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PARAMETERS
5
Motor brake and stop operation
5.10 Motor brake and stop operation
5.10.1 DC injection brake (Pr. 10 to Pr. 12)
The above parameters can be set when Pr. 160 User group read selection ="0". (Refer to page 167)
(3) Operation voltage (torque) setting (Pr. 12)
Use Pr. 12 to set the percentage to the power supply voltage.
When Pr. 12 = "0%", the DC injection brake is disabled. (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:
Purpose Parameter that should be Set Refer to Page
Motor braking torque adjustment DC Injection brake Pr. 10 to Pr. 12
135
Improve the motor braking torque with
an option
Selection of a
regenerative brake
Pr. 30, Pr. 70
136
Coast the motor to a stop
Selection of motor
stopping method
Pr. 250
138
Used to stop the motor with a
mechanical brake
(vibration restraint at stop-on-contact)
Stop-on-contact control
Pr. 6, Pr. 48, Pr. 270, Pr. 275,
Pr. 276
139
The DC injection brake can be operated at a motor stop to adjust the stop timing and braking torque.
In DC injection brake operation, DC voltage is directly applied to the motor to prevent the motor shaft from rotating. The
motor will not return to the original position if the motor shaft rotates due to external force.
Parameter
Number
Name Initial Value
Setting
Range
Description
10
DC injection brake
operation frequency
3Hz
0 to
120Hz
Operation frequency of the DC injection
brake.
11
DC injection brake
operation time
0.5s
0 DC injection brake disabled
0.1 to
10s
Operation time of the DC injection brake.
12
DC injection brake
operation voltage
0.1K, 0.2K 6%
0 to
30%
DC injection brake voltage (torque). When
"0" is set, DC injection brake is disabled.
0.4K to 7.5K 4%
11K, 15K 2%
(1) Operation frequency setting (Pr. 10)
When the frequency at which the DC injection brake will be operated is
set to Pr. 10, the DC voltage is applied to the motor upon reaching to
the set frequency during deceleration.
(2) Operation time setting (Pr. 11)
In Pr. 11, set the time of the DC injection brake.
When the motor does not stop due to large load moment (J), increasing
the setting produces an effect.
When Pr. 11 = "0s", the DC injection brake is disabled. (At a stop, the
motor coasts.)
Motor Pr.12 DC injection brake operation voltage Setting
SF-JRCA
3.7K or lower 4%
5.5K or higher 2%
SF-HR, SF-HRCA
3.7K or lower 4%
5.5K, 7.5K 3%
11K, 15K 2%
REMARKS
For the 5.5K, 7.5K, when the Pr. 12 setting is the following, changing the Pr. 71 Applied motor setting automatically changes the
Pr. 12 setting. Therefore, it is not necessary to change the Pr. 12 setting.
(a) When 4% (initial value) is set in Pr. 12
The Pr. 12 setting is automatically changed to 2% if the Pr. 71 value is changed from the value selecting the standard motor
(0, 3 to 6, 23, 24, 40, 43, 44) to the value selecting the constant-torque motor (1, 13 to 16, 50, 53, 54).
(b) When 2% is set in Pr. 12
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 16, 50, 53, 54) to the value selecting the standard motor (0, 3 to 6, 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.
Operation frequency
Time
Pr. 10
Time
Operation
voltage
Pr. 12
DC injection
brake voltage
Operation time
Pr. 11
(Hz)Output frequency