Motor Brake And Stop Operation; Dc Injection Brake (Pr. 10 To Pr. 12) - Mitsubishi Electric FR-D720-008 Instruction Manual

4.9

Motor brake and stop operation

Purpose
Motor braking torque adjustment
Improve the motor braking torque with
an option
Coast the motor to a stop
4.9.1

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 Extended function display selection ="0". (Refer to page 160)
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-D720-165 or less, FR-D740-080 or less, FR-D720S-100 or less, FR-D710W-042 or less...4%
FR-D720-238 or more, FR-D740-120 or more...2%
SF-HR, SF-HRCA:
FR-D720-165 or less, FR-D740-080 or less, FR-D720S-100 or less, FR-D710W-042 or less...4%
FR-D720-238 or more, FR-D740-120 or more...3%
DC Injection brake
Selection of a
regenerative brake
Selection of motor
stopping method
Initial Value
3Hz
0.5s
FR-D720-008 and 014
FR-D720S-008 and 014
FR-D710W-008 and 014
FR-D720-025 to 318
FR-D740-012 to 160
FR-D720S-025 to 100
FR-D710W-025 and 042
(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.
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
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
0 to 30%
set, DC injection brake is disabled.
4%
Refer to Page
107
108
110
Description
107
4