196
Motor brake and stop operation
(3) Operation voltage (torque) setting (Pr. 12)
⋅ Use Pr. 12 to set the percentage to the power supply voltage. (This parameter is not used during zero speed control
or servo lock.)
⋅ When Pr. 12 = "0%", the DC injection brake is not operated. (At a stop, the motor coasts.)
⋅ When using the constant-torque motor (SF-JRCA) and energy saving motor (SF-HR, SF-HRCA), change the Pr. 12
setting as follows.
SF-JRCA: 00126 or less ...4%, 00170 to 01800...2%
SF-HR, SF-HRCA: 00126 or less...4%, 00170, 00250...3%, 00310 to 01800...2%
(00770...1.5%)
(4) Brake operation selection during real sensorless vector control (Pr. 850)
⋅ You can select DC injection brake (initial value) or zero speed control for brake operation during real sensorless
vector control.
When Pr. 850 = "1", zero speed control is exercised when the frequency reaches or decreases below the frequency
set in Pr. 10.
(5) 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
REMARKS
⋅ For the 00170 and 00250, when the Pr. 12 setting is as below, changing the Pr. 71 Applied motor setting changes the Pr. 12
setting automatically, it is not necessary to change the Pr. 12 setting.
(a) When Pr. 12 is 4% (initial value)
The Pr. 12 setting is automatically changed to 2% if the Pr. 71 value is changed from the value selecting the standard motor
(0, 2 to 8, 20, 23, 24, 40, 43, 44) to the value selecting the constant torque motor (1, 13 to 18, 50, 53, 54).
(b) When Pr. 12 is 2%
The Pr. 12 setting is automatically changed to 4% (initial value) if the Pr. 71 value is changed from the value selecting the
constant torque motor (1, 13 to 18, 50, 53, 54) to the value selecting the standard motor (0, 2 to 8, 20, 23, 24, 40, 43, 44).
REMARKS
⋅ When the X13 signal is on with Pr. 11 = "8888", zero speed control is activated regardless of setting of Pr. 850 Brake operation
selection.
⋅ When restarting from brake operation during real sensorless vector control, set "1" (zero speed control) in Pr. 850. When the
setting value is "0" (DC injection brake), it may take approx. 2s until frequency is actually output from when the start command
is input.
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.
1Servo 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
Tor qu e
⎯ 0 DC Injection brake
Zero speed Zero speed
⎯ 1 Zero speed
Vector control
Speed
0 ⎯ Zero speed Zero speed Zero speed
1 ⎯ Servo lock Servo lock Servo lock
Tor qu e ⎯⎯ Zero speed Zero speed Zero speed
Position ⎯⎯ ⎯ Servo lock ⎯
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