Maintenance Tasks - Wilo EMU FA Serie Instrucciones De Instalación Y Funcionamiento

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When the equipment is used in waste water
pump stations inside buildings or on properties,
the maintenance intervals and work shown in
DIN EN 12056-4 must be adhered to.
8.2.1. Intervals for normal operating conditions
Prior to the initial commissioning phase or after
an extended period of storage
• Check the insulation resistance
• Turn the impeller
• Check the oil level in the sealing chamber
8,000 operating hours or after two years,
whichever is earlier
• For all motors generally
• Visual inspection of the power supply cable
• Visual inspection of accessories
• Visual inspection of the housing for wear
• Functional inspection of all safety and control
devices
• Inspection of the switching devices/relays in
use
• Changing the oil
If an electrode is used to monitor the sealing
chamber, the oil is changed in accordance with
the display.
• Maintenance work according to size
• T 20.1, T 50, T 50.1, T 72: Emptying the leakage
chamber
• T 50, T 50.1, T 72: Lubricate the roller bearings
• T 24 ... T 72: Draining condensation
15,000 operating hours or after ten years,
whichever is earlier
• General overhaul
8.2.2. Intervals for difficult operating conditions
For difficult operating conditions, the main-
tenance intervals stated should be shortened
accordingly. If this is the case, please contact Wilo
customer service. If the pumps are to be used in
difficult conditions, we also recommend that you
take out a maintenance contract.
The following are considered difficult operating
conditions:
• Large quantities of fibrous materials or sand/grit
in the fluid
• Turbulent intake (caused by air entering or cavi-
tation, for example)
• Highly corrosive fluids
• Highly gaseous fluids
• Unfavorable duty points
• Operation at risk from water hammers
8.2.3. Maintenance tasks recommended to ensure
smooth operation
We recommend that the current consumption and
operating voltage are checked regularly during
all phases. These values remain constant during
normal operation. Slight fluctuations are a result
of the composition of the pumped fluid. The cur-
rent consumption can assist in early detection
and correction of damage and/or faulty operation
62
in the impeller, bearings and/or the motor. Larger
voltage fluctuations strain the motor winding and
can lead to failure of the pump. Regular checks
can therefore prevent greater damage from oc-
curring later and reduce the risk of a total failure.
We recommend using remote monitoring for the
regular checks. Please contact Wilo customer
service about this.

8.3. Maintenance tasks

Before performing maintenance:
• Disconnect the pump from the electricity supply
and secure it to prevent accidental activation.
• Let the pump cool down and clean it thoroughly.
• Any drops must be removed immediately!
• Ensure that all operating parts are in good con-
dition.
8.3.1. Check the insulation resistance
To check the insulation resistance, the power
supply cable must be disconnected. The resis-
tance can then be measured with an insulation
tester (measuring voltage = 1000 V). The values
may not fall below the following:
• For the initial commissioning phase: The insula-
tion resistance may not be less than 20 MΩ.
• For further measurements: The value must be
greater than 2 MΩ.
If the insulation resistance is too low, mois-
ture may have penetrated the cable and/or the
motor. Do not connect the pump. Consult the
manufacturer!
8.3.2. Turn the impeller
1. Lay the pump horizontally on a firm surface.
Make sure that the pump cannot fall and/or slip
away!
2. Slowly and carefully reach into the hydraulics
housing from below and turn the impeller.
BEWARE of sharp edges!
Sharp edges can form on the impellers and
hydraulic opening. There is a risk of injuries!
Wear the necessary protective clothing,
e.g. safety gloves.
8.3.3. Checking the oil level in the sealing chamber
Depending on the motor, either a single or two
separate openings are used to empty and fill the
sealing chamber.
BEWARE of injuries from hot and/or pressur-
ized lubricants!
After the unit is switched off, the oil is still
hot and under pressure. This can force out
the plug, causing hot oil to escape. Beware
of injuries or burns! Let the oil cool down to
ambient temperature first.
MAINTENANCE
WILO SE 05/2014 v05 DIN A4