Grundfos DWK Safety Instructions And Other Important Information page 4

Operating modes
WARNING
Electric shock
Death or serious personal injury
- The pump must be stopped by signal
from the level sensors depending on the
S1 or S3 operation modes.
- The pump must be stopped when the
liquid level falls below the top cover
(S1) when operated continuously in S1
mode.
- The pump must be stopped when the
liquid level falls below the mid stator
housing (S3) when operated
intermittently in S3 mode.
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 1 Operating levels of DWK
Fig. 2 Operating levels of DPK
4
S3, intermittent operation
S3 operation is a series of identical duty cycles (TC)
each with a constant load for a period, followed by a
rest period. Thermal equilibrium is not reached
during the cycle.
S1, continuous operation
In this operating mode, the pump can operate
continuously without being stopped for cooling.
Being completely submerged, the pump is
sufficiently cooled by the surrounding liquid.
Handling and storing the product
Applications and intended use
DWK pumps are used for removal of surface,
drainage and underground water containing
abrasives such as sand and gravel.
DPK pumps are used for removal of surface,
drainage and underground water in permanent or
temporary installations. DPK.V pumps can
additionally be used for effluent and screened
wastewater.
Improper operating methods
The operational safety of the pump is only
guaranteed if it is used in accordance with section
S1
Applications and intended
S3
Approvals
The standard version of the DWK pumps has been
tested by TÜV according to EC Council Machinery
Directive 2006/42/EC, registration no. AM 50143413
and report no. 13009106 001.
The standard version of the DPK pumps has been
tested by TÜV according to EC Council Machinery
Directive 2006/42/EC, registration no. AM 50143414
and report no. 13009107 002.
S1
S3
CAUTION
Sharp element
Minor or moderate personal injury
- Wear protective clothing (gloves) when
working on the pump.
use.
Other applications or the operation of
pumps in ambient and operating
conditions, which are not approved, are
considered improper and are not
permitted.
The pump is not to be used for drinking
water.