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Standard operation functions (Pr. 10 to Pr. 16)
3.4 Standard operation functions (Pr. 10 to Pr. 16)
3.4.1 DC injection brake operation (Pr. 10, Pr.11 , Pr. 12,
Pr.802 )
<Setting>
• Use Pr. 10 to set the speed at which the DC injection brake application is started.
By setting "9999", the brake is operated at or below the speed set in Pr. 13.
• When stopping the motor by using a STOP key or turning the STF/STR off, the DC injection brake application is
started at the speed set in Pr.10. When stopping the motor by setting speed to 0r/min (with PU or Volume), the
DC injection brake application is started at the speed set in Pr.13.
• Use Pr. 11 to set the duration period the brake is applied. During this period, DC injection brake operation is
exercised.
When this period has elapsed, the motor is coasted to a stop.
• Use Pr. 12 to set the percentage to the power supply voltage. (Use this parameter only during V/F control.)
When using the inverter dedicated motor (Mitsubishi constant-torque motor SF-JRCA and Mitsubishi energy
saving motor SF-HR, SF-HRCA), change the Pr. 12 setting as follows:
•SF-JRCA: 3.7K or less ... 4%, 5.5K or more ... 2%
•SF-HR, SF-HRCA: 3.7K or less ... 4%, 5.5K, 7.5K ... 3%, 11K or more ... 2%
Select either 0 speed control or servo lock control for brake operation when pre-excitation is performed with the LX
signal using Pr.802.
Turning on the LX signal enables the pre-excitation operation. (valid only during speed control)
By setting the DC injection brake voltage (torque) at a stop, operation time and operation starting speed, the
stopping accuracy of positioning operation, etc. or the timing of applying the DC injection brake to stop the
braking torque and the motor is adjusted.
Parameter Name Factory Setting
Setting
Range
Remarks
10
DC injection brake
operation speed
15r/min
0 to 1500
r/min, 9999
9999: Operated at or below
Pr. 13 value.
Extended
mode
11
DC injection brake
operation time
0.5s 0 to 0.5s
12
DC injection brake
voltage
4%/2%
(7.5K or less/11K or more)
0 to 30% Use during V/F control.
802
Pre-excitation
selection
0 0, 1 Use during speed control.
REMARKS
• For the 5.5K and 7.5K, the Pr. 12 setting is automatically changed to 2% if Pr. 71 "applied motor" value is set to the
Mitsubishi constant torque motor. To the contrary, the Pr. 12 setting is changed to 4% if the Pr. 71 value is set to the general
purpose motor.
Parameter Name Description
802
Pre-excitation
selection
0: 0 speed control (factory setting)
Even under load, an attempt is made to maintain 0r/min to keep the motor shaft stopped.
Note that if the shaft is overcome and turned by external force, it does not return to the
original position.
Position control is not exercised and only speed control is carried out to perform operation.
1: Servo lock
Even under load, an attempt is made to maintain the motor shaft position. Note that if the
shaft is turned by external force, it returns to the original position after the external force has
gone away.
Since position control is exercised, you can adjust this position loop gain using Pr. 422
"position loop gain".
speed torque
speed position