Mitsubishi Electric FR-A700 Instruction Manual page 424

Motor brake and stop operation
Operation voltage (torque) setting (Pr. 12)
Use Pr. 12 to set the percentage to the power supply voltage. (This parameter is not used during
zero speed control or servo lock.)
When Pr. 12 = 0%, the DC injection brake is not operated. (At a stop, the motor coasts.)
When using the constant-torque motor (SF-JRCA) and energy saving motor (SF-HR,
SF-HRCA), change the Pr.12 setting as follows:
Constant-torque motor (SF-JRCA):
Energy saving motor SF-HR, SF-HRCA: 00126 or less ... 4 %
NOTE For the 00170 and 00250, when the Pr. 12 setting is as below, changing the Pr. 71 "Applied
motor" setting changes the Pr. 12 setting automatically, it is not necessary to change the
Pr. 12 setting.
Parameter 12 = 4% (initial value)
The Pr. 12 setting is automatically changed to 2% if the Pr. 71 value is changed to from the
value selecting the standard motor (0, 2 to 8, 20, 23, 24, 40, 43, 44) to the value selecting
the constant motor (1, 13 to 18, 50, 53, 54).
Parameter 12 = 2%
The Pr. 12 setting is automatically changed to 4% if the Pr. 71 value is changed from the
value selecting the constant motor (1, 13 to 18, 50, 53, 54) to the value selecting the
standard motor (0, 2 to 8, 20, 23, 24, 40, 43, 44).
Brake operation selection during real sensorless vector control (Pr. 850)
You can select DC injection brake (initial value) or zero speed control for brake operation during
real sensorless vector control.
When Pr. 850 = "1", zero speed control is exercised when the frequency reaches or decreases
below the frequency set in Pr. 10.
NOTES
When the X13 signal is on with Pr. 11 = "8888", zero speed control is activated regardless of
setting of Pr. 850 Brake operation selection.
When restarting from brake operation during real sensorless vector control, set "1" (zero
speed control) in Pr. 850. When the setting value is "0" (DC injection brake), it may take
approx. 2s until frequency is actually output from when the start command is input.
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00126 or less ... 4 %
00170 to 01800 ... 2 %
00170 and 00250 ... 3 %
00310 to 01800 ... 2 % (00770 ... 1,5 %)
Parameter