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Explanation of functions (parameters)
2
FUNCTIONS
2.3.7 DC injection brake (Pr. 10 , Pr. 11 , Pr. 12 )
* The factory setting varies according to the inverter capacity. (7.5K or less/11K or more)
<Setting>
•Use Pr. 10 to set the frequency at which the DC injection brake operation is started.
•Use Pr. 11 to set the period during when the brake is operated.
•Use Pr. 12 to set the percentage of the power supply voltage.
•When using an inverter dedicated motor (constant-torque motor), set the following
value. (If the Pr. 71 value is changed to the setting for use with a constant-torque
motor without changing the Pr. 12 value from the factory setting, the Pr. 12 setting is
automatically changed to the following.)
.
Braking torque and timing to stop
the motor can be adjusted with
settings of DC injection brake
voltage (torque) at a stop,
operation time, and frequency at
an operation start.
Parameter Name
Factory
Setting
Setting
Range
Remarks
10
DC injection brake
operation frequency
3Hz 0 to 120Hz
Setting is enabled when
Pr. 30 = "1".
(When Pr. 11 is set to "0s" or
Pr. 12 is set to "0%", DC
injection brake is not
operated.)
11
DC injection brake
operation time
0.5s 0 to 10s
12 DC injection brake voltage 4%/2%(*) 0 to 15%
CAUTION
•A too large setting of Pr.12 "DC injection brake voltage" activates protection
function of electronic thermal relay function and can cause the inverter life to
be shorter.
Inverter Capacity Factory Setting Constant-torque Motor Setting
0.4K to 3.7K 4% 4% (no change)
5.5K, 7.5K 4% 2%
11K, 15K 2% 2% (no change)
CAUTION
Install a mechanical brake. No holding torque is provided.
♦Related parameters♦
• Pr. 71 "applied motor" ⇒ refer to page 80
Output frequency (Hz)
Time
Time
DC injection
brake voltage
"Operation
frequency"
Pr.10
Pr.12
"Operation
voltage"
Pr.11 "Operation time"