Bypass With Synchronization With Overlap - Siemens Sinamics S120 Function Manual

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● When the drive is started up again after POWER ON, the status of the bypass contactors

● Changing the converter into "Ready to start and bypass" status after powering up, is of a

● Monitoring of the motor temperatures using temperature sensors is active while the

● The two motor contactors must be designed for switching under load.

Prerequisite

The bypass function is only possible for encoderless closed-loop speed control (p1300 = 20)

or V/f control (p1300 = 0...19) and when an induction motor is used.

Commissioning the bypass function

The bypass function is part of the function module "technology controller" that can be

activated when using the commissioning Wizard. Parameter r0108.16 indicates whether it

has been activated.

Bypass with synchronization with overlap

When "bypass with synchronization with overlap (p1260 = 1)" is activated, then motor is

transferred, synchronized to the line supply and is also retrieved again. During the

changeover, the two contactors K1 and K2 are simultaneously closed for a time (phase lock

synchronization).

A reactor is used to de-couple the drive converter from the line supply - the uk value for the

reactor is 10% +/- 2%.

Drive functions

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

is evaluated. After powering up, the converter can thereby change straight into "Ready to

start and bypass" status. This is only possible if the bypass is activated via a control

signal, the control signal (p1266) is still present once the system has been ramped up,

and the automatic restart function (p1200 = 4) is active.

higher priority than switching back on automatically.

converter is in one of two statuses "Ready to start and bypass" or "Ready for operation

and bypass".

The examples contained in the following descriptions are only basic circuits designed to

explain the basic function. The dimensions of specific circuit configurations (contactors,

protective equipment) must be calculated for specific systems.

Vector control

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