Omron SYSDRIVE MX2 SERIES User Manual page 255

Internal DC Injection Braking (Operation Only Based on Set Frequency) (A051 = 02)
DC injection braking can be applied when the output frequency becomes lower than the setting
of Internal DC Injection Braking Frequency (A052).
Neither external nor 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 frequency reference and current frequency become
lower than A052. (Example 1-a)
When the reference frequency becomes 2 Hz higher than the A052 set value, DC injection
braking is released and the output returns to normal. (Example 1-a)
If the reference frequency is zero when the operation starts with analog input, operation is
started with DC injection breaking because both the reference and current frequencies are
zero.(Example 1-b)
If the RUN command is turned on with the determined frequency reference (a value larger than
the A052 setting is input), operation is started with normal output.
Example 1-a)
FW input
A052
Frequency
reference
Output
frequency
The operation to return to normal varies depending on the setting of DC Injection Braking
Edge/Level Selection (A056).
(a) Edge Operation (A056 = 00)
FW input
A052
Frequency
reference
Output
frequency
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
ON
ON
A053
5-10 Brake Settings
Example 1-b)
ON
FW input
A052
Frequency
reference
Output
frequency
(b) Level Operation (A056 = 01)
ON
FW input
A052
Frequency
reference
Output
frequency
5
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