Omron 3G3MX2 User Manual page 255

Internal DC Injection Braking (A051 = 01)
DC injection braking can be applied without terminal operation at start/stop of the Inverter.
To use internal DC injection braking, set Internal DC Injection Braking Selection (A051) to "01:
Enabled."
Set the Startup DC Injection Braking Power using A057, and set the startup DC Injection
Braking Time using A058 regardless of the edge or level operation. (Examples 1-a, 1-b)
Set DC Injection Braking Power (A054) to define the braking power other than at startup.
Use Internal DC Injection Braking Frequency (A052) to set the frequency at which to start DC
injection braking.
Once DC Injection Braking Delay Time (A053) is set, the Inverter stops output when the
frequency reaches the A052 value after the RUN command (FW) has been turned off. During
the set time in A053, the motor remains in free-run status. After an elapse of the period set in
A053, DC injection braking starts.
Edge and Level operations for internal DC injection braking work differently when the RUN
command switches from STOP to RUN.
Edge operation: Giving priority to DC Injection Braking Time (A055), performs DC injection
Level operation: Giving priority to the RUN command, shifts to normal operation, ignoring the
(a) Edge Operation (A056 = 00)
Example 1-a) When starting
FW input
Output frequency
Example 2-a) When stopping
FW input
Output frequency
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)
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 when the RUN command is turned ON, DC injection braking continues
to be applied during the period set in A055. (Examples 2-a, 3-a)
DC Injection Braking Time (A055).
When the RUN command is turned ON during DC injection braking, the
period set in A055 is ignored and the Inverter returns to normal operation.
(Examples 2-a, 3-b)
A057
A058
Free run
A053
A055
A052
5-10 Brake Settings
(b) Level Operation (A056 = 01)
Example 1-b) When starting
FW input
Output frequency
A057
A058
Example 2-b) When stopping
FW input
Free run
Output frequency
A053
A052
5
A055
5-138