Functions, monitoring, and protective functions
9.3 Extended functions
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A
455
Bypass with synchronizer with degree of overlapping (p1260 = 1)
Description
The "Bypass with synchronization with degree of overlapping" is used for drives with a low
moment of inertia. These are drives for which their speed would sink very fast when the K1
contactor opens.
When "bypass with synchronization with overlap (p1260 = 1)" is activated, the motor is
transferred, synchronized to the line supply and is also retrieved again. During the
changeover, both contactors K1 and K2 are closed at the same time for a period (phase lock
synchronization).
This bypass type requires a VSM10 Voltage Sensing Module that measures the line voltage
for the drive to be synchronized.
An output reactor is used to de-couple the drive from the line supply - the impedance value
for the reactor is 10 (±2) %.
Figure 9-15 Typical circuit diagram for bypass with synchronizer with degree of overlapping
The synchronized bypass with overlap (p1260 = 1) function can only be activated using a
control signal. It cannot be activated using a speed threshold.
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