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Motor brake and stop operation
4
PARAMETERS
4.14 Motor brake and stop operation
4.14.1 DC injection brake and zero speed control, servo lock (LX signal, X13 signal,
Pr. 10 to Pr. 12, Pr. 802, Pr. 850)
* This parameter can be set when the FR-A7AP/FR-A7AL (option) is mounted.
............Specifications differ according to the date assembled. Refer to page 484 to check the SERIAL number.
Purpose Parameter that must be Set Refer to Page
Motor braking torque adjustment
DC injection brake and zero speed
control, servo lock
Pr. 10 to Pr. 12,
Pr. 802, Pr. 850
203
Improve the motor braking torque
with an option
Selection of a regenerative brake Pr. 30, Pr. 70 207
Performing operation by DC current
input
DC current feeding mode Pr. 30 207
Coast the motor to a stop Selection of motor stopping method Pr. 250 213
Used to stop the motor with a
mechanical brake (vibration restraint
at stop-on-contact)
Stop-on-contact control
Pr. 270, Pr. 275,
Pr. 276
214
Used to stop the motor with a
mechanical brake (operation timing
of a mechanical brake)
Brake sequence function
Pr. 278 to Pr. 285,
Pr. 292
217
Perform position stop (orientation)
control of the rotation shaft
Orientation control
Pr. 350 to Pr. 366,
Pr. 369, Pr. 393,
Pr. 396 to Pr. 399
220
The DC injection brake can be operated at a motor stop to adjust the stop timing and braking torque.
Zero speed control can be selected during Real sensorless vector control and either zero speed control or
servo lock can be selected under vector control.
In DC injection brake operation, DC voltage is directly applied to the motor to prevent the motor shaft from
rotating when a motor decelerates to stop. While, in zero speed control, vector control is performed to maintain
0r/min. In either control, the motor will not return to the original position if the motor shaft rotates due to
external force.
The motor shaft position is maintained with servo lock. The motor will return to the original position if the motor
shaft rotates due to external force.
Select the magnetic flux decay output shutoff function to decay the magnetic flux before shutting off the output
at a stop.
Parameter
Number
Name Initial Value Setting Range Description
10
DC injection brake
operation frequency
3Hz
0 to 120Hz
Set the operation frequency of the DC
injection brake (zero speed control, servo
lock).
9999 Operated at Pr. 13 or less.
11
DC injection brake
operation time
0.5s
0
DC injection brake (zero speed control)
disabled
0.1 to 10s
Set the operation time of the DC injection
brake (zero speed control, servo lock).
12
DC injection brake
operation voltage
7.5K or lower 4%
0 to 30%
Set the DC injection brake voltage (torque).
When "0" is set, DC injection brake is disabled.
11K to 55K 2%
75K or higher 1%
802 *
Pre-excitation
selection
0
0 Zero speed control
1Servo lock
850
Brake operation
selection
0
0 DC injection brake operation
1
Zero speed control (during Real sensorless
vector control)
2
Magnetic flux decay output shutoff (during
Real sensorless vector control)