Electrical Maintenance - Grundfos Multilift MOG Manual Del Usuario

According to EN 12056-4, lifting stations must be checked at the
following regular intervals:
• every 12 months in single-family houses
• every 6 months in multi-family dwellings
• every 3 months in commercial and industrial applications.
During the check, local regulations must be observed.
The periodic checks of the lifting station should be carried out by
authorised personnel and must comprise electrical and
mechanical maintenance.
Check the following points:
• Outlet and inlet connections
Check all connections to the lifting station for tightness and
leakages. Make sure that weight from the inlet, outlet and vent
pipes does not rest on the tank. Long pipe sections, valves,
etc. must be supported.
• Power consumption
See nameplate.
• Cable entry
Make sure that the cable entry is watertight and that the
cables are not bent sharply and/or pinched.
• Pump parts
Open the clamp of the pump housing, remove the pump from
the tank and check the grinder system. Check that the vent
tube to the tank is not blocked. When the pump is mounted
again, we recommend replacing the O-ring between pump and
tank. Make a test run with clean water. In case of noise,
vibration or abnormal running, contact Grundfos.
• Ball bearings
Check the shaft for noisy or heavy operation. Replace
defective ball bearings. A general overhaul of the pump is
usually required in case of defective ball bearings or poor
motor function. This work must be carried out by the
manufacturer or an authorised service workshop.
• Check non-return and isolating valves for correct function.
10.1 Mechanical maintenance
• Remove possible deposits and/or sludge buildup in the
collecting tank.
• Remove any blockages on the inlet side of the lifting station. A
blockage will typically be a large solid object.
• Check and replace the gaskets of connections at valves, etc.,
if necessary.
• Check the tank for cracks and deformations. These may occur
in case of faulty assembly and therefore excessive stress on
the tank.
The above list is not complete. The lifting station may
be installed in environments which require thorough
Note
and regular maintenance.

10.2 Electrical maintenance

• Check the gasket of the LC 221 cabinet front cover and of the
cable entries.
• Check the cable connections.
• Check the controller functions.
• Check and clean the level sensor. See section
the level sensor.
• If LC 221 is installed in a particularly moist environment in a
basement, we recommend checking the terminals on the PCB
in order to identify possible corrosion. In typical installations,
the terminals will work for several years and do not require any
inspection.
• Replace the 9 V battery, if fitted, in connection with annual
service.
The above list is not complete. LC 221 may be
installed in environments which require thorough and
Note
frequent maintenance.
26
10.3 Cleaning the level sensor
1. Push the ON-OFF-AUTO selector switch to position OFF ( ).
See section
2. Loosen the screw cap by turning it counterclockwise.
See fig. 30.
3. Lift the sensor carefully out of the collecting tank. Do not lift it
by means of the hose.
4. Check for possible deposits on or in the pressure tube. See
section
5. Scrape off any deposits. If necessary, remove the hose from
the controller, and rinse the tube and hose with clean water at
low pressure. Make sure no water remains in the hose.
6. Refit the pressure tube by screwing the screw cap on to the
tank. Reconnect the hose to the controller. Check the sensor
by test running Multilift MOG or MDG.
Fig. 30 Removing the level sensor
10.4 Contaminated lifting station or components
If Grundfos is requested to service the lifting station, Grundfos
must be contacted with details about the pumped liquid, etc.
before the lifting station is returned for service. Otherwise
Grundfos can refuse to accept the lifting station for service.
Lifting stations which have been in contact with the pumped liquid
must be thoroughly cleaned before they are returned to Grundfos.
Any costs of returning the lifting station are to be paid by the
customer.
However, any application for service (no matter to whom it may
be made) must include details about the pumped liquid if the
lifting station has been used for liquids which are injurious to
health or toxic.
10.3 Cleaning
5.2.2 Control panel.
5.1.5 Level sensor.
Warning
If a Multilift lifting station has been used for a liquid
which is injurious to health or toxic, it will be
classified as contaminated.