Siemens SINAMICS G220 - Page 595

• DC braking when a starting speed is fallen below
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① If the binary signal sink c1230 has a 1 signal and the motor speed falls below the starting speed,
then the converter switches o󹪜 the motor current for the duration of the motor de-excitation
time p0347. The drive behaves in the same way as it does in response to an OFF2 command.
② After the motor de-excitation time, the converter brakes the motor using DC braking.
③ The motor resumes normal operation after the DC braking time.
• DC braking when a fault occurs
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① After a fault, which is assigned the DC braking response, the converter brakes the motor along
the OFF1 down ramp.
② As soon as the motor speed falls below the speed to start DC braking, the converter switches o󹪜
the motor current for the duration of the motor de-excitation time p0347. The drive behaves in
the same way as it does in response to an OFF2 command.
③ After the motor de-excitation time, the converter brakes the motor using DC braking.
④ The converter exits DC braking after the DC braking time.
Parameters
The following list contains the parameters of the "DC braking" function.
Number Name Unit
p0347[0...n] Motor de-excitation time [s]
c1230[0...n] DC braking/armature short circuit activation 
Functions
14.11Drive functions
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 593