18
Start-up
To make a delta connection, the bridges are placed in the electric motor box connecting: U with Z, V with X, W with Y. The
wires from the electric panel to the motor junction box connect the terminals: U to U, V to V, W to W, (see fig. No. 14-a).
To make the star connection connect together the three terminals: X-Y-Z of the junction box and connect the terminals U-V-
W with the corresponding terminals U-V-W on the electric panel. The power supply terminals R - S - T must be connected
to the power supply busbars or terminals on the electric panel (fig. No. 14-b).
Figure 14 a Figure 14 b Figure 14 c
Motors with 6 wires can be started using a Star/Delta splitter only if the supply line voltage is equal to the minimum voltage
shown on the nameplate, between the two values specified by the manufacturer. To make the star-delta connection, in the
motor box, all jumpers are removed, leaving the terminals free. The 6 wires from the board to the motor connect the 6
terminals of the board to the 6 terminals of the motor junction box as follows: U to U, V to V, W to W, Z to Z, X to X, Y to Y.
(see fig. No. 14-c).
Designation of the Power Cables of
the Three-Phase Lines By Different
Manufacturers
R = L
1
S = L
2
T = L
3
Designation of Cables and Terminals of
Three-Phase Electric Motor Coils by
Different Manufacturers
X
Y
Z
4
5
6
U
2
V
2
W
2
=
=
=
=
=
=
U
1
V
1
W
1
=
=
=
U
V
W
1
2
3
=
=
=
Start-up
6.8.1 Instructions for the Connection of Three Phase Electric Motors
Electrical
Panel
Electrical
Panel
Electrical
Panel
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