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ELECTRICAL CONNECTIONS (S3T)
WARNING: a 4-wire three-phase distribution system is required.
The UPS must be connected to a power supply source providing 3-phase + neutral + PE (protective earth) of a TT, TN
or IT type. The phase rotation must be correct.
In the IT system a 4-pole thermal-magnetic circuit breaker is mandatory.
Optional TRANSFORMER BOXES to convert the distribution systems from 3-wire to 4-wire are available upon request.
WIRING DIAGRAMS FOR CONNECTING TO THE ELECTRICAL SYSTEM
UPS without any variation in the neutral condition UPS w/o any variation in the neutral condition and a Dual Input option
UPS with galvanic isolation at the output UPS with galvanic isolation at the output and a Dual Input option
UPS with galvanic isolation at the input UPS with galvanic isolation and a Dual Input option
* LVS: low voltage source
Table 10
Dual Input:
If the Dual Input option is present and the bypass is supplied from a separate low voltage source, protective devices must be present
on both the main input supply and the bypass supply.
Note: the neutral of the input and the bypass supplies are connected together inside the equipment, therefore they must be referenced
to the same potential. If the two power supplies are different, an isolation transformer has to be used on either of the two inputs.
UPS with galvanic isolation
UPS with galvanic isolation at the input UPS with galvanic isolation at the Bypass input
* LVS1: low voltage source 1; LVS2: low voltage source 2;
Table 11
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