4-2 Function Mode Internal DC Injection Braking (A051 = 01) •Performs DC injection braking to stop the motor without any terminal operation. To use this function, set the DC injection braking selection (A051) to 01. •Set the DC injection braking power in A054. •Set the frequency for starting DC injection braking in A052. •If the DC injection braking delay time (A053) is set, the output is shut off when the frequency reaches the level set in A052 during deceleration, and free-run status arises for the specified period. DC injection braking starts after the set time elapses. •Below are edge/level operations in internal DC injection braking. Edge operation:
Giving priority to the DC injection braking time (A055), performs DC injection braking for the specified period. DC injection braking is activated 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 4-a), (Example 5-a) Level operation: Giving priority to the RUN command, shifts to normal operation, ignoring the DC injection braking time (A055). If the RUN command is turned on during DC injection braking, returns to normal operation, ignoring the set time in A055.
(Example 4-b), (Example 5-b) 4 Functions 4-17 (a) Edge operation (b) Level operation (Example 4-a) FW Free running Output frequency A053 A055 A052 (Example 4-b) FW Free running Output frequency A053 A055 A052 (Example 5-a) FW Output frequency A055 A052 (Example 5-b) FW Output frequency A055 A052 FW Free running Output frequency A053 A055 A052 A053 A055 FW Free running Output frequency A053 A055 A052 A053 A055 A055