Siemens SINAMICS G150 Operating Instructions Manual page 559

Figure 9-18
Activation
The bypass without synchronization (p1260 = 3) can be triggered using the following signals
(p1267):
● Bypass using control signal (p1267.0 = 1):
The bypass is triggered using a digital signal (p1266) (e.g., from a higher-level
automation system). If the digital signal is canceled, a swichover to converter operations
is triggered once the debypass delay time (p1263) has expired.
● Bypass at a specific speed threshold (p1267.1 = 1):
Once a certain speed is reached, the system switches to bypass (i.e., the drive is used as
a starting drive). 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 (at 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.
The bypass time, debypass time, bypass speed variables and the command source for
switching over are set using parameters.
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Example circuit for bypass without synchronization
Functions, monitoring, and protective functions
9.3 Extended functions
559