10.7.11 Replacing Cell Input Power Fuses
A label is located on the power cell chassis and cover that shows all approved replacements. Only
two phases of each transformer secondary (power cell input) are fused.
Blown Cell Input Power Fuse Indicator
Each fuse has visual blown indication, making it easy to diagnose a fuse’s condition. Fuses are
forced air cooled for longer life and less thermal stress.
The fuses, located on the front panel, are mounted external to the cell. This not only reduces the
size of the cell, but also allows for the fuses to be located in an accessible location. They primarily
provide secondary short circuit protection and are sized to accommodate power cell charging
currents upon initial energizing.
Note
Matching Fuses
A mixture of fuse vendors is permitted, but not within the same power cell.
Note
Recommended Time Limit for Fuse Replacement
As a preventive maintenance measure for drives that experience daily inrush events, Siemens
recommends replacing all power fuses that have been in operation for ten years.
Note
Primary and E-Rated Fuses
The core drive does not include primary fuses. When E-rated fuses are required, contact Siemens
Engineering.
Cell Input Power Fuse Replacement Procedure
To replace an open cell input fuse:
1. Power down the SINAMICS GH180 Perfect Harmony™ System, obeying all standard electrical
and safety instructions. Prior to opening the doors of the VFD, be sure to read the chapter
titled "VFD Power Down and Door Access" located in this manual.
2. Open the doors / panels to access the Cell Input Fuse section.
Note
This section varies based on the drive output voltage and cell size. The customer specic
documentation shall be referenced to locate the Cell Input Fuse.
Maintenance
10.7 Remove and Replace
Type 6SR5 Air-Cooled
96 Operating Instructions, AK, A5E39390112
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