Pfeiffer Vacuum DUO 5 MC, Руководство по эксплуатации, Страница: 26 / 60

5.5.2 Connect three phase motor with 6-pin terminal board
NOTICE
Property damage from high starting torque
The specific load behavior of the vacuum pump requires direct on-line starting at full motor power.
Engine damage occurs if a different starting circuit is used.
► Always start the motor directly.
►
Never use a star-delta start-up circuit.
Ports U1 – L2, V1 – L1 and W1 – L3 rotate the motor shaft clockwise when looking at the motor fan.
W2 U1
L1
V2 V1
W1 U2
L3
L2
W2 U2 V2
U1 V1 W1
L1 L2 L3
Fig. 10: Delta connection for low voltage
The 3 phases are connected in series, and their 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 ∆ 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.
W2
U1
L1
V2
V1
W1
U2
L3
L2
W2 U2 V2
U1 V1 W1
L1 L2 L3
Fig. 11: 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.
5.5.3 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.
5.5.4 Checking the direction of rotation
Operating fluid leaks out
The direction of rotation must be checked on vacuum pumps with three phase motors. If
the direction of rotation for the vacuum pump is incorrect, there is a risk of operating fluid
escaping at the vacuum flange.
● Check the direction of rotation before refilling operating fluid.
Installation
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