(G) Control parameters
PARAMETERS
607
5
GROUP
G
Setting of operation voltage (torque) (Pr.12)
• Pr.12 DC injection brake operation voltage will set the percent against the power supply voltage. (Not used at the time of
zero speed control or servo lock)
• DC injection brake will not operate with setting of
Pr.12 = "0%". (The motor will coast to stop.)
NOTE
• When the initial value is set in Pr.12, the setting corresponding to the motor is set according to the Pr.71 Applied motor
setting. (Refer to page 441)
However, when an energy saving motor (SF-HR or SF-HRCA) is used, change the Pr.12 setting as shown below.
• Even if the setting value of Pr.12 is made larger, braking torque will be limited so the output current will be within the rated
current of the inverter.
Braking operation selection at the time of Real sensorless vector control
(Pr.850 = "0, 1")
• The braking operation at the time of the Real sensorless vector control can be selected between the DC injection brake
(initial value) or the Zero speed control.
By setting Pr.850 Brake operation selection = "1", zero speed control will be performed under the frequency set in Pr.10
DC injection brake operation frequency
NOTE
• Under Real sensorless vector control, when the X13 signal turns ON while Pr.11 = "8888", the zero speed control is activated
regardless of the Pr.850 setting.
• When restarting from brake operation at the time of Real sensorless vector control, set Pr.850 = "1" (zero speed control). In
case of setting value "0" (DC injection brake), it may take approximately 2 s from the time the start up command is input until
it actually is output.
Inverter Pr.12 setting
FR-A820-00250(3.7K) or lower
FR-A840-00126(3.7K) or lower
4%
FR-A820-00340(5.5K), FR-A820-00490(7.5K)
FR-A840-00170(5.5K), FR-A840-00250(7.5K)
3%
FR-A820-00630(11K) to FR-A820-01250(22K), FR-A820-01870(37K) or higher
FR-A840-00310(11K) to FR-A840-00620(22K), FR-A840-00930(37K) or higher
2%
FR-A820-01540(30K)
FR-A840-00770(30K)
1.5%
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