Mitsubishi Electric 800 Series Instruction Manual page 461

(A) Application parameters
Operation without brake opening completion signal input (Pr.292 = "8")
• 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.
• When the inverter decelerates to the frequency set to 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 the turn
OFF of BOF 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 set time in Pr.283 passes, the inverter decelerates again. Pr.13 Starting frequency setting or 0.5 Hz,
whichever is lower
Output frequency(Hz)
Output current or motor torque
Brake opening request
Electromagnetic brake
NOTE
• Even if the brake sequence operation has been selected, inputting the JOG signal (JOG operation) will change the operation
method to normal operation and give a priority to the JOG operation. Note that the JOG signal input by the brake sequence
function is invalid during operation.
Set multiple brake sequence functions (Pr.641)
• When the second brake sequence function is set, it is possible to switch between and use two types of brake sequence
functions. Turning ON the RT signal enables the second brake sequence function.
• Select the operation of the second brake sequence function with Pr.641 Second brake sequence operation selection.
Pr.641
Brake sequence function when the RT signal is ON
setting
0 (initial value) Normal operation (The first and second brake sequence functions invalid)
7 Second brake sequence mode 1
8 Second brake sequence mode 2
9999 First brake sequence mode is valid
• Set "45" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the Second brake sequence open
completion signal (BRI2) to the input terminal.
• To use the Second brake opening request signal (BOF2), set "22 (positive logic)" or "122 (negative logic)" in any of Pr.190
to Pr.196 (Output terminal function selection) to assign the function to the output terminal.
• The method of setting the second brake sequence parameters is the same as that for the corresponding first brake
sequence function parameters.
• Switchover of the brake sequence function by RT signal is valid when the inverter is stopped.
460
PARAMETERS
Target frequency
Pr.280
Pr.282
Pr.278
Pr.13
STF
(select by Pr.639)
(BOF signal)
Closed
operation
Pr.281
ON
Pr.279
ON
Opened
Pr.13 setting
or 0.5Hz,
whichever is lower
Time
Pr.283
Closed