U3
U2
U4
U1
V3
V2
V4
V1
V
W3
W2
W4
W1
L1
L2
L3
Fig. 12:
Double star circuit
Connect the three phase motor with double star circuit
► 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. 13:
Delta connection
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. 14:
Star circuit
Connect the three phase motor with star circuit
► Connect the three phase motor according to the connection diagram.
5.7.3 Checking the direction of rotation
NOTICE
Equipment damage from incorrect direction of rotation
The direction of rotation must be checked on vacuum pumps with three phase motors. If the vacuum
pump has an incorrect direction of rotation, damage may be caused to the pumping system after a
short time.
► Determine the intended direction of rotation based on the arrow sticker.
► Fill in the operating fluid only after that.
Procedure
1. Switch on the vacuum pump briefly (2 to 3 seconds).
– The motor and motor fan must rotate counter-clockwise (see the arrow on the fan cover).
2. If the direction of rotation is incorrect, exchange the 2 phases on the connection cable.
5.7.4 Setting the motor protection switch
Motor protection switches are current-dependent protective devices for the drive motors. Protection
switches with slow tripping characteristics are suitable.
An increase of 1.5 times the rated current over a 2 minute period is permissible for the drive motors (in
accordance with EN 60034-1), without tripping the motor protection switch.
Installation
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