Three-phase wiring diagrams
5.2 4 5 5 AND 461 SERIES POWER UNITS
The use of 3 power units (455 and 461 series) i n three-phase is only possible
for a load in a star with neutral or in an open delta.
Warning
• For correct unit operation, the power and power supply wiring
diagram, given in the figures which follow, must be
observed.
• I t is fundamental to supply the drive electronics with a voltage
in phase
with the load and thyristor supply voltage.
• In the case of a load with a
high temperature coefficient,
the current
in the
neutral
may be up to
1.7 times greater
than the currents in
the phases; the current in the phases is limited by the current
limit of each unit.
In the case of a 3 wire configuration (load in star without neutral or in closed delta, 3 phase
control is not possible with 455 and 461 series units.
In this case, use a 455 or 461 unit
("Master")
and 451 series solid state contactors
("Slaves"),
see next section.
5-4
451-461 User Manual
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