KSB UPA Installation & Operating Manual page 48

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5 Installation at Site
Three-phase (3~) motors with two power cables for DOL starting
The six current-carrying conductors of the two power cables are designated U1, V1,
W1 and U2, V2, W2; the earth conductor is marked PE.
ü The motors are wired for both star and delta operation, as shown on the name
plate.
1. Depending on the winding voltage, wire the motors in delta (∆) or star (Y)
configuration in the control unit (e.g. 400 V / 690 V)
ð For a supply voltage of 400 V, connect the motor in delta (∆) configuration.
ð For a supply voltage of 690 V, connect the motor in star (Y) configuration.
L2 L3
L1
U V W PE
U1 W2
V1
U2
W1
V2
3~
a)
Fig. 21: Circuit diagram: motors with two power cables for DOL starting; a) star, b)
delta
1 Motor
3 Core marking
5 Line conductor
PE Earth conductor; core marking:
green/yellow
UPA / UPA S
5 L1
4
U
PE
W
V
3
U
2
1
2 Motor power cable
4 Control unit
6 Star point
L2 L3
V W PE
PE
6
U2
V2
W2
3~
b)