Three-phase wiring diagrams
For simple and cost-effective wiring, only two solid state contactors can often be used in a
three-phase configuration (if the three-phase load is connected in 3 wires: star without neutral
or closed delta).
An example of a wiring diagram of the two fan-cooled units on a 380 V supply between
phases is given in figure 5.2 (supply of fan code
43,
bi-voltage 350-450 V and 200-260 V).
Ph 1
f
Ph 2 p h 3
Installation protection
and cut-ott
d e m o
Logic
control signal
t
I
• 1 : Z Z )
0 5 A
fuses
451
series
Fan-cooled
unit
5
10
.11MM.M11,
451
series
Fan-cooled
unit
or A t h r e e - p h a s e load
(3 wires)
Figure 5.2 Example of 451 three-phase wiring diagram in two phase control
Fan-cooled units.
380 V supply between phases.
Load in star without neutral or in closed delta.
Reminder:
for the PLF option, the 451 PLF detection circuit is powered by terminal 8,
common to the fan power supply.
451-461 User Manual
5-3
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