2 Engineering
2.9 Three-phase motors
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
46
2.9.2 Circuit types with three-phase motors
Based on the mains voltage (U
LN
= output voltage U
2
) and the rated data on
the motor’s nameplate (rating plate), the stator winding of a three-phase
motor can be configured as a star or delta circuit.
Figure 27: Example of a contactor rating plate
for a three-phase asynchronous motor
Figure 28: Circuit types:
Star-connected circuit (left), Delta circuit (right)
Examples based on figure 27 and figure 28
Motor with star-connected circuit,
Mains voltage: 3~ 400 V; Output voltage: 3 ~ 400 V
￫
DB1-342D2…
Motor with delta circuit,
Mains voltage: 1 ~ 230 V; Output voltage: 3 ~ 230 V
￫
DB1-124D3…
Motor connection
DB1 variable
frequency drive
as per
IEC
as per
UL
U
U1 (-U2)
T1 (-T4)
V
V1 (-V2)
T2 (-T5)
W
W1 (-W2)
T3 (-T6)
1410 mi n
230/400 V
3.2/1.9 A
50 Hz
-1
0,75 KW
cos ϕ 0.79
U1
V1
W1
W2
U2
V2
U1
V1
W1
W2
U2
V2