en
18
Installation and operating instructions • Wilo-Rexa FIT-S • Ed.01/2022-03
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 the following operating conditions, shorten the specified
maintenance intervals in consultation with the customer service:
•
Fluids with long-fibre components
•
Turbulent inlet (e.g. due to air entry, cavitation)
•
Highly corrosive or abrasive fluids
•
Strongly gassing fluids
•
Operation at an unfavourable duty point
•
Pressure surges
If there are harsh operating conditions, it is recommended to con-
clude a maintenance contract.
9.5
Maintenance measures
WARNING
Risk of injury from sharp edges on the cut-
ting device!
The macerator has extremely sharp edges. In addi-
tion, sharp edges can form on the suction port.
There is a danger of cuts!
• Wear protective gloves!
• Do not touch the macerator!
Before starting maintenance work, meet the following require-
ments:
•
Wear protective equipment! Observe the work regulations.
–
Safety shoes: Protection class S1 (uvex 1 sport S1)
–
Protective gloves: 4X42C (uvex C500 wet)
–
Safety goggles: uvex skyguard NT
For detailed marking of frame and disc, see the section on “Per-
sonal protective equipment [
5]”.
•
The pump has been thoroughly cleaned and disinfected.
•
Motor must have cooled down to the ambient temperature.
•
Workplace:
–
Clean, good lighting and ventilation.
–
Firm and stable work surface.
–
Secured against falling over and slipping.
NOTICE! Only perform the maintenance work described in these
installation and operating instructions.
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 constant. Slight fluctu-
ations depend on the characteristics of the fluid. Power consump-
tion 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 recommended to use remote monit-
oring for regular inspections.
9.5.2
Visual inspection of the connection cable
Check connection cable for:
•
Bubbles
•
Cracks
•
Scratches
•
Abrasion
•
Pinch points
If the connection cable is damaged:
•
Decommission the pump immediately!
•
Have the connection cable replaced by the customer service!
CAUTION! Material damage! Damaged connection cables cause
water to enter the motor. Water in the motor leads to total
damage of the pump.
9.5.3
Visual inspection of accessories
Accessories must be checked for:
•
Correct fixation
•
Smooth function
•
Signs of wear, e.g. cracks caused by frequencies
Any defects detected must be repaired immediately or the ac-
cessories must be replaced.
9.5.4
Visual inspection of the coatings and housings
Coatings and housings must not show any damage. If there are de-
fects, observe the following:
•
Repair damaged coating. Order repair kits from the customer
service.
•
If housings are worn out, consult the customer service!
9.5.5
Function test of the monitoring device
To test resistances, the pump must be cooled down to the ambient
temperature!
9.5.5.1 Test the resistor of the temperature sensor
✓
Ohmmeter available.
1.
Measure the resistance.
⇒
Measured value
Bimetallic strip
: 0 ohms (passage).
▶
Resistance checked. If the measured value deviates from
the specification, consult the customer service.
9.5.5.2 Testing the resistor of the external electrode for seal-
ing chamber control
✓
Ohmmeter available.
1.
Measure the resistance.
⇒
Measured values “infinite (∞)”: Monitoring device OK.
⇒
Measured value ≤ 30 kOhm: Water in oil. Change oil.
▶
Resistance checked. If the measured value still deviates
after the oil change, consult customer service.
