Mitsubishi Electric 800 Series Instruction Manual page 333

• Under Real sensorless vector control, use Pr.640 Brake operation frequency selection to select whether the frequency
command or the actual motor speed (estimated value) is used as a reference for brake closing operation. If the brake
operation timing is different from the motor speed because of the load, set Pr.640 = "1 (brake operation with the actual
motor speed (estimated value))".
• Under Advanced magnetic flux vector control, the frequency command is used as a reference for brake operation
regardless of the Pr.640 setting.
NOTE
• Under torque control, the brake sequence function is disabled.
 Operation with brake opening completion signal input (Pr.292 = "7")
• When the start signal is input to the inverter, the inverter starts running, and when the output frequency reaches the
frequency set in Pr.278 Brake opening frequency and the output current or the motor torque is equal to or greater than
the Pr.279 Brake opening current setting, the brake opening request signal (BOF) is output after the time set in Pr.280
Brake opening current detection time. The Brake opening completion (BRI) signal is input, and the output frequency is
increased to the set speed after the set time in Pr.281 Brake operation time at start.
• When the inverter decelerates to the frequency set in Pr.282 Brake operation frequency during deceleration, the inverter
turns OFF the brake opening request signal (BOF) and decelerates further to the frequency set in Pr.278. After
electromagnetic brake operation completes and the inverter recognizes the turn OFF of the BRI signal, the inverter holds
the frequency set in Pr.278 for the time set in Pr.283 Brake operation time at stop. And after the time set in Pr.283
passes, the inverter decelerates again. The inverter outputs is shut off when the frequency reaches Pr.13 Starting
frequency setting or 0.5 Hz, whichever is lower.
 Operation without Brake opening completion (Pr.292 = "8") signal input
• When the start signal is input to the inverter, the inverter starts running, and when the output frequency reaches the
frequency set in Pr.278 Brake opening frequency and the output current or the motor torque is equal to or greater than
the Pr.279 Brake opening current setting, the brake opening request signal (BOF) is output after the time set in Pr.280
Brake opening current detection time.
After the BOF signal is output, the output frequency is increased to the set speed after the set time in Pr.281 Brake
operation time at start.
332
14.(A) Application Parameters
14.1 Brake sequence function
Output frequency(Hz)
Target frequency
Pr.282
Pr.278
Pr.13
STF
Output current or motor torque
(select by Pr.639)
Brake opening request
(BOF signal)
Brake opening completion
(BRI signal)
Closed
Electromagnetic brake
operation
Pr.280
Pr.281
ON
Pr.279
ON
ON
Opened
Pr.13 setting
or 0.5Hz,
whichever is lower
Time
Pr.283
Closed