Bypass With Synchronizer Without Degree Of Overlapping (P1260 = 2) - Siemens SINAMICS S150 Operating Instructions Manual

Functions, monitoring, and protective functions
9.4 Extended functions
● Once motor synchronization to line frequency, line voltage and line phasing is complete,
● The bypass mechanism evaluates this signal and closes contactor K2 (r1261.1 = 1). The
● After contactor K2 has fed back the "closed" state (r1269[1] = 1), contactor K1 is opened
● If the On command is cancelled in this phase, the converter will change to "Ready to start
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
● Once converter synchronization to line frequency, line voltage and line phasing is
● The bypass mechanism evaluates this signal and closes contactor K1. The signal is
● Once contactor K1 has reported "closed" status, contactor K2 is opened and the motor
9.4.2.2

Bypass with synchronizer without degree of overlapping (p1260 = 2)

Description
When "Bypass with synchronizer without degree of overlapping (p1260 = 2)" is activated,
contactor K2 (to be closed) is only closed when contactor K1 is opened (anticipatory type
synchronization). Phasing of the motor voltage before synchronization must be set such that
there is an "initial jump" upstream of the supply to which synchronization should be carried
out. This done by setting the synchronization setpoint (p3809). A phase and frequency
difference of around zero is produced when closing contactor K2 by braking the motor in the
brief period in which both contactors are open.
In order for the function to run correctly, the moment of inertia must be sufficient.
Due to the expense of determining the synchronization setpoint (p3809), the decoupling
restrictor is not needed.
The "flying restart" function must be activated (p1200 = 1).
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the synchronization algorithm reports this state (r3819.2).
signal is evaluated internally - BICO wiring is not required.
and the converter inhibits the pulses. The converter is in "Ready for operation and
bypass" state.
and bypass" status. If the appropriate contactors are being used, the converter will be
isolated from the line supply and the DC link discharged.
interprets this as a command to retrieve the motor from the line supply.
complete, the synchronization algorithm reports this state.
evaluated internally - BICO wiring is not required.
returns to operation on the converter.
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A