Maintenance and repair
en
Installation and operating instructions Wilo-Rexa PRO
35
9.4.2
Maintenance intervals for use in
sewage lifting units
When the pump is used in sewage lifting units inside buildings or on plots of land, carry
out maintenance intervals and measures in accordance with
DIN EN 12056‑4
!
9.4.3
Maintenance intervals for harsh
conditions
Under harsh operating conditions, specified maintenance intervals must be shortened if
required. Harsh operating conditions include:
▪ Fluids with long-fibre components
▪ Turbulent inlet (e.g. due to air intake, cavitation)
▪ Strongly corroding or abrasive fluids
▪ Heavily gas generating fluids
▪ Operation at an unfavourable duty point
▪ Pressure surges
When using pumps under hard conditions, it is recommended to sign a maintenance
contract. Contact customer service.
9.5
Maintenance measures
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction port. There is danger of limbs be-
ing severed! Protective gloves must be worn to protect from cuts.
WARNING
Hand, foot or eye injuries due to the absence of protective equipment!
Danger of (serious) injuries during work. Wear the following protective equipment:
• Safety gloves for protection against cuts
• Safety shoes
• Closed safety goggles
The following pre-requisites must be fulfilled prior to starting maintenance measures:
▪ Pump cooled down to the ambient temperature.
▪ Pump cleaned thoroughly and disinfected (if required).
9.5.1
Recommended maintenance
measures
Regular inspection of power consumption and the operating voltage in all three phases
is recommended for smooth operation. In normal operation, these values remain con-
stant. Slight fluctuations depend on the characteristics of the fluid. Power consumption
can provide an early indication of damage or malfunctions in the impeller, bearings or
motor, which can be rectified. Larger voltage fluctuations strain the motor winding and
can cause the pump to break down. Regular inspections can therefore largely prevent
major secondary damage and reduce the risk of total breakdown. In this regard, it is re-
commended to use remote monitoring for regular inspections.
9.5.2
Visual inspection of the power
supply cable
The power supply cables must be checked for:
▪ Bubbles
▪ Cracks
▪ Scratches
▪ Abrasion
▪ Crushing
If the power supply cables are damaged, the pump must be decommissioned immedi-
ately! Customer service must replace the damaged power supply cable. The pump may
only be started up again once the damage has been properly remedied.
CAUTION! Water may penetrate into the pump due to the damaged power supply
cables! Water ingress leads to total damage of the pump.
9.5.3
Visual inspection of accessories
Accessories must be checked for:
▪ Correct fixation
▪ Smooth function
▪ Wear symptoms
Any defects detected must be repaired immediately or the accessories must be re-
placed.
