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Motor Brake And Stop Operation; Dc Injection Brake Of General-purpose Motor Control (pr. 10 To Pr. 12)
Air-conditioning inverter.
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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
4.10.1 DC injection brake of general-purpose motor control (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
12
DC injection brake
V/F
V/F
V/F
operation voltage
GP
GP
GP
MFVC
MFVC
MFVC
The above parameters can be set when Pr. 160 Extended function display selection ="0". (Refer to page 197)
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:
3.7K or lower...4%, 5.5K or higher...2%
SF-HR, SF-HRCA:
3.7K or lower...4%, 5.5K and 7.5K...3%, 11K and 15K...2%
REMARKS
 For the 5.5K and 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, 23, 40, 43, 120) to the value selecting the constant-torque motor (1, 13, 50, 53).
(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, 50, 53) to the value selecting the standard motor (0, 3, 23, 40, 43, 120).
 Even if the value of Pr. 12 setting is increased, braking torque is limited so that the output current is within the rated inverter
current.
DC Injection brake of general-
purpose motor control
DC injection brake of IPM
motor control
Selection of a
regenerative brake
Selection of motor
stopping method
Initial Value
3Hz
0.5s
0.4K to 7.5K
11K, 15K
(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. 10, Pr. 11
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.
4%
DC injection brake voltage (torque). When "0" is
0 to 30%
set, DC injection brake is disabled.
2%
Refer to Page
129
130
131
133
GP
GP
GP
V/F
V/F
V/F
MFVC
MFVC
MFVC
< V / F > < G P M F V C >
Description
129
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   Also See for Mitsubishi Electric FR-F700PJ

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