Bypass Without Synchronizer (P1260 = 3) - Siemens SINAMICS G150 Operating Instructions Manual

Functions, monitoring, and protective functions
9.3 Extended functions
Parameterization
Once the synchronized bypass without overlap (p1260 = 2) function has been activated, the
following parameters must be set.
Table 9- 8
Parameters
r1261.0
r1261.1
p1266 =
p1269[0] =
p1269[1] =
p3800 = 1
p3802 = r1261.2
p3809 =
9.3.2.3

Bypass without synchronizer (p1260 = 3)

Description
When the motor is transferred to the line supply, contactor K1 is opened (after the drive
converter pulses have been inhibited); the system then waits for the motor de-excitation time
and then contactor K2 is closed so that the motor is directly connected to the line supply.
If the motor is connected to the supply in a non-synchronized manner, an equalizing current
flows when the motor is switched in, and this must be taken into account when designing the
protective equipment (see figure "Circuit for bypass without synchronization"). Consequently,
this bypass type is suitable only for low power drives.
When the motor is being transferred from the supply by the converter, initially contactor K2 is
opened and after the excitation time, contactor K1 is closed. The converter then captures the
rotating motor and the motor is operated on the converter.
This bypass type does not require a VSM10 Voltage Sensing Module.
Contactor K2 must be designed for switching under load.
Contactors K1 and K2 must be interlocked against closing at the same time.
The "flying restart" function must be activated (p1200 = 1).
558
Parameter settings for bypass function with synchronizer without degree of overlapping
Signal "Command switch motor - power unit"
Signal "Command switch motor - line supply"
Control signal setting
Signal source for contactor K1 feedback
Signal source for contactor K2 feedback
Synchronization is activated
Synchronization activation is triggered by the bypass function
Setting the phase setpoint for synchronizing the drive to the line supply
Description
Operating Instructions, 07/2016, A5E03347396A
Converter cabinet units