• DC injection braking is started for the period of DC Injection Braking Time (3004Hex-17Hex/
3009Hex-0CHex) from the time that both the frequency reference and the output frequency reach or
fall below the DC Injection Braking Start Frequency (3004Hex-15Hex/3009Hex-0AHex). However, if
the Stop Frequency (3004Hex-1AHex) is higher than the DC Injection Braking Start Frequency
(3004Hex-15Hex/3009Hex-0AHex), DC injection braking is started from the time the output frequen-
cy reaches the Stop Frequency (3004Hex-1AHex), and is performed for the period of DC Injection
Braking T
ime (3004Hex-17Hex/3009Hex-0CHex).
• If, during DC injection braking, the set frequency becomes higher than the DC Injection Braking Fre-
quency (3004Hex-15Hex/3009Hex-0AHex) + 2 Hz, the Starting Frequency (3004Hex-18Hex/
3009Hex-0DHex) or the maximum value set in the Stop Frequency (3004Hex-1AHex/
3009Hex-40Hex), the inverter cancels DC injection braking and returns to normal operation. DC in-
jection braking is also canceled when the RUN command is OFF.
Operation
Starting frequency
Bold solid line ... output frequency
Solid line ... frequency reference
DC injection braking current
DC Injection Braking Level
(3004Hex-16Hex/3009Hex-0BHex)
2Hz
Stop Frequency
on
off off
DC Injection Braking Start Frequency
(3004Hex-15Hex/3009Hex-0AHex)
Operation
Starting frequency
DC injection braking current
2Hz
Free run
Stop Frequency
on
off off
Bold solid line ... output frequency
Solid line ... frequency reference
DC Injection Braking Level
(3004Hex-16Hex/3009Hex-0BHex)
DC Injection Braking Start Frequency
(3004Hex-15Hex/3009Hex-0AHex)
• When “0: Edge operation” is selected for External DC Injection Braking Edge/Level Selection
(301FHex-10Hex), DC injection braking operates for the period set at the DC Injection Braking Time
(3004Hex-17Hex/3009Hex-0CHex) after the conditions to start DC injection braking are established.
Operation
DC injection braking current
DC Injection Braking Level
(3004Hex-16Hex/3009Hex-0BHex)
DC Injection Braking Time
(3004Hex-17Hex/3009Hex-0CHex)
on
off off
DC Injection Braking Start Frequency
(3004Hex-15Hex/3009Hex-0AHex)
2Hz
Bold solid line ... output frequency
Solid line ... frequency reference
8 Other Functions
8-59
M1 Series EtherCAT Type User’s Manual (I670)
8-5 DC Injection Braking Function
8
8-5-1 DC Injection Braking (DB)
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