Mitsubishi Electric 800 Series Instruction Manual (Function page 477

17.6
DC injection brake, zero speed control, servo lock,
and magnetic flux decay output shutoff
• 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.
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
850 Brake operation
G103 selection
422
Position control gain 10 s
B003
*1 The initial value differs depending on the inverter capacity as follows.
FR-E820-0015(0.2K) or lower
FR-E820S-0015(0.2K) or lower
FR-E820-0030(0.4K) to FR-E820-0330(7.5K)
FR-E840-0016(0.4K) to FR-E840-0170(7.5K)
FR-E820S-0030(0.4K) or higher
FR-E820-0470(11K) or higher
FR-E840-0230(11K) or higher
FR-E860-0017(0.75K) or higher
 Setting of operating frequency (Pr.10)
• By setting the frequency for DC injection brake operation (zero speed control / servo lock) to Pr.10 DC injection brake
operation frequency, DC injection brake operation (zero speed control / servo lock) starts when the frequency reaches
the Pr.10 setting during deceleration.
476
17. (G) Control Parameters
17.6 DC injection brake, zero speed control, servo lock, and magnetic flux decay output shutoff
Name Initial value
3 Hz
0.5 s
6% / 4% /
*1
2% / 1%
0
0
-1
Inverter
Setting range
Set the operation frequency for the DC injection brake (zero speed
0 to 120 Hz
control / servo lock).
DC injection brake operation (zero speed control / servo lock) is not
0
applied.
Set the operation time for the DC injection brake (zero speed
0.1 to 10 s
control / servo lock).
DC injection brake operation starts when the X13 signal is turned
8888
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 DC injection brake operation is applied.
1 Zero speed control (under Real sensorless vector control)
Magnetic flux decay output shutoff (under Real sensorless vector
2
control)
-1
Set the position control gain for servo lock.
0 to 150 s
Initial value
6%
4%
2%
1%
Description