Bypass With Synchronization Without Overlap - Siemens Sinamics S120 Function Manual

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Vector control

● Pulses are enabled. Since "Synchronize" is set before "Pulse enable", the converter

● After the motor has been synchronized to the line frequency, line voltage and line phase,

● 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 is

Bypass with synchronization without overlap

When "bypass with synchronization without overlap (p1260 = 2)" is activated, contactor K2 to

be closed is only closed when contactor K1 has opened (anticipatory type synchronization).

During this time, the motor is not connected to the line supply so that its speed is determined

by the load and the friction. 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 is done by setting the synchronization setpoint (p3809). As a result of the

motor braking in the short time during which, both contactors are open, when closing

contactor K2, a phase and frequency difference of approximately zero is obtained.

For the function to run correctly, the moment of inertia of the drive and the load must be

A sufficiently high moment of inertia

is characterized by a change in the motor speed when opening contactors K1 and K2 that is

approximately equal to the rated slip and no more. The electrical angle difference of the

motor relative to the phase difference of the line supply may only change to the extent that it

can be compensated using p3809.

It is no longer necessary to use the de-coupling reactor after having determined the

synchronizing setpoint (p3809).

interprets this as a command to retrieve a motor from the supply and to take it over.

the synchronizing algorithm reports this status.

internally evaluated - BICO wiring is not required.

operated again on the converter.

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

Drive functions

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