Grundfos SRG 60 Hz, Installation And Operating Instructions Manual

Page: 11 / 428

English (GB)
11
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
Fig. 11 Three thermal switches (PTO)
Fig. 12 Three PTC sensors
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).
TM
02
49
40
18
02
Terminals Description
1, 2, 3, 4, 5, 6
Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
11, 12 Thermal switches (F6)
21, 22 Leak sensor in gearbox (B)
B
LS V2 U2 W2 W1 V1 U1 PE PTO
TM
02
49
32
18
02
Terminals Description
1, 2, 3, 4, 5, 6
Ends of the three stator windings
(U1, U2, V1, V2, W1, W2)
31, 32
PTC sensors (according to DIN 44
081) (

1,

2,

3)
21, 22 Leak sensor in gearbox (B)
LS V2 U2 V1 U1 W2 W1 PTC PE