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ELECTRICAL CONNECTIONS (S3M)
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
NOTE: within the following diagrams, the symbol denotes a three-phase connection and the symbol denotes a single-phase connection.
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 21
Dual Input:
If the Dual Input option is present and the bypass is fed by a separate low voltage source, protective devices must be present on both
the main input line and the bypass line.
Note: the neutral of the input line and that of the bypass are commoned inside the equipment, so they must refer to the same potential.
If the two power supplies are different, an isolation transformer has to be used on either of the 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 22
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