Three-phase wiring diagrams
5.3 "MASTER-SLAVE" CONFIGURATION
If it is necessary for the firing modes independent of the units to be synchronized, a power
unit is used with the analogue control signal ("Master") to control the power on 1 phase and
drive one or two solid state contactors ("Slave") which controls the power on one phase
("Two phase control") or on two phases ("Three phase control").
The 455 and 461 series are used as a Master (analogue control signal); the 451 series (logic
input) is used as a Slave.
Three phase control
Phi P h 2 P h i N
P ?
Installation
protection and cut-off
device
Analogue
control signal
f
0 5 A
fuses
455
or 461
series
Master
13
J
451 series
Slave
451 series
Slave
Terminal 8 of the 451 series only for
the PLF option
(PLF circuit power supply)
Th se-phase load
Star
with
neutral
(4 wires)
Figure 5.5 Example of wiring diagram in three phase control (Master - Slaves)
380 V voltage between phases.
Configuration in star with neutral on resistive loads with low temperature coefficient.
451-461 User Manual
5-7
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