9
water solutions
EN
BoxPRO – Translation of original instructions
covers the lifting station (FIG. 10).
Any loads on the system must be transferred to the concrete structure
and must not weigh on the tank since it is not intended as a structural
component but simply as a container for wastewater.
For specifications of the type of concrete to be used to construct the
covering platform, consult a civil engineer or specialist technician.
17. Control system
The lifting station is controlled by a control panel which can be supplied
with the system.
The basic functions of this device are:
•
Control of pump operation (start/stop) and of alternation cycles (for
dual pump installations).
•
Signalling of breakdowns by means of an alarm light/buzzer or a
remote monitoring system.
The float switches are the standard level control system used with the
control panel.
An ultrasound or piezoresistive probe level control system is available
on request.
18. Float switches
The lifting station uses float switches to control the stop and start levels
of the pumps installed.
Single lifting station
FIG. 11)
:
This uses 3 float switches:
1. Stop float switch (set for the minimum level)
2. Start float switch (set for the maximum level)
3. Alarm float switch to prevent overflows (optional)
Double lifting station
(FIG. 12)
:
This uses 4 float switches:
1. Stop float switch (set for the minimum level)
2. Pump 1 start float switch (set for the maximum level)
3. Pump 2 start float switch (set for the maximum level)
4. Alarm float switch to prevent overflows (optional)
At each start/stop cycle, the control panel reverses the operating order
of the pumps installed (alternation cycle) to ensure that the work load
is equally shared.
The float switches are pre-installed in the factory and are set for opti-
mal use of the lifting station.
If special setups are required, the heights of the float switches can be
varied to obtain different start and stop levels.
However, users are advised to keep
(FIG.13)
:
•
The start float switch just below the bottom edge of the intake pipe-
line (h
min
)
•
The stop float switch just below the pump motor cover to prevent
dry running (h
max
).
•
The alarm float switch just below the top opening to warn that the
liquid will soon overflow (h
tot
).
19. Electrical connections
The connections between the pumps and float switches and the con-
trol panel must be made by qualified staff.
Refer to the wiring diagram supplied with the control panel.
20. Starting the pumping station
Once installation has been completed and the wiring has been che-
cked to ensure that it is correct, a test should be run to ensure that the
lifting station is in perfect working order.
•
Place enough water in the tank to ensure that the pump will not run
dry;
•
Close the outlet gate valve ALMOST COMPLETELY;
•
Simulate operation of the system by operating the float valves by
hand as described below:
Single lifting station:
•
Raise the STOP float switch. (Nothing happens)
•
Keeping the stop float switch raised, raise the START float switch.
The pump must start.
•
Lower the START float switch. (Nothing happens)
•
Lower the STOP float switch. The pump stops.
Double lifting stations:
•
Raise the STOP float switch. (Nothing happens)
•
Keeping the stop float switch raised, raise the first START float
switch. Pump 1 must start.
•
Also keeping the first start float switch raised, raise the second
START float switch.
•
Pump 2 must start.
•
Lower the start float switches (nothing happens)
•
Lower the stop float switch. The pumps stop.
Repeat the operation to check that the control panel reverses the star-
ting order of the pumps installed at each cycle.
warning
!
This procedure must only be carried out for a few seconds, since
prolonged operation with the outlet gate valve closed might da-
mage the motor.
21. Alarm float switch
To check operation of the level alarm float switch, simply raise this
float switch to the START position to trigger the control panel alarm
function.
Lower the float switch to stop the alarm.
22. General maintenance
It is important to inspect the lifting station often to guarantee trouble-
free operation and prevent too much residue from building up inside it.
The system must be started up at least once every 6 months.
Generally, the pumps installed in a lifting station are connected so that
they operate automatically and they may start up without warning.
Therefore, make sure that the electrical and drainage system connec-
tions have been cut off before doing any work on the station.
If greasy materials have built up, pour detergent into the affected area
and leave it to act for a while, then rinse. Repeat if necessary.
This will assure that the float switches move freely.
In areas with large amounts of grease, fit a suitable filter upstream of
the lifting station.
