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Preparations for use
4.1 Notes for system integrators
● In the event of external tripping of the circuit breaker, prevent the converter from shutting
● Many circuit breakers do not have a mechanically leading contact. You can implement the
Lack of intrinsic device protection for the circuit breaker
If the fuseless version of the converter is being used and the circuit breaker does not have any
additional intrinsic device protection, this can result in damage to the power unit.
Ensure that the circuit breaker has additional intrinsic device protection. The intrinsic device
protection must be switched off within 100 ms of a short-circuit current at the latest.
40
down with unattributable follow-up messages. Therefore, ensure that the converter is
definitively switched to current-free with a "leading contact". This must happen before the
main contacts of the circuit breaker open. A corresponding message is also generated by
the converter open-loop controller ("external tripping of circuit breaker").
contact in various ways:
– If you are using a digital over-current relay, you must use it to detect all shutdown
conditions of the circuit breaker internally and externally (e.g. Buchholz fault). You must
program two tripping contacts with equivalent functions. One tripping contact is wired to
the "leading contact" input of the converter. The second tripping contact is wired to the
undervoltage release of the circuit breaker.
– The voltage at the undervoltage coil is queried via an optocoupler. The output of the
optocoupler is wired to the "leading contact" input of the converter. We recommend using
a Phoenix ST-OE 3 optocoupler with 24 V short-circuit-proof DC voltage output. The
exact type will depend on the auxiliary voltage of the switchgear (input data of the
optocoupler).
SINAMICS SL150 6SL39616RC100AA02
Operating Instructions Rev.201910281458 EXAMPLE
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