Siemens SINAMICS G150 Operating Instructions Manual page 489

Figure 9-15
Activation
The bypass with synchronizer (p1260 = 3) can be triggered by the following signals (p1267):
● Bypass by means of control signal (p1267.0 = 1):
● Bypass at speed threshold (p1267.1 = 1):
The bypass time, debypass time, bypass speed variables and the command source for
changing over are set using parameters.
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
Example circuit for bypass without synchronization
The bypass can be activated by means of a digital signal (p1266) (e.g. from a higher-level
automation system). If the digital signal is canceled, a changeover to converter
operations is triggered once the debypass delay time (p1263) has expired.
Once a certain speed is reached, the system switches to bypass (i.e. the converter is
used as a start-up converter). The bypass cannot be connected until the speed setpoint is
greater than the bypass speed threshold (p1265).
The system reverts to converter mode when the setpoint (on the input of the ramp-
function generator, r1119) falls below the bypass speed threshold (p1265). The setpoint >
comparison value condition prevents the bypass from being reactivated straight away if
the actual speed is still above the bypass speed threshold (p1265) after switching back to
converter operations.
Functions, Monitoring, and Protective Functions
K 1
M
~
9.3 Extended functions
K 2
487