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Motor brake and stop operation
(3) 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.
SF-JRCA: FR-A720-00175 (FR-A740-00090) or less ...4%,
FR-A720-00240 to 02150 (FR-A740-00120 to 01100)...2%
SF-HR, SF-HRCA: FR-A720-00175 (FR-A740-00090) or less...4%,
FR-A720-00240 and 00330 (FR-A740-00120 and 00170)...3%,
FR-A720-00460 to 02150 (FR-A740-00230 to 01100)...2%
(FR-A720-01150 (FR-A740-00570)...1.5%)
REMARKS
For the FR-A720-00240, 00330 and FR-A740-00120, 00170, 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.
(a) When Pr. 12 is 4% (initial value)
The Pr. 12 setting is automatically changed to 2% if the Pr. 71 value is changed from the value selecting the standard motor
(0, 2 to 8, 20, 23, 24, 40, 43, 44) to the value selecting the constant torque motor (1, 13 to 18, 50, 53, 54).
(b) When Pr. 12 is 2%
The Pr. 12 setting is automatically changed to 4% (initial value) if the Pr. 71 value is changed from the value selecting the
constant torque 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).
Even if the Pr.12 setting is increased, braking torque is limited so that the output current is within the rated inverter current.
(4) Brake operation selection during Real sensorless vector control (Pr. 850 = "0, 1")
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.
REMARKS
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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