6.1.1 Start and stop levels for auto-coupling
installation
To ensure appropriate operation, check if the start
and stop levels function properly. If needed, alter
them when starting up the pump.
Stop levels
Set the stop level according to the figure
below.
TM079253
Stop levels for auto-coupling installations
Pos. Description
1 Installation type S (Ex pumps)
2 Installation type S (standard pumps)
3 Installation type C (standard and Ex pumps)
In case of an Ex pump, install an additional
level sensor for the stop level.
Set the stop level, so the flow velocity in the pit
increase. In pits with different stop levels, program the
control sequence to pump down to the lowest stop
level at least once a day to clean out the bottom of
the pit.
The stop levels are determined by the motor
submergence required to ensure cooling, prevent
cavitation or avoid air being sucked into the pump.
The lowest level must be confirmed through tests
during startup.
6.1.2 Start and stop levels for dry installation
Stop levels
The stop level setting for dry-installed pumps
depends on the inlet height, shape and flow velocity.
Set the stop level approximately one inlet diameter
above the inlet. The final stop level must be
confirmed through test runs during startup.
Start levels
In pits with dry-installed pumps, set the start level
above the pump housing to ensure the cooling jacket
is filled up before the pump starts operating. For
vertical pumps, this height may be set with a margin
according to the figure below.
TM058187
Vertical, dry installation (D)
Use an eccentric reducer between the inlet pipe and
the pump in horizontal installations. The reducer must
be installed so that the straight part faces upwards.
This avoids air accumulation in the inlet pipe and
disturbance of operation. See the figure below.
TM046901
Horizontal, dry installation (H)
30
English (GB)
To Next Page
Loading...
Need help?
General
