Wilo FK 17.1 - Page 183

Maintenance and repair en
Installation and operating instructions Wilo Motor FK 17.1, FK 202, FK 34, FK 42 + EMU FA, Rexa SUPRA, Rexa SOLID 183
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).
9.6.1 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.
9.6.2 Visual inspection of the connec-
tion cable
Check connection cable for:
▪Bubbles
▪Cracks
▪Scratches
▪Abrasion
▪Pinch points
If damage is identified on the connection cable, decommission the pump immediately!
Have the connection cable replaced by Wilo customer service. Only operate the pump
up again once the damage has been properly remedied!
CAUTION!Water may penetrate into the pump due to the damaged connection
cable! Water ingress leads to total failure of the pump.
9.6.3 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 accessories must be re-
placed.
9.6.4 Visual inspection of coatings and
housing for wear
The coatings and housing parts must not show any signs of damage. If there are de-
fects, the following must be observed:
▪If the coating is damaged, it must be restored.
▪Contact customer service if housing parts have worn out!
9.6.5 Function test of the monitoring
device
To test resistances, the pump must be cooled down to the ambient temperature!
9.6.5.1 Test the resistor of the internal
electrodes for motor compart-
ment and sealing chamber control
(FK34 and FK42 only)
The internal electrodes are switched in parallel. During testing, all the electrodes are
measured together.
Measure the resistor of the electrodes with an ohmmeter. The measured value must ap-
proach “infinity”. For values ≤30kOhm, there is water in the motor compartment or the
sealing chamber. Change the oil in the sealing chamber and measure again.
NOTICE!If the value is still ≤30kOhm, contact customer service!
9.6.5.2 Test the resistor of the temper-
ature sensor
Measure the resistor of the temperature sensors with an ohmmeter. The following
measured values must be complied with:
▪Bimetallic strip: Measured value = 0ohms (continuity).
▪PTC sensor (PTC thermistor): Measured value depends on the number of sensors in-
stalled. A PTC sensor has a cold resistance range of 20to 100ohms.