Siemens SINAMICS DCM Betriebsanleitung Seite 590

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11.7 Monitoring functions
current in the converter. This can result in fuses blowing or under certain circumstances can
destroy the semiconductors.
The software of the SINAMICS DCM DC Converter identifies if inverter commutation faults
are pending and then issues the command to turn off the power semiconductors in the
converter to the SIMOREG CCP. SIMOREG CCP then turns off the power semiconductors,
ensures that the conditions to reduce the current in the motor are present and absorbs the
magnetic energy stored in the motor as electric energy.
Benefits:
This eliminates the complex and time consuming replacement of fuses after inverter
commutation faults. Although inverter commutation faults cannot be prevented, their effects
can be.
● Gearboxes and the driven machine are protected by shutting off the current in time before
it reaches its possible maximum value in the case of a fault therefore protecting them
against inadmissibly high torque surges.
● For high rated system currents, up until now, high-speed DC circuit-breakers were used
up until now to protect the fuses against rupture. By using the CCP, protection is now
cost-effectively possible even for lower line currents, whereby SIMOREG CCP has the
following advantages when compared to high-speed DC circuit-breakers even at high
current levels:
– Protection also for circulating currents
– Lower system costs
– Lower space requirements
– No additional air reactor to reduce the current rate-of-rise when a fault occurs
– Lower operating costs, as it requires no maintenance
– High degree of availability
Additional information for commissioning and the function of the SIMOREG CCP can be
taken from the operating instructions and Catalog D 23.1.
Connection
See the operating instructions for the CCP
Commissioning
See the operating instructions for the CCP
Parameter assignment
p50790 = [6]
CCP-relevant parameters:
r51560...p51583
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Operating Instructions, 04/2015, A5E36161239/RS-AA/001
SINAMICS DCM Cabinet