Grundfos S Series User Manual

6. Starting up the product
Start up the pump by either direct-on-line (DOL) or
star-delta (Y/D) starting. The starting method
depends on usage and power supply conditions.
If star-delta starting is used, keep the
switching transient time to a minimum to
avoid high transient torques.
Use a time relay with a switching time of maximum 50
minutes or according to the manufacturer's
specifications.
See the wiring diagrams for direct-on-line and star-
delta starting in figs Direct-on-line starting and Star-
delta starting. See the wiring diagram for sensors in
fig. Wiring diagram for sensors.
V1 W1U1 PE
V2U2W2
PEL1D
M
L3L2
3
TM051638
Direct-on-line starting
V1 W1U1 PE
V2U2W2
PEL1D
M
L3L2
3
TM051639
Star-delta starting
Pos. Description
D Control Cable
Related information
4.2.2 Sensors
6.1 Preparations for starting up
DANGER
Rotating elements
Death or serious personal injury
‐ Before manual startup or changeover
to automatic control, make sure that no
persons are working on or near the
pump.
Before the first startup and after a long
standstill period, make sure the pump is
vented and filled with the pumped liquid.
In dry installations with cooling jacket, the
cooling jacket must always be filled with
pumped liquid during operation.
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English (GB)

Grundfos S Series Specifications

General

Brand	Grundfos
Model	S Series
Category	Water Pump
Language	English