Dc Injection Brake, Zero Speed Control, And Servo Lock - Mitsubishi Electric FR-A800 Series Instruction Manual

• Use Pr.674 SF-PR slip amount adjustment gain to fine-tune the rotations per minute. To reduce the rotations per minute
(to increase the compensation frequency), set a larger value in Pr.674. To increase the rotations per minute (to reduce the
compensation frequency), set a smaller value in Pr.674. (Lower rotations per minute reduce the power consumption, and
higher rotations per minute increase the power consumption.)
NOTE
• The slip amount adjustment is not available in the following conditions.
During acceleration/deceleration, during DC injection brake operation, during PID control, during orientation control, during
encoder feedback control, during stall prevention operation, during regeneration avoidance operation, during traverse
operation, and while the slip compensation is valid (Pr.245).
• The slip amount adjustment is not available when the applicable motor capacity of the inverter is not compatible with the SF-
PR. (For details on applicable motor capacity, refer to
5.16.8 DC injection brake, zero speed control, and servo
• Adjust the braking torque and timing to stop the motor using the DC injection brake.
Zero speed control is also available under Real sensorless vector control, and zero speed control and servo lock are
selectable under Vector control or PM sensorless vector control.
When the DC injection brake operation is used, DC voltage is applied to the motor to prevent rotation of the motor shaft,
and when the zero speed control is used, Vector control is performed to keep 0 r/min. Either way, when a motor shaft is
rotated by external force, it does not go back to the original position.
When the servo lock control is used, the position of the motor shaft is held. 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.
10 DC injection brake
G100 operation frequency
11 DC injection brake
G101 operation time
12 DC injection brake
G110 operation voltage
802 Pre-excitation
G102 selection
1299 Second pre-
G108 excitation selection
850 Brake operation
G103 selection
*1 The initial value for the FR-A820-00490(7.5K) or lower and FR-A840-00250(7.5K) or lower.
*2 The initial value for the FR-A820-00630(11K) to FR-A820-03160(55K), FR-A840-00310(11K) to FR-A840-01800(55K).
*3 The initial value for the FR-A820-03800(75K) or higher and FR-A840-02160(75K) and higher.
 Setting of operating frequency (Pr.10)
• By setting the frequency to operate the DC injection brake (zero speed control / servo lock) to Pr.10 DC injection brake
operation frequency, the DC injection brake (zero speed control / servo lock) will operate when it reaches this frequency
at the time of deceleration.
• When Pr.10 = "9999", DC injection brake (zero speed control / servo lock) will start when the frequency reaches Pr.13
Starting frequency.
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lock
Name Initial value
3 Hz
0.5 s
*1
4%
*2
2%
*3
1%
0
0
0
search engine
page 826.)
Setting range
Set the operation frequency for the DC injection brake (zero speed
0 to 120 Hz
control / servo lock).
9999 The operation starts at the frequency set in Pr.13 or lower.
0 Without DC injection brake (zero speed control / servo lock)
Set the operation time for the DC injection brake (zero speed control
0.1 to 10 s
/ servo lock).
8888 The operation continues while the X13 signal is ON.
Set the DC injection brake voltage (torque). When set to "0", the DC
0 to 30%
injection brake is not applied.
0 Zero speed control
1 Servo lock
0 Zero speed control
1 Servo lock
0 DC injection brake operation
1 Zero speed control (Real sensorless vector control)
2 Magnetic flux decay output shutoff (Real sensorless vector control)
Description
The pre-excitation operation of the
second motor can be selected.
5. PARAMETERS
5.16 (G) Control parameters
1
2
3
4
5
6
7
8
9
10
715