61EN
MASTERYS GP4 60-160 kVA - Ref.: IOMMASGPXX07-EN 05
11.10 External Maintenance Bypass
The external maintenance bypass is designed to provide maximum system availability for critical equipment. It offers
the possibility of transferring the load to an alternative power path allowing full isolation of the UPS. In this case the
UPS can be turned off and removed without power interruption at the connected loads.
For further information contact SOCOMEC.
11.11 External Isolation Transformer
If an external isolation transformer cabinet is required, the following instructions should be followed:
• Refer to the relevant installation manual.
• See section on Electrical Installation for details about protection.
• The protection cable marked with the ground symbol is connected directly to the distribution panel.
• The transformer can either be connected to the UPS input or output.
The UPS must not be operated without the neutral connection to the input.
The transformer cannot be connected to the output on individual UPS units connected in parallel
configuration.
For connection details refer to the transformer terminal board diagram.
11.11.1 IMD
IMD (Insulation Monitoring Device) is reccomended for IT systems.
11.12 Kit for Rectifi er Neutral creation
For three wire input mains (without neutral) a neutral kit is available as an option. The neutral kit does not change the
type of grounding system and it does not create galvanic insulation.
An input mains neutral bar is not available.
The input mains and auxiliary mains must be separate.
The auxiliary mains must always have a neutral wire.
The auxiliary mains neutral wire must be galvanically isolated from the PE.
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