4-2 Function Mode 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. 4 (Example 6-a) (Example 6-b) Functions •The operation to return to normal varies depending on the setting of the DC injection braking method selection (A056).
4-18 RUN command A052 Frequency reference Output frequency ON RUN command A052 Frequency reference Output frequency ON (a) Edge operation (b) Level operation ON RUN command A052 Frequency reference Output frequency A053 ON RUN command A052 Frequency reference Output frequency ON RUN command A052 Frequency reference Output frequency A053 ON A053 RUN command A052 Frequency reference Output frequency ON