed
control or servo lock) is exercised during a stop.
⋅ For the terminal used for LX signal input, set "23" in any of Pr. 178 to Pr. 186 to assign the function.
Pr. 802 Setting Pre-excitation Description
0 (initial value) Zero speed control
Even under load, an attempt is made to maintain 0r/min to keep the motor shaft stopped. Note that
if the shaft is overcome and turned by external force, it does not return to the original position.
Position control is not exercised and only speed control is carried out to perform operation.
1 Servo lock
Even under load, an attempt is made to maintain the motor shaft position. Note that if the shaft is
turned by external force, it returns to the original position after the external force has gone away.
Since position control is exercised, you can adjust this position loop gain using
Pr. 422 Position loop gain
.
Control Method Control Mode Pr. 802 Pr. 850 Decelerates to Stop LX-ON
X13-ON
(Pr. 11 = "8888")
V/F control ⎯⎯⎯DC Injection brake ⎯ DC Injection brake
Advanced magnetic flux
vector control
⎯⎯⎯DC Injection brake ⎯ DC Injection brake
Real sensorless vector
control
Speed
⎯ 0 DC Injection brake
Zero speed Zero speed
⎯ 1 Zero speed
⎯ 2
Magnetic flux decay
output shutoff
Zero speed Zero speed
Torque
⎯ 0 DC Injection brake
Zero speed Zero speed
⎯ 1 Zero speed
⎯ 2
Magnetic flux decay
output shutoff
Zero speed Zero speed
Vector control
Speed
0 ⎯ Zero speed Zero speed Zero speed
1 ⎯ Servo lock Servo lock Servo lock
Torque ⎯⎯ Zero speed Zero speed Zero speed
Position ⎯⎯ ⎯ Servo lock ⎯
CAUTION
⋅ 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. Perform pre-excitation after making sure that there will be no problem in
safety if the motor runs.
⋅ Although FWD/REV of the operation panel is not lit during pre-excitation, note that voltage is applied to the motor.
⋅ Note that when offline auto tuning (Pr. 96 Auto tuning setting/status = "1 or 101") is performed during pre-excitation, offline auto
tuning is not executed but the motor starts.
CAUTION
Do not set
Pr. 11
to "0, 8888" and
Pr. 12
to "0" under orientation operation. Otherwise, the motor will not stop properly.
As stop holding torque is not produced, install a mechanical brake.
After the machine stops fully and the mechanical brake is applied, switch the LX signal (pre-excitation) OFF.
♦ Parameters referred to ♦
Pr. 13 Starting frequency Refer to page 175
Pr. 71 Applied motor Refer to page 187
Pr. 178 to Pr. 189 (Input terminal function selection) Refer to page 231
Pr. 422 Position loop gain Refer to page 141
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