Mitsubishi Electric FR-A700 Instruction Manual page 225

(1) Set the brake sequence mode
⋅ Select either real sensorless vector control, vector control (speed control) or advanced magnetic flux vector control.
The brake sequence function is valid only when the external operation mode, external/PU combined operation mode
1 or network operation mode is selected.
⋅ Set "7 or 8" (brake sequence mode) in Pr. 292 .
To ensure more complete sequence control, it is recommended to set "7" (brake opening completion signal input) in
Pr. 292 .
⋅ 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.
Output frequency(Hz)
Target frequency
Pr.282
Pr.278
Pr.13
STF
Output I
Brake opening request
(BOF signal)
Brake opening completion
(BRI signal)
Closed
Electromagnetic brake
operation
Output frequency
(Hz)
Target frequency
Pr.280
Pr.282
Pr.278
Pr.13
STF
Output
I
Brake opening request
(BOF signal)
Closed
Electromagnetic brake
operation
REMARKS
⋅ Even if brake sequence mode has been selected, inputting the jog signal (jog operation), RT signal (second function selection)
or X9 signal (third function selection) during an inverter stop will switch to the normal operation and give priority to jog operation
or second and third function selection. Note that JOG and RT signal input is invalid even if JOG signal and RT signal are input
during automatic acceleration/deceleration operation.
Pr.280
Pr.281
ON
Pr.279
ON
ON
Opened
Pr.281
ON
Pr.279
ON
Opened
Motor brake and stop operation
(2) With brake opening completion signal
input (Pr. 292 = "7")
⋅ When the start signal is input to the inverter,
the inverter starts running. When the internal
speed command reaches the value set in Pr.
278 and the output current is not less than the
Time
Pr.283
value set in Pr. 279 , the inverter outputs the
brake opening request signal (BOF) after the
time set in Pr. 280 has elapsed.
When the time set in Pr. 281 elapses after the
brake opening completion signal (BRI) was
activated, the inverter increases the output
Closed
frequency to the set speed.
⋅ When the speed has decreased to the
frequency set in Pr. 282 during deceleration, the
BOF signal is turned off. When the time set in
Pr. 283 elapses after the electromagnetic brake
operation was completed and the BRI signal
was turned off, the inverter output is switched
off.
(3) Without brake opening completion
signal input (Pr. 292 = "8")
⋅ When the start signal is input to the inverter,
the inverter starts running. When the internal
speed command reaches the value set in Pr.
278 and the output current is not less than the
Time
Pr.283
value set in Pr. 279 , the inverter outputs the
brake opening request signal (BOF) after the
time set in Pr. 280 has elapsed.
When the time set in Pr. 281 elapses after the
BOF signal is output, the inverter increases
Closed
the output frequency to the set speed.
⋅ When the speed has decreased to the
frequency set in Pr. 282 during deceleration,
the brake opening request signal (BOF) is
turned off. When the time set in Pr. 283 has
elapsed after the BOF signal is turned off, the
inverter output is switched off.
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