Dc Injection Brake And Zero Speed Control - Mitsubishi Electric 800 Series Instruction Manual

15.6

DC injection brake and zero speed control

• Adjust the braking torque and timing to stop the motor using the DC injection brake.
The zero speed control is available under Real 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.
Pr.
10 DC injection brake
G100 operation frequency
11 DC injection brake
G101 operation time
12 DC injection brake
G110 operation voltage
850 Brake operation
G103 selection
*1 The initial value differs depending on the inverter capacity.
FR-E820-0015(0.2K) or lower
FR-E820S-0015(0.2K) or lower
FR-E820-0030(0.4K) or higher
FR-E840-0016(0.4K) or higher
FR-E820S-0030(0.4K) 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) to Pr.10 DC injection brake operation
frequency, DC injection brake operation (zero speed control) starts when the frequency reaches the Pr.10 setting during
deceleration.
• The DC injection brake operation frequency depends on the stopping method.
Motor
Press the STOP/RESET key on
the operation panel.
Induction
Turn OFF the STF/STR signal.
motor
Set frequency to 0 Hz
Press the STOP/RESET key on
the operation panel.
PM motor
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 sensorless vector control.
392
15.(G) Control Parameters
15.6 DC injection brake and zero speed control
Name Initial value
3 Hz
0.5 s
6% / 4% /
*1
1%
0
Inverter
Stopping method
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
—
Pr.11 ≠ "0"
Pr.11 = "0"
—
DC injection
brake
voltage
Setting range
Set the operation frequency for the DC injection brake (zero speed
0 to 120 Hz
control).
0 DC injection brake operation (zero speed control) is not applied.
Set the operation time for the DC injection brake (zero speed
0.1 to 10 s
control).
Set the DC injection brake voltage (torque). When set to "0", the DC
0% to 30%
injection brake is not applied.
0 DC injection brake operation is applied.
1 Zero speed control (Real sensorless vector control)
Initial value
6%
4%
1%
Parameter setting
Pr. 10 Operation
frequency
Time
Pr.12
Operation
voltage
Time
Pr. 11 Operation time
Description
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
0 Hz
Motor coasts at the frequency set in
Pr.10 or lower.
0 Hz