Connect the three phase motor with delta connection
► Connect the three phase motor according to the connection diagram.
U3
U2
U4
U1
V3
V2
V4
V1
V
W3
W2
W4
W1
L1
L2
L3
Fig. 10:
Star circuit
Connect the three phase motor with star circuit
► Connect the three phase motor according to the connection diagram.
5.6.2 Connect three phase motor with 6-pin terminal board
There are 2 different circuit configurations:
● Delta connection for low voltage
● Star circuit for high voltage
W2
U1
U2
V2
V
V1
W1
L1
L2
L3
Fig. 11:
Delta connection
The 3 wires are connected in series. Their connection points are 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
∆
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
Connect the three phase motor with delta connection
► Connect the three phase motor according to the connection diagram.
V
L1
L2
L3
W2
U1
U2
V2
V1
W1
Fig. 12:
Star circuit
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.
Connect the three phase motor with star circuit
► Connect the three phase motor according to the connection diagram.
5.6.3 Frequency inverter for vacuum pumps with 3-phase motor
Rotary vane pumps with variable rotation speed can be operated within a mains frequency range of 35
to 60 Hz. Start-up is ramped (maximum run-up time: 30 s). Shutdown can take place immediately.
Installation
25/60
