KSB UPA Installation & Operating Manual page 50

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5 Installation at Site
Three-phase (3~) motors with two power cables for star-delta 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.
The motors are wired for both star and delta operation, as shown on the name plate.
5
L1 L2
4
U1 V1 W1
U1
V1
3
W1
2
3~
1
Fig. 23: Circuit diagram: motors with two power cables for star-delta starting
1 Motor
3 Core marking
5 Line conductor
Set the overcurrent relay for the applicable starting method:
▪ For DOL starting to the operating current or, at most, to nominal current I
▪ For star-delta starting to the operating current or, at most, to the nominal
current x 0.58.
NOTE
Fitting an ammeter is recommended.
UPA / UPA S
L3
W2 U2 V2
2 Motor power cables
4 Control unit
PE Earth conductor; core marking:
green/yellow
PE
PE
W2
U2
V2
N