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Connecting the AC cabling to your MultiPlus-II 230V involves several safety considerations to ensure proper operation and to prevent hazards.
Safety Classification:
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Your MultiPlus-II 230V is a safety class I product, which means it must have an uninterruptible grounding point. This is crucial for safety purposes.
Ground Relay Operation:
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The product includes a ground relay (relay H) that automatically connects the Neutral output to the chassis when no external AC supply is available.
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When an external AC supply is provided, this relay will open before the input safety relay closes, ensuring earth leakage circuit breakers function correctly.
Fixed Installation Grounding:
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In a fixed installation, the uninterruptible grounding can be assured via the grounding wire of the AC input cable.
Mobile Installation Grounding:
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In mobile installations, such as with a shore power connection, the grounding will disconnect when the shore connection does.
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In these cases, ensure the casing is connected to the chassis (of the vehicle) or to the hull or grounding plate (of the boat).
Preventing Galvanic Corrosion:
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Specifically for boats, avoid direct connection to the shore ground due to the risk of galvanic corrosion. Use an isolation transformer to mitigate this risk.
Torque Specifications: When securing connections, apply the correct torque to the bolts:
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M4 bolts: 1 Nm
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M5 bolts: 3 Nm
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M6 bolts: 5.5 Nm
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M8 bolts: 12 Nm
Limit on Aggregation:
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The unit has fixed trip limits and should not be aggregated above 30kW on a single point of common connection.
Locating AC Terminal Blocks:
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The AC terminal blocks are located on the printed circuit board within the unit. Refer to Appendix A for the exact location and connection overview.
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