Mitsubishi Electric 800 Series Instruction Manual page 384

 Operation time setting (Pr.11)
• Set the operation time for the DC injection brake (zero speed control) in Pr.11 DC injection brake operation time.
• When the motor does not stop due to large load moment (J), increase the setting to ensure the effect.
• When Pr.11 = "0", the DC injection brake (zero speed control) does not operate. (The motor starts to coast when the output
frequency drops to the Pr.10 setting or lower at a stop.)
 Setting of operation voltage (torque) (Pr.12)
• Set the percentage against the power supply voltage in Pr.12 DC injection brake operation voltage. (The setting is not
used for zero speed control.)
• The DC injection brake operation is not available when the setting of Pr.12 is 0%. (The motor starts to coast when the
output frequency drops to the Pr.10 setting or lower at a stop.)
• The Pr.12 setting is disabled under PM sensorless vector control.
NOTE
• When the setting of Pr.12 is the initial value, the setting corresponding to the motor is set according to the Pr.71 Applied motor
setting. (Refer to
as shown below.
Motor capacity
3.7 kW or lower
5.5 kW or higher
• Even if the setting value of Pr.12 is made larger, braking torque will be limited so the output current will be within the rated
current of the inverter.
 Braking operation selection under Real sensorless vector control
(Pr.850)
• The braking operation under Real sensorless vector control can be selected between the DC injection brake operation
(initial setting) and zero speed control.
By setting Pr.850 Brake operation selection = "1", zero speed control will be performed at the frequency set in Pr.10 DC
injection brake operation frequency or lower.
Control method
V/F control
Advanced magnetic flux vector control
Real sensorless vector control
PM sensorless vector control
NOTE
• When restarting the operation after a brake operation under Real sensorless vector control, set Pr.850 = "1" (zero speed
control). Setting "0" (DC injection brake) may cause a delay of about 2 seconds from the time the start up command is input
until it actually is output.
CAUTION
• Install a mechanical brake to make an emergency stop or to stay stopped for a long time.
Parameters referred to
Pr.13 Starting frequencypage 169,
Pr.71 Applied motorpage 294
Pr.80 Motor capacitypage 299
Pr.178 to Pr.189 (Input terminal function
page 297.) However, when an energy saving motor (SF-HR or SF-HRCA) is used, change the Pr.12 setting
4%
3%
Control
Pr.850
mode
— —
— —
0
Speed
1
0
Torque
1
Speed —
page 170
selection)page 283
Pr.12 setting
Deceleration stop
DC injection brake
DC injection brake
DC injection braking
Zero speed
DC injection braking
Zero speed
DC injection brake
15.6 DC injection brake and zero speed control
383
15. (G) Control Parameters
11
12
13
14
15
16
17
18
19
20