Mitsubishi Electric FR-A700 Instruction Manual page 443

Parameter
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 (source logic)" or "120 (sink 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.
b
CAUTION:
In lift applications where an inadvertent lifting of the holding brake can lead to personal
injury or property damage, the BOF signal may be used for safety reasons only in
source logic, that is, setting "20".
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 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 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.
Electromagnetic brake
Fig. 6-111: Operation when parameter 292 = 7
FR-A700 EC
Output
frequency
Pr. 280
Pr. 282
Pr. 278
Pr. 13
STF
Output currrent
BOF signal
BRI signal
Closed
operation
Pr. 281
ON
Pr. 279
ON
ON
Opened
Motor brake and stop operation
Time
Pr. 283
Closed
I001571E
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