Mitsubishi Electric F700 User Manual

98
Motor brake and stop operation
4.9 Motor brake and stop operation
4.9.1 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 156)
(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 not operated. (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%)
Purpose Parameter that must be set Refer to Page
Motor braking torque adjustment DC injection brake Pr. 10 to Pr. 12 98
Improve the motor braking torque
with an option
Selection of a regenerative brake Pr. 30, Pr. 70 99
Coast the motor to a stop Selection of motor stopping method Pr. 250 100
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
Number
Name Initial Value Setting Range Description
10
DC injection brake
operation frequency
3Hz
0 to 120Hz
Set the operation frequency of the
DC injection brake.
9999 Operated at Pr. 13 or less.
11
DC injection brake
operation time
0.5s
0 DC injection brake disabled
0.1 to 10s
Set the operation time of the DC
injection brake.
12
DC injection brake
operation voltage
7.5K or less 4%
0 to 30%
Set the DC injection brake voltage
(torque). When "0" is set, DC injection
brake is disabled.
11K to 55K 2%
75K or more 1%
(1) Operation frequency setting (Pr. 10)
⋅ When the frequency at which the DC injection brake operates is set in
Pr. 10, the DC injection brake is operated when this frequency is reached
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)
⋅ Use Pr. 11 to set the duration period the DC injection brake is applied.
⋅ When Pr. 11 = "0s", the DC injection brake is not operated. (At a stop, the
motor coasts.)
⋅ When the motor does not stop due to large load moment (J), increasing
the setting produces an effect.
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).
CAUTION
As stop holding torque is not produced, install a mechanical brake.
♦ Parameters referred to ♦
Pr. 13 Starting frequency Refer to page 93
Pr. 71 Applied motor Refer to page 97
Time
Pr. 10 Operation frequency
Time
Pr.12
Operation
voltage
voltage
Pr. 11 Operation time
Output frequency (Hz)
DC injection
brake

Mitsubishi Electric F700 Specifications

General

Brand	Mitsubishi Electric
Model	F700
Category	Inverter
Language	English