4-18
4-2 Function Mode
4
Functions
Internal DC Injection Braking (Operates Only at the Set Frequency: A051 = 02)
DC injection braking is enabled when the output frequency becomes lower than the DC injection
braking frequency (A052) during operation.
•Neither external (A051 = 00) nor internal (A051 = 01) DC injection braking is available while this
function is selected.
•Operates only when the RUN command is turned on.
•DC injection braking starts when both the reference and current frequencies become lower than
A052. (Example 6-a)
•When the reference frequency reaches 2 Hz or higher than the set value in A052, DC injection
braking is released and the output returns to normal. (Example 6-a)
•If the reference frequency is "0" when the operation starts with analog input, the initial operation is
DC injection braking because both the reference and current frequencies are "0". (Example 6-b)
•If the RUN command is turned on with the frequency reference established (or a value larger than
the A052 setting is input), the initial operation is normal output.
•The operation to return to normal varies depending on the setting of the DC injection braking
method selection (A056).
(Example 6-a) (Example 6-b)
ON
RUN
command
A052
Frequency
reference
Output
frequency
ON
RUN
command
A052
Frequency
reference
Output
frequency
(a) Edge operation (b) Level operation
ON
RUN
command
A052
Frequency
reference
Output
frequency
A053
ON
RUN
command
A052
Frequency
reference
Output
frequency
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