Motor Brake And Stop Operation; Dc Injection Brake And Zero Speed Control, Servo Lock (Lx Signal, X13 Signal, Pr. 10 To Pr. 12, Pr. 802, Pr. 850) - Mitsubishi Electric FR-A720-00030-NA Instruction Manual

Motor brake and stop operation

4.14 Motor brake and stop operation

Purpose
Motor braking torque adjustment
Improve the motor braking torque
with an option
Performing operation by DC current
input
Coast the motor to a stop
Used to stop the motor with a
mechanical brake (vibration restraint
at stop-on-contact)
Used to stop the motor with a
mechanical brake (operation timing
of a mechanical brake)
Perform position stop (orientation)
control of the rotation shaft
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)
 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
Name
Number
DC injection brake
10
operation frequency
DC injection brake
11
operation time
DC injection brake
12
operation voltage
Pre-excitation
802 *
selection
850
Brake operation
selection
* This parameter can be set when the FR-A7AP/FR-A7AL (option) is mounted.
............ Specifications differ according to the date assembled. Refer to page 491 to check the SERIAL number.
206
Parameter that must be Set
DC injection brake and zero speed
control, servo lock
Selection of a regenerative brake
DC current feeding mode
Selection of motor stopping method
Stop-on-contact control
Brake sequence function
Orientation control
Initial Value
Setting Range
200V class (400V class)
0 to 120Hz
3Hz
0.5s
0.1 to 10s
00330 (00170)
4%
or less
00460(00230) to
2%
02150(01100)
02880 (01440)
1%
or more
0
0
Pr. 10 to Pr. 12,
Pr. 802, Pr. 850
Pr. 30, Pr. 70
Pr. 30
Pr. 250
Pr. 270, Pr. 275,
Pr. 276
Pr. 278 to Pr. 285,
Pr. 292
Pr. 350 to Pr. 366,
Pr. 369, Pr. 393,
Pr. 396 to Pr. 399
Set the operation frequency of the DC
injection brake (zero speed control, servo
lock).
9999 Operated at Pr. 13 or less.
DC injection brake (zero speed control)
0
disabled
Set the operation time of the DC injection
brake (zero speed control, servo lock).
8888 Operate when X13 signal is on
Set the DC injection brake voltage (torque).
0 to 30%
When "0" is set, DC injection brake is disabled.
0 Zero speed control
1 Servo lock
0 DC injection brake operation
1 Zero speed control
2 Magnetic flux decay output shutoff
Refer to Page
206
211
211
217
218
221
224
Description