Siemens SIRIUS 3RW55 - Breakaway Pulse for Startup Functions

Functions
7.2 Start-up
SIRIUS 3RW55 soft starter
94 Manual, 08/2018, A5E35630887002A/RS-AB/002
7.2.9
Breakaway pulse for startup functions
Operating principle
It may be necessary to create a breakaway pulse at the beginning of the machine's starting
process. Using the breakaway pulse, the high limiting friction of the load can be overcome
and the machine can be set into motion. The breakaway pulse is used in conjunction with the
start type of the voltage ramp, the torque control, or the current limiting and overlays this
during the set breakaway time.
Application
● Mills
● Crushers
● Drives with journal bearings
Diagram
①
Voltage ramp
②
Parameterizable breakaway voltage
t
1
Breakaway time
t
1
... t
2
Ramp-up time
U
rated
Line voltage
U
S
Parameterizable starting voltage