8
3.4
Operation
The liquid is suctioned with a minimum supply
pressure on the suction side (A). The pump increases
the pressure. The liquid leaves the pump on the
delivery side (B).
A
Suction side
B
Delivery side
Submersible sewage pumps that have been
equipped with a build-in floater are automatically
switched on and off when reaching a high or low
liquid level respectively.
Solid constituents from the wastewater can pass the
impeller without problems due to the large free
passage opening of the submersible sewage pump.
The performance (capacity and head) of the pump is
determined by the motor power and the impeller type
of the installed submersible sewage pump.
Table 3: Submersible sewage pump version
3.5
Operation of the automatic
level regulation A-series
A-Series switching levels
3.5.1
One pump operation
The pump will randomly start at level S2 or S3 and
will switch itself off at the lowest off switching level
after the initiation phase. The times between the
levels S3, S2 and S1 and the lowest off switching
level are saved in the system memory.
The pump will start at level S2 or S3 during the
following 7 switching cycles. The choice is random.
The off switching moment will be calculated based on
the number of saved starts between the levels S3, S2
and S1 and the lowest off switching level. When the
pump has completed 7 switching cycles based on the
previous calculation, the time measurements and the
detection of the lowest off switching level is repeated
and saved and the newly calculated pumping time is
assigned to the pump. The time will be saved that is
required to reach level S3, S2 or S1 when wastewater
continues to flow in. The period during which the
pump is operational will be adjusted to this.
When the pump has not been operational for a period
of 24 hours, the pump will start until the lowest off
switching level is detected. The test run will be
automatically activated after every 24 hour period
when the water level has not demanded a pump start.
Type
DRV
DRK
DRS
DRSK
Impeller
type
Vortex
impeller
Channel
impeller
Shredder
(hardened
stainless
steel)
Non-
clogging
impeller
Safety class
IP68
Insulation
class
F
Sealing
Double mechanical seal with intermediate oil
chamber
A
B
2666/12092005
2005
0998
