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Dc Injection Brake - Mitsubishi Electric FR-F820-00046 Instruction Manual

Fr-f800 series.
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• 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 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 the details of applicable motor capacity, refer to

5.13.8 DC injection brake

• Adjust the braking torque and timing to stop the motor using the DC injection brake.
By the DC injection brake operation, DC voltage is applied to the motor to prevent rotation of the motor shaft. When a motor
shaft is rotated by external force, the motor shaft does not go back to the original position.
Pr.
Name
10
DC injection brake
G100
operation frequency
11
DC injection brake
G101
operation time
12
DC injection brake
G110
operation voltage
*1
The initial value for the FR-F820-00340(7.5K) or lower and FR-F840-00170(7.5K) or lower.
*2
Initial value for the FR-F820-00490(11K) to FR-F820-02330(55K), and the FR-F840-00250(11K) to FR-F840-01160(55K).
*3
Initial value for the FR-F820-03160(75K) or higher and FR-F840-01800(75K) or higher.
 Setting of operating frequency (Pr.10)
• By setting the frequency to operate the DC injection brake to Pr.10 DC injection brake operation frequency, the DC
injection brake will operate when it reaches this frequency at the time of deceleration.
• When Pr.10 = "9999", DC injection brake will start when the frequency reaches Pr.13 Starting frequency.
• The DC injection brake operation frequency depends on the stopping method.
Stopping method
Press the STOP key on the operation panel.
Turn OFF the STF/STR signal.
Set frequency to 0 Hz
• The DC injection brake operation frequency will be fixed to 0 Hz under PM motor control.
 Setting of operation time (X13 signal, Pr.11)
• Set the operation time for the DC injection brake in Pr.11 DC injection brake operation time.
Initial value
Setting range
0 to 120 Hz
3 Hz
9999
0
0.5 s
0.1 to 10 s
8888
*1
4%
*2
0 to 30%
2%
*3
1%
Parameter setting
0.5 Hz or higher in Pr.10
Lower than 0.5 Hz in Pr.10, and 0.5 Hz or
higher in Pr.13
Lower than 0.5 Hz in both Pr.10 and Pr.13
DC injection
Pr.12
Operation
brake
voltage
voltage
Pr. 11 Operation time
page
612.)
Description
Set the operation frequency for the DC injection brake.
The operation starts at the frequency set in Pr.13 or lower.
Without DC injection brake.
Set the operation time for the DC injection brake.
The operation continues while the X13 signal is ON.
Set the DC injection brake voltage (torque). When set to "0", the DC
injection brake is not applied.
DC injection brake operation frequency
Pr.10 setting
0.5 Hz
Pr.10 or Pr.13 setting, whichever larger
Pr.13 setting or 0.5 Hz, whichever smaller
Pr. 10 Operation
frequency
Time
Time
535
5. PARAMETERS
5.13 (G) Control parameters
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