Bypass - Siemens SINAMICS G120 Operating Instructions Manual

6.36

Bypass

Function
The "Bypass" function switches the motor between inverter and line operation. The "Bypass"
function is supported only for induction motors.
Figure 6-62
Requirements placed on the K1 inverter contactor and K2 line contactor:
● K1 and K2 are designed for switching under load.
● K2 is designed for switching an inductive load.
● K1 and K2 are interlocked against closing at the same time.
Switching between inverter operation and line operation
Switching from inverter operation to line operation
1. The inverter switches the motor OFF.
2. The inverter opens the K1 inverter contactor via a digital output.
3. The inverter waits for the unlocking time of the motor.
4. The inverter waits for the feedback that the K1 inverter contactor is open.
5. The inverter closes the K2 line contactor via a digital output.
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Bypass with control via the inverter
Advanced commissioning
6.36 Bypass
351