SINAMICS S120 Functi.. - Gregbotos.com

Extended FunctionsBypass (vector)4.25.2 Bypass with synchronization, without overlap (p1260 = 2)When “bypass with synchronization without overlap (p1260 = 2)” is activated, contactorK2 to be closed is first closed when contactor K1 has opened (anticipatorytype synchronization). The motor voltage phase position before synchronizationmust be set so that a “lead” is obtained before the line supply to which the systemmust be synchronized; this is realized by setting the synchronizing setpoint(p3809). As a result of the motor braking in the short time during which, both contactorsare open, when closing contactor K2, a phase and frequency difference ofapproximately zero is obtained.It is no longer necessary to use the de-coupling reactor after having determinedthe synchronizing setpoint (p3809).Networkdsv. 3_ssapybConverterProtectivedeviceK1K2M ~Interlocked againstsimultaneously closingFig. 4-32Circuit example, bypass with synchronization without overlapActivationIt is only possible to activate the bypass function with synchronization without overlap(p1260 = 2) using a control signal (p1267.0 = 1, p1267.1 = 0, p1267.2 = 0); it isnot possible to activate this function using a speed threshold or a fault.4-282© Siemens AG 2006 All Rights ReservedSINAMICS S120 Function Manual, 03/2006 Edition