94
Motor brake and stop operation
4.9 Motor brake and stop operation
4.9.1 DC injection brake and pre-excitation (Pr. 10, Pr. 11, Pr. 795)
The above parameters can be set when Pr. 160 Extended function display selection ="0". (Refer to page 144)
∗1 Differs according to capacities. (0.2K to 2.2K/3.7K)
∗2 If a value exceeding 3000r/min is set, the actual rotation speed will be limited at 3000r/min.
(1) Coasting speed setting (Pr. 10)
When the speed at which coasting starts is set in Pr. 10, output is shutoff when this speed is reached during deceleration
and motor starts coasting. (This function is valid when Pr. 11 = "0s")
When Pr. 11 ≠ "0", Pr. 10 is always set to 0r/min.
(2) Operation time setting (Pr. 11)
In Pr. 11, set the time of the DC injection brake.
When Pr. 11 = "0", 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.
(3) Setting the torque generated during DC injection brake operation (Pr. 795)
For Pr. 795, set the maximum generatable torque during DC injection brake.
A setting value larger than 50% may cause a motor overload trip (E.THM) in a certain DC injection brake time.
Purpose Parameter that should be Set Refer to Page
Motor braking torque adjustment
DC injection brake and
pre-excitation
Pr. 10, Pr. 11, Pr. 795
94
Improve the motor braking torque with
an option
Selection of a
regenerative brake
Pr. 30, Pr. 70
97
Coast the motor to a stop
Selection of motor
stopping method
Pr. 250
99
At a motor stop, DC injection brake operates to apply braking torque to the motor.
Parameter
Number
Name
Initial
Value
Setting Range Description
10 Coasting speed
90r/min
0 to 3600r/min/
0 to 2400r/min
∗1∗2
The speed where the motor starts coasting
11
DC injection brake operation
time
0.5s
0 DC injection brake disabled
0.1 to 10s Operation time of the DC injection brake.
795 DC brake torque boost
9999
0 to 150%
The maximum generatable torque during DC
injection brake
9999 50% setting
(r/min) (r/min)
Pr. 11 Operation time
DC injection brake
is exercised at 0r/min.
Rotation
speed
Rotation
speed
Time
Time
DC injection
brake
DC injection
brake
Operation example when DC injection
brake is exercised (Pr. 11 0)
Motor coasting
Time
Time
Operation example when DC injection
brake is not exercised (Pr. 11 = 0)
Pr. 10
Coasting speed time
