Efficient Networks S120 manual Bypass with synchronization, without overlap p1260 =

Vector control 4.20 Bypass

●Pulses are enabled. Since "Synchronize" is set before "Pulse enable", the converter interprets this as a command to retrieve a motor from the supply and to take it over.

●After the motor has been synchronized to the line frequency, line voltage and line phase, the synchronizing algorithm reports this status.

●The bypass mechanism evaluates this signal and closes contactor K1. The signal is internally evaluated - BICO wiring is not required.

●Once contactor K1 has reported "closed" status, contactor K2 is opened and the motor is operated again on the converter.

4.20.2Bypass with synchronization, without overlap (p1260 = 2)

Description

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). 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.

Sufficiently large moment of inertia is a precondition for sound functioning.

It is no longer necessary to use the de-coupling reactor after having determined the synchronizing setpoint (p3809).

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Figure 4-27 Circuit example, bypass with synchronization without overlap

Activating

The bypass function with synchronization without overlap (p1260 = 2) can only be activated using a control signal. It cannot be activated using a speed threshold or a fault.

Drive Functions	163
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4