Forming Dc Link Capacitors - Siemens SINAMICS G115D Operating Instructions Manual

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 fulfilled:
• 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 is 300 mA.
• The motor cables are maximum 15 m (49 ft) and are shielded. Additional information
about motor cables:
4.6

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 4th digit of the serial number. You may find the
serial number easily on the service information label at the front of the Electronic Module.
SINAMICS G115D distributed drive
Operating Instructions, 12/2020, FW V4.7 SP13, A5E48681219B-002
Maximum permissible cable length (Page 63)
4.6 Forming DC link capacitors
Wiring
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