Siemens SINAMICS G130 Operating Instructions Manual page 457

● Since the bit is set while the converter is running, the "Transfer motor to line supply"
synchronization process is started.
● Once motor synchronization to line frequency, line voltage and line phasing is complete,
the synchronization algorithm reports this state (r3819.2).
● The bypass mechanism evaluates this signal and closes contactor K2 (r1261.1 = 1). The
signal is evaluated internally - BICO wiring is not required.
● After contactor K2 has fed back the "closed" state (r1269[1] = 1), contactor K1 is opened
and the converter inhibits the pulses. The converter is in "Ready for operation and
bypass" state.
● If the On command is cancelled in this phase, the converter will change to "Ready to start
and bypass" state. If the appropriate contactors are being used, the converter will be
isolated from the line supply and the DC link discharged.
To transfer the motor back from the line supply, the sequence is simply reversed: At the start
of the process, contactor K2 is closed and contactor K1 is open.
● The "Command bypass" control bit is canceled (e.g. by the higher-level automation).
● The bypass function sets the control word bit "synchronizing".
● The pulses are enabled. Since "synchronizing" is set before "pulse enable", the converter
interprets this as a command to retrieve the motor from the line supply.
● Once converter synchronization to line frequency, line voltage and line phasing is
complete, the synchronization algorithm reports this state.
● The bypass mechanism evaluates this signal and closes contactor K1. The signal is
evaluated internally - BICO wiring is not required.
● Once contactor K1 has reported "closed" state, contactor K2 is opened and the motor
returns to operation on the converter.
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A
Functions, monitoring, and protective functions
9.3 Extended functions
457