4-2 Function Mode Edge operation: Giving priority to DC injection braking time A055, performs DC injection braking for the set time in A055. DC injection braking operates for the set time in A055 when the output frequency reaches the set value in A052 after the RUN command (FW) is turned off. Even if the RUN command is turned on during DC injection braking, the latter is effective during the set time in A055. (Example 5-a), (Example 6-a) Level operation: Giving priority to the RUN command, shifts to normal operation, ignoring DC injec- tion braking time A055. When the RUN command is turned on during DC injection braking, returns to normal operation, ignoring the set time in A055.
(Example 5-b), (Example 6-b) 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) 4-27 (a) Edge operation (b) Level operation (i) During startup (example 4-a) FW Output frequency A057 A058 (ii) During startup (example 4-b) FW Output frequency A057 A058 (ii) During stop (example 5-a) FW Free running Output frequency A053 A055 A052 (ii) During stop (example 5-b) FW Free running Output frequency A053 A055 A052 (iii) During stop (example 6-a) FW Output frequency A055 A052 (iii) During stop (example 6-b) FW Output frequency A055 A052 FW Output frequency A057 A058 A058 FW Output frequency A057 A058 A058 FW Free running Output frequency A053 A055 A052 A053 A055 FW Free running Output frequency A053 A055 A052 A053 A055