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The ground relay in your MultiPlus-II 230V plays an important role in the safety and correct functioning of your inverter, especially regarding earth leakage protection.
When the AC output’s backfeed safety relays are open (meaning there’s no AC input), the neutral conductor is automatically connected to the chassis via this ground relay.
This connection is crucial because it ensures that any earth leakage circuit breakers (which protect against electric shock) will operate correctly.
Now, if you’re setting up a split-phase system using a separate autotransformer, you may need to connect an external ground relay. This is because the internal ground relay of the MultiPlus-II alone might not provide complete grounding for the entire system in such configurations.
The external ground relay would ensure that all parts of your split-phase system are adequately grounded, maintaining safety throughout the system.
If you look at the MultiPlus-II 230V Connection Overview, the connections for the external ground relay are labeled ‘M’. You’ll find two terminals: one for the positive (External ground relay +) and one for the negative (External ground relay -).
Here’s how you can make the connections:
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Locate terminals ‘M3’ (External ground relay +) and ‘M4’ (External ground relay -) on the terminal block of your MultiPlus-II.
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Connect the positive line from your external ground relay to ‘M3’.
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Connect the negative line from your external ground relay to ‘M4’.
This setup is essential when you have a split-phase system because it keeps the neutral grounded regardless of the source of AC input. This ensures the system is safe to use and compliant with electrical codes, especially in scenarios where the inverter is connected to an autotransformer for split-phase operation.
It’s a smart design that maintains the safety integrity of your electrical system, particularly in case of a fault condition where the inverter needs to ensure proper tripping of protective devices.
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