Siemens SINAMICS S120 Manual page 478

Options
8.31 L34, output-side circuit breaker
Features
Option L34 is completely pre-wired. It is controlled using a built-in TM31 Terminal Module.
To control this, the parameterization specified in the following Chapter "Parameterization"
must be made during commissioning.
Note
After setting the parameters, the user must ensure that the switch is operating correctly.
For this reason, the output-side breaker is automatically controlled via the converter.
Note
The "ON" pushbutton directly located at the output switch is only available with the full
functional scope, if the following preconditions are fulfilled:
 there is no alarm or fault present,
 the customer remote-OFF is set to "enable".
To close the output-side breaker, the following conditions must be fulfilled:
● There must be no faults on the Motor Module.
● There must be no OFF command active on the Motor Module.
● The Motor Module must receive an ON command.
● Pre-charging of the Motor Module must be complete.
The output-side breaker is opened under the following conditions:
● There is an active fault on the Motor Module.
● The power supply at the auxiliary power system for option L34 (230 V AC/24 V DC) fails.
● The local "OFF" button on the output-side breaker is pressed.
Note
Pressing the "OFF" button directly on the output-side breaker will switch the Motor
Module off (pulse suppression). The converter displays "External fault 3". The breaker
can be closed again only by sending a new ON command via the Motor Module.
Note
To reduce the number of switching cycles, the output-side breaker will not open if the
Motor Module receives an "OFF" command (OFF1, OFF2, OFF3).
If they are available, remote off switches (for optional use by customers) for disconnecting
the output-side breaker must be connected accordingly via the undervoltage coil.
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Cabinet Modules
Manual, 03/2013, A5E03263538A