4.4.1 Starting method
Continuous operation
We recommend star-delta starting, soft starter or
frequency converter throughout the entire power
range.
Intermittent operation
Start via softstarter or frequency converter is
mandatory throughout the entire power range.
4.4.2 Wiring diagrams
U1
V1
W1
W2
U2
V2
Fig. 11
Three thermal switches (PTO)
Terminals
Description
Ends of the three stator windings
1, 2, 3, 4, 5, 6
(U1, U2, V1, V2, W1, W2)
11, 12
Thermal switches (F6)
21, 22
Leak sensor in gearbox (B)
PTO
LS
PE
B
U1
V1
W1
W2
U2
V2
Fig. 12
Three PTC sensors
Terminals
Description
Ends of the three stator windings
1, 2, 3, 4, 5, 6
(U1, U2, V1, V2, W1, W2)
PTC sensors (according to DIN 44
31, 32
081) (1, 2, 3)
21, 22
Leak sensor in gearbox (B)
4.4.3 Direction of rotation
When the electrical connections have been carried
out, check that the impeller is rotating in the correct
direction. When viewed from the motor, the impeller
must rotate clockwise. An arrow on the motor
housing shows the correct direction of rotation.
If the impeller rotates in the wrong direction,
interchange two phases of the mains supply (L1, L2,
L3).
PTC
LS
PE
11