0.0 to 60.0
Set the time during which DC injection
braking is applied when the RUN com-
mand is ON, when the DC injection
braking function is enabled.
*1. In high-frequency mode.
The braking power for DC injection braking can be set in the DC Injection Braking Power (A054). Note,
however, that setting this to exceed 10% automatically applies a limit to the carrier frequency.
The graph below shows the relationship between the DC injection braking power and the limit value for
the carrier frequency.
The value enclosed in parentheses ( ) on the graph represents the limit value for the carrier frequency.
When the value of Carrier Frequency (b083) is greater than the limit, the inverter operates at the carrier
frequency.
•
If the DC injection braking power is equal to or less than 10%, the maximum carrier frequency value
is limited to 15 Hz.
•
If the DC injection braking power is greater than 10% and equal to or less than 50%, the maximum
carrier frequency value is limited to 5 Hz.
•
If the DC injection braking power is greater than 50%, the maximum carrier frequency value is limited
to 2 Hz.
15
12
Limit
value for
carrier
9
frequency
(kHz)
7
5
3
2
0
10 20 30 40 50 60 70 80 90 100
Braking power (kHz)
Use this method to control DC injection braking according to the ON/OFF status of the external DC
injection braking signal allocated to the multi-function input terminal.
Allocate the Multi-function Input 1 to 7 Selection (C001 to C007) to 07 (DB: External DC injection
braking).
When the terminal DB turns ON, DC injection braking is applied independently of the RUN command
operation.
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