Mitsubishi FR-A800

(A) Application parameters
PARAMETERS
475
5
GROUP
A
Setting the brake sequence operation
• Select Real sensorless vector control, vector control (speed control), or Advanced magnetic flux vector control.
•Set Pr.292 = "7 or 8 (braking sequence operation)".
To ensure sequence operation, it is recommended to use with Pr.292 = "7" (with brake opening completion signal input).
• Set "15" in any of Pr.178 to Pr.189 (input terminal function selection), and assign the brake opening completion signal
(BRI) to the input terminal.
• Set "20" (positive logic) or "120" (negative logic) in any of Pr.190 to Pr.196 (output terminal function selection), and
assign the brake opening request signal (BOF) to the output terminal.
• Use Pr.639 Brake opening current selection to select whether the output current or the motor torque is used as a reference
for the brake opening operation.
• Under Real sensorless vector control, vector control, or PM 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, perform brake operation while referring to the frequency command
regardless of the Pr.640 setting.
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 signal (BRI) 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 BOF signal 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.
STF
ON
Output current or motor torque
(select by Pr.639)
Brake opening request
(BOF signal)
ON
Electromagnetic brake
operation
Opened
Closed Closed
Time
Brake opening completion
(BRI signal)
ON
Pr.278
Pr.282
Target frequency
Pr.13
Pr.280
Pr.281
Output frequency(Hz)
Pr.283
Pr.279
Pr.13 setting
or 0.5Hz,
whichever is lower