Wiring Diagrams; Direction Of Rotation; Frequency Converter Operation - Grundfos SRG Serie Mode D'emploi

5.4.2 Wiring diagrams

For voltage and starting method 1H, wire the motor using the
delta connection. For voltage and starting method 0H, wire the
motor using the star connection.method. Connection methods are
shown in fig. 10. See also section
position 1 and section 7.2.1 Type key
voltage and starting method.
Delta
W2 U2 V2
U1 V1 W1
L1 L2 L3
Fig. 10 Schematic drawing of delta and star connection
U1 V1 W1
U2 V2 W2
M3~
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)
7.2.2 Nameplate, fig. 16,
to determine your pump's
Star
W2 U2 V2
U1 V1 W1
L1 L2 L3
F6
F6
F6
B
U1 V1 W1
U2 V2 W2
M3~
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 44 081)
31, 32
(ϑ1, ϑ2, ϑ3)
21, 22 Leak sensor in gearbox (B)

5.4.3 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).

5.4.4 Frequency converter operation

All SRG pumps are designed for frequency converter operation
for energy saving and for soft start. For frequency converter
operation, please observe the following information:
• Requirements must be fulfilled.
• Recommendations ought to be fulfilled.
• Consequences must be considered.
B
11