Motor Brake And Stop Operation; Dc Injection Brake (Pr. 10 To Pr. 12) - Mitsubishi Electric FR-E720-600 Instruction Manual

4.10 Motor brake and stop operation

Purpose
Motor braking torque adjustment
Improve the motor braking torque with
an option
Coast the motor to a stop
Used to stop the motor with a
mechanical brake
(vibration restraint at stop-on-contact)
Used to stop the motor with a
mechanical brake (operation timing of a
mechanical brake)

4.10.1 DC injection brake (Pr. 10 to Pr. 12)

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
Name
Number
DC injection brake
10
operation frequency
DC injection brake
11
operation time
DC injection brake
12
operation voltage
The above parameters can be set when Pr. 160 User group read selection ="0". (Refer to page 180)
Pr. 12
DC injection
Operation
brake voltage
voltage
Pr. 11
(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:
SF-JRCA:
FR-E720-175 or less, FR-E740-095 or less...4%
FR-E720-240 or more, FR-E740-120 or more...2%
SF-HR, SF-HRCA:
FR-E720-175 or less, FR-E740-095 or less...4%
FR-E720-240 and 330, FR-E740-120 and 170...3%
FR-E720-470 or more...2%
DC Injection brake
Selection of a
regenerative brake
Selection of motor
stopping method
Stop-on-contact control
Brake sequence function
Initial Value
3Hz
0.5s
FR-E720-008 and 015
FR-E720-030 to 330
FR-E740-016 to 170
FR-E720-470 and 600
(1) Operation frequency setting (Pr. 10)
After the frequency at which the DC injection brake will be operated is
set to Pr. 10, the DC voltage is applied to the motor when this frequency
is reached during deceleration.
Pr. 10
(2) Operation time setting (Pr. 11)
Operation frequency
Time 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.
Time
When Pr. 11 = "0s", the DC injection brake is disabled. (At a stop, the
Operation time
motor coasts.)

Motor brake and stop operation

Parameter that should be Set
Pr. 10 to Pr. 12
Pr. 30, Pr. 70
Pr. 250
Pr. 6, Pr. 48, Pr. 270, Pr. 275,
Pr. 276
Pr. 278 to Pr. 283, Pr. 292
Setting
Range
0 to
Operation frequency of the DC injection brake.
120Hz
0 DC injection brake disabled
0.1 to 10s Operation time of the DC injection brake.
6%
DC injection brake voltage (torque). When "0" is
4% 0 to 30%
set, DC injection brake is disabled.
2%
Refer to Page
121
122
124
125
127
Description
121
4