4-27
4-2 Function Mode
4
Functions
Internal DC Injection Braking (Operates Only at the Set Frequency) (A051: 02)
•DC injection braking can be applied when the output frequency becomes lower than the DC
injection braking frequency (A052).
•Neither (2) external nor (3) internal 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 7-a)
•When the reference frequency exceeds the A052 set value by 2 Hz or more, DC injection braking
is released and the output returns to normal. (Example 7-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 7-b)
(a) Edge operation (b) Level operation
(i) During startup (example 4-a) (ii) During startup (example 4-b)
(ii) During stop (example 5-a) (ii) During stop (example 5-b)
(iii) During stop (example 6-a) (iii) During stop (example 6-b)
FW
Output frequency
A057
A058
FW
Output frequency
A057
A058
FW
Output frequency
A052
A053
A055
Free running
FW
Output frequency
A052
A053
A055
Free running
FW
Output frequency
A052
A055
FW
Output frequency
A052
A055
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