Motor Brake And Stop Operation; Dc Injection Brake (Pr. 10 To Pr. 12) - Mitsubishi Electric FR-F720-0.75K to 110K Instruction Manual

Motor brake and stop operation

4.9 Motor brake and stop operation

Purpose
Motor braking torque adjustment
Improve the motor braking torque with an
option
Performing operation by DC current input DC current feeding mode
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 when a motor decelerates to stop.
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 175)
Pr.12
DC injection
Operation
brake
voltage
voltage
Pr. 11 Operation time
(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 less ...4%, 5.5K to 55K...2%
SF-HR, SF-HRCA: 3.7K or less...4%, 5.5K and 7.5K...3%, 11K to 55K...2% (30K...1.5%)
REMARKS
⋅ For the 5.5K and 7.5K, when the Pr. 12 setting is as below, changing the Pr. 71 Applied motor setting changes the Pr. 12 setting
automatically, it is not necessary to change the Pr. 12 setting.
(a) When Pr. 12 is 4% (initial value)
The Pr. 12 setting is automatically changed to 2% if the Pr. 71 value is changed from the value selecting the standard motor
(0, 2) to the value selecting the constant motor (1).
(b) When Pr. 12 is 2%
The Pr. 12 setting is automatically changed to 4% if the Pr. 71 value is changed from the value selecting the constant motor
(1) to the value selecting the standard motor (0, 2).
⋅ Even if the Pr. 12 setting is increased, braking torque is limited so that the output current is within the rated inverter current.
As stop holding torque is not produced, install a mechanical brake.
♦ Parameters referred to ♦
Pr. 13 Starting frequency
Pr. 71 Applied motor Refer to page 105
106
DC injection brake
Selection of a regenerative brake
Selection of motor stopping method
Output stop function
Initial Value
3Hz
0.5s
7.5K or less
11K to 55K
75K or more
(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.
⋅ At the Pr. 10 setting of "9999", the DC injection brake is operated when
deceleration is made to the frequency set in Pr. 13 Starting frequency.
(2) Operation time setting (Pr. 11)
Time
⋅ In Pr. 11, set the time of the DC injection brake.
⋅ When Pr. 11 = "0s", the DC injection brake is disabled. (At a stop, the
motor coasts.)
Time
⋅ When the motor does not stop due to large load moment (J), increasing
the setting produces an effect.
Refer to page 98
Parameter that must be set
Setting
Range
Set the operation frequency of the DC injection
0 to 120Hz
brake.
9999 Operated at Pr. 13 or less.
0 DC injection brake disabled
0.1 to 10s Set the operation time of the DC injection brake.
4%
Set the DC injection brake voltage (torque). When
2% 0 to 30%
"0" is set, DC injection brake is disabled.
1%
CAUTION
Refer to Page
Pr. 10 to Pr. 12
Pr. 30, Pr. 70
Pr. 30
Pr. 250
Pr. 522
Description
106
107
107
112
113