Grundfos SLV.65 Bedienungsanleitung Seite 16

Warning
The pump must not run dry.
An additional level switch must be installed
to ensure that the pump is stopped in case
the stop level switch is not operating. See
fig. 7.
The pump must be stopped when the
liquid level reaches the upper edge of the
clamp on the pump.
Float switches used in potentially
explosive environments must be approved
for this application. They must be
connected to the Grundfos DC, DCD or
LC, LCD 108 pump controller via an
intrinsically safe barrier to ensure a safe
circuit.
Fig. 7 Start and stop levels
16
8.3 Pump controllers
The following LC and LCD pump controllers are
available:
LC controllers are for one-pump-installations and
LCD controllers are for two-pump-installations.
• LC 107 and LCD 107 with air bells
• LC 108 and LCD 108 with float switches
• LC 110 and LCD 110 with electrodes.
In the following description, "level switches" can be
air bells, float switches or electrodes, depending on
the pump controller selected.
Controllers for single-phase pumps incorporate
capacitors.
The LC controller is fitted with two or three level
switches: One for start and the other for stop of
pump. The third level switch, which is optional, is for
high-level alarm.
The LCD controller is fitted with three or four level
switches: One for common stop and two for start of
the pumps. The fourth level switch, which is optional,
is for high-level alarm.
When installing the level switches, observe the
Alarm
following points:
Start
• To prevent air intake and vibrations, install the
stop level switch in such a way that the pump is
stopped before the liquid level is lowered below
Stop
the middle of the stator housing.
Additional • Install the start level switch in such a way that the
stop pump is started at the required level; however,
the pump must always be started before the
liquid level reaches the bottom inlet pipe to the
pit.
• If installed, always install the high-level alarm
switch about 10 cm above the start level switch;
however, the alarm must always be given before
the liquid level reaches the inlet pipe to the pit.
For further information, see the installation and
operating instructions for the pump controller
selected.
Warning
The pump must not run dry.
An additional level switch must be installed
to ensure that the pump is stopped in case
the stop level switch is not operating.
The pump must be stopped when the
liquid level reaches the upper edge of the
clamp on the pump.
Float switches used in potentially
explosive environments must be approved
for this application. They must be
connected to the Grundfos DC, DCD or
LC, LCD 108 pump controller via an
intrinsically safe barrier to ensure a safe
circuit.