20
11.2 Operating modes
The pumps are designed for intermittent operation
(S3). When completely submerged, the pumps can
also operate continuously (S1).
Fig. 11
Operation levels
•
S3, intermittent operation:
The electronics of the pump will in due time stop
the pump automatically. The operating mode S3
means that within 10 minutes the pump must run
for 4 minutes and be stopped for 6 minutes.
See fig. 12.
In this operating mode, the pump is partly
submerged in the pumped liquid, i.e. the liquid
level reaches at minimum the middle of the motor.
See fig. 11.
Fig. 12
S3 operation
•
S1, continuous operation:
In this operating mode, the pump can operate
continuously without having to be stopped for
cooling. See fig. 13. Being completely submerged,
the pump is sufficiently cooled by the surrounding
liquid. See fig. 11.
Fig. 13
S1 operation
11.3 Direction of rotation
All
single-phase
pumps are factory-wired for the
correct direction of rotation.
The electronics incorporated in
three-phase
pumps
ensures that the pump does not start with a wrong
phase sequence, and consequently wrong direction
of rotation.
If the pump does not run, and the liquid level is
above the dry-running sensors, interchange L1 and
L2.
Fig. 14
Jerk direction
11.4 Resetting the pump
To reset the pump, switch off the power supply to the
pump for 1 minute, and switch it on again.
12. Maintenance and service
Before carrying out maintenance and service, it must
be ensured that the pump has been thoroughly
flushed with clean water. Rinse the pump parts in
water after dismantling.
TM
04
48
61
21
09
TM
04 45
27 150
9
TM
04
45
28
15
09
S1
S3
Operation
Stop
6 min.
4 min.
10 min.
P
t
P
t
Note
The pump rotates clockwise when
viewed from above. When started, the
pump will jerk in the opposite direction
of the direction of rotation.
TM
04
48
63
21
09
Warning
Before starting work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched off. It must be ensured that
the power supply cannot be
accidentally switched on.
All rotating parts must have stopped
moving.
Warning
Except for service on the hydraulic
part, all other service work must be
carried out by Grundfos or an
authorised service workshop approved
for servicing Ex products.
