English (GB)
14
4.1 Preparations for starting up
4.1.1 Start and stop levels for auto-coupling installation
The start and stop levels are specified during the design stage.
Always check that the start and stop levels function and possibly
alter them when starting up the pump in order to ensure good
operation.
Stop levels
Fig. 17
Stop levels for auto-coupling installations
Set the stop level according to fig.
, so that the flow velocity in
the pit will increase towards the end of the working cycle. In pits
with several different stop levels, such as in frequency-controlled
installations, program the control sequence to pump down to the
lowest stop level at least once per day to clean out the bottom of
the pit.
The stop levels are determined by the motor submergence
required to ensure cooling, to prevent cavitation or to avoid air
being sucked into the pump inlet. The lowest level cannot always
be foreseen, but must be confirmed through trials during startup.
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
that the pump has been filled with
pumped liquid.
In dry installations with cooling
jacket, the cooling jacket must
always be filled with pumped
liquid during operation. Ensure
this by venting before the first
startup.
T
M
02
40
0
0
03
0
9
In the case of an Ex pump, install
an additional level sensor for the
stop level.
Ex pumps must always be fully
submerged.
Installation type
S (Ex pumps)
Installation type
C (standard
Installation type
S (standard
