Mitsubishi FR-A800

(G) Control parameters
PARAMETERS
605
5
GROUP
G
5.16.7 DC injection brake, zero speed control, and
servo lock
 Initial value for the FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower.
 Initial values for the FR-A820-00630(11K) to FR-A820-03160(55K), FR-A840-00310(11K) to FR-A840-01800(55K).
 Initial value for the FR-A820-03800(75K) or higher and FR-A840-02160(75K) or higher.
• Timing to stop or braking torque can be adjusted by applying DC injection brake at the time of stopping motor.
Zero speed control can also be selected at the time of the Real sensorless vector control, and zero speed control and
servo lock can be selected at the time of vector control or PM sensorless vector control.
DC injection brake is preventing the motor shaft to turn by applying DC voltage to the motor, and the other hand, zero
speed control is using vector control to maintain 0 r/min. Either way, the motor shaft will not return to its original
position when it is rotated due to external force.
Servo lock will maintain the position of the motor shaft. When a motor shaft is rotated by external force, it goes back to
the original position.
• Select the magnetic flux decay output shutoff function to decay the magnetic flux before shutting off the output at a
stop.
Pr. Name
Initial
value
Setting
range
Description
10
G100
DC injection brake
operation frequency
3 Hz
0 to 120 Hz
Set the operation frequency for the DC injection brake (zero
speed control and servo lock).
9999 Operate at Pr.13 or lower
11
G101
DC injection brake
operation time
0.5 s
0
Without DC injection brake (zero speed control and servo
lock)
0.1 to 10 s
Set the operation time for the DC injection brake (zero speed
control and servo lock).
8888 Operate with X13 signal ON
12
G110
DC injection brake
operation voltage
4%
0 to 30%
Set the DC injection brake voltage (torque). When set to "0",
there will be without DC injection brake.
2%

1%
802
G102
Pre-excitation selection
0
0 Zero speed control
1Servo lock
850
G103
Brake operation
selection
0
0 DC injection brake operation
1 Zero speed control (Real sensorless vector control)
2
Magnetic flux decay output shutoff (Real sensorless vector
control)