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7 Detailed Functions
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
7-3 Basic Functions (Group A)
7
The carrier frequency for DC injection braking can be set in the DC Injection Braking Carrier Frequency
(A059). Note, however, that setting a 5 kHz or higher frequency automatically reduces the upper limit of
the braking power. Refer to the following figure.
• DC injection braking can be applied without terminal operation during startup/stop of the inverter.
To enable the DC injection braking function, set the DC Injection Braking Selection (A051) to 01.
• Set the DC injection braking power during startup in the Startup DC Injection Braking Power (A057)
and, regardless of the edge/level operation selection, the DC injection braking time during start up in
the Startup DC Injection Braking Time (A058). (Example 4-a, 4-b.)
• In the DC Injection Braking Power (A054), set the DC injection braking power other than during
startup.
• In the DC Injection Braking Frequency (A052), set the frequency at which you want to start DC
injection braking.
• When the DC Injection Braking Delay Time (A053) is set, turning OFF the RUN command (FW)
causes the inverter to shut off its output when the frequency reaches the value set in A052 and
remain in a free-run state during the time set in A053. After the expiration of the time set in A053, the
inverter starts DC injection braking.
• DC injection braking works differently between edge and level operations, when the RUN command
is switched from STOP to RUN.
Edge operation:
The inverter performs DC injection braking for the time set in the DC Injection Braking Time (A055),
which is given priority. Once the RUN command (FW) turns OFF, the inverter applies DC injection
braking for the time set in A055 when the output frequency reaches the value set in A052. Even if the
RUN command is turned ON while DC injection braking is active, the inverter continues to apply DC
injection braking during the time set in A055. (Example 5-a, 6-a)
Level operation:
The inverter ignores the DC Injection Braking Time (A055) setting and shifts to normal operation by the
RUN command that is priority given. If the RUN command is turned ON while DC injection braking is
active, the inverter returns to normal operation with the time set in A055 ignored. (Example 5-b, 6-b)
A059
DC Injection
Braking Carrier
Frequency
Heavy load (CT)
0.5 to 15.0 (0.4 to 55 kW)
5.0
kHz
0.5 to 10.0 (75 to 132 kW)
3.0
Light load (VT)
0.5 to 12.0 (0.4 to 55 kW)
3.0
0.5 to 8.0 (75 to 132 kW)
3.0
DC Injection Braking Carrier Frequency
DC Injection Braking Power Limit (55 kW max.) DC Injection Braking Power Limit (75 to 132 kW)
DC Injection Braking (A051 = 01)
Parameter No. Function name Data
Default data
Unit
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