en
Maintenance and repair
34
WILO SE 2019-01
the mixer and the installation must be checked regardless of the established mainten-
ance intervals.
9.4.1
Maintenance intervals for normal
conditions
8000 operating hours or after 2 years at most
ƒ
Visual inspection of the connection cable
ƒ
Visual inspection of cable brackets and cable tensioning
ƒ
Visual inspection for wear of the mixer
ƒ
Function test of monitoring devices
ƒ
Visual inspection of accessories
ƒ
Oil change
15000 operating hours or after 10 years at the latest
ƒ
General overhaul
9.4.2
Maintenance intervals for harsh
conditions
Under harsh operating conditions, the specified maintenance intervals must be
shortened as required. Harsh operating conditions include:
ƒ
Fluids with long-fibre components
ƒ
Strongly corrosive or abrasive fluids
ƒ
Highly gaseous fluids
ƒ
Operation at an unfavourable duty point
ƒ
Unfavourable flow conditions (e.g. due to fixtures or aeration)
When using the mixer under harsh conditions, it is recommended that a maintenance
contract be entered into. Contact customer service.
9.5
Maintenance measures
WARNING
The propeller blade has sharp edges!
Sharp edges can form on the propeller blades. There is a risk of limbs being severed.
Wear safety gloves to protect against 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 preconditions must be fulfilled prior to the start of maintenance meas-
ures:
ƒ
Motor must have cooled down to the ambient temperature.
ƒ
Mixer must be thoroughly cleaned and disinfected (if required).
9.5.1
Recommended maintenance
measures
Regular inspection of current 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.
Current consumption can provide an early indication of damage to or malfunctions in
the mixer, which can then be rectified. Larger voltage fluctuations strain the motor
winding and can cause breakdown. 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 connec-
tion cable
Check connection cable for:
ƒ
Bubbles
ƒ
Cracks
ƒ
Scratches
ƒ
Abrasion
ƒ
Pinch points
ƒ
Changes caused by chemical corrosion
