4.3 Connection of the AC cabling
This is a Safety Class I product (supplied with a protective grounding
terminal). Uninterruptible protective grounding must be provided at
the AC input and/or output terminals and/or chassis grounding
point located externally on the product.
The MultiPlus is provided with a ground relay (relay H, see appendix B)
that automatically connects the Neutral output to the chassis if no
external AC supply is available. If an external AC supply is provided,
the ground relay H will open before the input safety relay closes. This
ensures the correct operation of an earth leakage circuit breaker that is
connected to the output.
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In a fixed installation, an uninterruptable grounding can be secured
by means of the grounding wire of the AC input. Otherwise the
casing must be grounded.
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In a mobile installation (for example, with a shore current plug),
interrupting the shore connection will simultaneously disconnect
the grounding connection. In that case, the casing must be
connected to the chassis (of the vehicle) or to the hull or grounding
plate (of the boat).
In case of a boat, direct connection to the shore ground is not
recommended because of potential galvanic corrosion. The solution to
this is using an isolation transformer.
The mains -input & output terminal connector can be found on the bottom of the
Multi Compact, see appendix A.
AC-in
The AC input must be protected by a fuse or magnetic circuit breaker rated
at 30 A or less, and cable cross-section must be sized accordingly. If the input
AC supply is rated at a lower value, the fuse or magnetic circuit breaker should be
down sized accordingly.
AC-out
With its PowerAssist feature the Multi can add up to 2 kVA (that is 2000 / 230 = 9
A) to the output during periods of peak power requirement. Together with a
maximum input current of 30 A this means that the output can supply up to
30 + 9 = 39 A.
An earth leakage circuit breaker and a fuse or circuit breaker rated to support
the expected load must be included in series with the output, and cable cross-
section must be sized accordingly. The maximum rating of the fuse or circuit
breaker is 40 A.
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