If the earth fault loop impedance of the line supply at the infeed point is too high to ensure
that the overcurrent protective device disconnects within the stipulated time in the case of
insulation failure (ground fault, fault to frame), then you must use additional residual current
protective devices RCD, type B.
In order that an RCD does not unnecessarily trip as a result of operational leakage currents,
the following preconditions must be fullled:
• The neutral point of the line supply is grounded.
• A dedicated RCD is used for each converter.
• Use a universal current-sensitive residual current protective device (RCD, RCM, ELCB or
RCCB), type B, for example, Siemens SIQUENCE RCCB. Connect the RCCB in series with the
overcurrent protective devices.
• Rated residual current is300mA.
• The motor cables are maximum 15 m (49 ft) and are shielded. Additional information about
motor cables:
Maximum permissible cable length (Page65)
5.6 Forming DC link capacitors
Introduction
You have to reform the DC link capacitors if the converter/Electronic Module has been stored for
more than one year. Non-formed DC link capacitors can damage the converter in operation.
Precondition
The converter/Electronic Module has not yet been used, and according to the production date it
was made over a year ago.
The production date is coded in the 3rd and 4thdigit of the serial number. You may nd the
serial number easily on the service information label at the front of the Electronic Module.
Production year and month
• Example: Serial number S XAM002-002137 → Production date October 2020
Wiring
5.6Forming DC link capacitors
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 59
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