Delta connection
W2
U1
L1
V2
V1
W1
U2
L3
L2
W2
U2
V2
U1
V1
W1
L1
L2
L3
Fig. 9:
Delta connection for low voltage
The 3 phases are connected in series and the connection points connected to the mains. The voltage
per phase is equal to the mains voltage, while the mains current is √3 times the phase current. The del-
ta connection is marked with the Δ symbol. The voltage between the incoming mains supply lines is
called mains voltage. The mains current is the current flowing in the incoming supply lines.
Star circuit
W2
U1
L1
V2
V1
W1
U2
L3
L2
W2
U2
V2
U1
V1
W1
L1
L2
L3
Fig. 10:
Star circuit for high voltage
The ends of the 3 phases are connected in the star point. The terminal voltage is √3 times the phase
voltage, the mains current is equal to the phase current. The star circuit is marked with the Y symbol.
5.4.2 Three phase motor with 9-pin terminal board
NOTICE
Risk of damage from high starting torque!
The specific load behavior of the pump requires a direct start-up.
► Always start the motor directly; do not use a star-delta starting circuit.
Ports T1 – L2, T2 – L1 and T3 – L3 rotate the motor shaft clockwise when looking at the motor fan.
Double star circuit
L1
L2
L3
T5
T6
T4
T9
T8
T7
T3
T2
T1
Fig. 11:
Terminal board for low voltage
Installation
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