106
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 175)
(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%)
Purpose
Parameter that must be set
Refer to Page
Motor braking torque adjustment
DC injection brake
Pr. 10 to Pr. 12
Improve the motor braking torque with an
option
Selection of a regenerative brake
Pr. 30, Pr. 70
Performing operation by DC current input DC current feeding mode
Pr. 30
Coast the motor to a stop
Selection of motor stopping method
Pr. 250
Output stop function
Pr. 522
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 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)
⋅
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.)
⋅
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).
⋅
Even if the
Pr. 12
setting is increased, braking torque is limited so that the output current is within the rated inverter current.
CAUTION
As stop holding torque is not produced, install a mechanical brake.
♦
Parameters referred to
♦
Pr. 13 Starting frequency
Refer to page 98
Pr. 71 Applied motor
Refer to page 105
Time
Pr
. 10
Operation
frequency
Time
Pr.12
Operation
voltage
voltage
Pr. 11
Operation time
Output frequency (Hz)
DC injection
brake