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4.2.7 DC injection brake (Pr. 10 to Pr. 12)
Pr. 10 "DC injection brake operation frequency"
Pr. 11 "DC injection brake operation time"
Pr. 12 "DC injection brake voltage"
By setting the DC injection brake voltage (torque) at a stop, operation time and operation starting frequency,
the stopping accuracy of positioning operation, etc. or the timing of operating the DC injection brake to stop
the motor is adjusted according to the load.
Parameter
Factory
Number
Setting
10
3Hz
11
0.5 s
7.5K or less
4%
12
11K or more
2%
<Setting>
• Use Pr. 10 to set the frequency at which the DC injection brake application is started.
By setting "9999" in Pr. 10, the motor is decelerated to the frequency set in Pr. 13 and braked.
• Use Pr. 11 to set the period during when the brake is operated. By setting "8888" in Pr. 11, the DC injection
brake is operated while the X13 signal is on.
• Use any of Pr. 180 to Pr. 186 to assign the terminal used to input the X13 signal.
• Use Pr. 12 to set the percentage of the power supply voltage.
• When using the inverter dedicated motor (constant-torque motor SF-JRCA), change the Pr. 12 setting as
follows: 3.7K or less...4%, 5.5K or more...2% (Note 1)
Note: 1. When the Pr. 12 setting is either of the following values for 5.5K and 7.5K, it is automatically
changed when the Pr. 71 setting is changed:
(1) When Pr. 12 setting is 4% (factory setting)
The Pr. 12 setting is changed to 2% automatically when the Pr. 71 setting is changed from
[general-purpose motor selection value (0, 2)] to [constant-torque motor selection value (1)].
(2) When Pr. 12 setting is 2%
The Pr. 12 setting is changed to 4% (factory setting) automatically when the Pr. 71 setting is
changed from [constant-torque motor selection value (1)] to [general-purpose motor selection
value (0, 2)].
2. When Pr. 11 = "0" or Pr. 12 = "0", DC injection brake operation cannot be performed.
Install a mechanical brake. No holding torque is provided.
Setting Range
Remarks
9999: Operated at
0 to 120Hz, 9999
or below Pr. 13
value.
8888: Operated
0 to 10 s, 8888
when X13 signal
switches on.
0 to 30%
CAUTION
Related parameters
Pr. 13 "starting frequency"
Pr. 71 "applied motor"
DC dynamic
brake voltage
74
PARAMETERS
Pr.10
Time
Pr.12
Operation
voltage
Time
Pr.11 Operation time
Operation
frequency
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