Recommended Maintenance Measures; Visual Inspection Of The Connection Cable; Visual Inspection Of Accessories - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

9.5.1 Recommended maintenance mea-
sures
9.5.2 Visual inspection of the connec-
tion cable
9.5.3

Visual inspection of accessories

9.5.4 Visual inspection of coatings and
housing for wear
9.5.5 Function test of the monitoring
devices
9.5.5.1 Test the resistor of the internal
electrodes for motor compart-
ment monitoring
9.5.5.2 Checking resistor in the tempera-
ture sensor
Installation and operating instructions Wilo-Rexa PRO
Maintenance and repair
WARNING
Hand, foot or eye injuries due to a lack of protective equipment!
During work there is a risk of (serious) injury. Wear the following protective equipment:
• Safety gloves that protect against cuts
• Safety shoes
• Closed safety goggles
Before starting the maintenance measures the following requirements must be fulfilled:
▪ Pump cooled to ambient temperature.
▪ Pump thoroughly cleaned and (if necessary) disinfected.
For smooth operation, it is recommended to carry out regular inspections of the current
consumption and the operating voltage in all three phases. In normal operation, these values
remain constant. Slight fluctuations may occur depending on the characteristics of the fluid.
Using the current consumption, damage or malfunctions in the impeller, bearings, or motor
can be identified at an early stage and rectified. Large voltage fluctuations strain the motor
winding and can cause the pump to break down. Regular inspections can prevent major sec-
ondary damage and reduce the risk of total breakdown. With regard to regular inspections,
the use of remote monitoring is recommended.
Check the 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 start the pump up again once
the damage has been properly remedied!
CAUTION! Due to damaged connection cables, water can penetrate into the pump! Water
ingress causes total breakdown of the pump.
The accessories must be checked for:
▪ Correct attachment
▪ Proper function
▪ Signs of wear, e.g. cracks caused by vibrations
Any detected defects must be repaired immediately or the accessories must be replaced.
The coatings and housing parts must not show any signs of damage. If deficiencies are iden-
tified, the following points must be observed:
▪ If the coating is damaged, the coating must be repaired.
▪ Contact customer service if housing components are worn!
To check the resistors, the pump must be cooled down to ambient temperature!
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, there is water in the motor compartment. Contact
customer service!
Check resistor in the temperature sensor with an ohmmeter. The following measured values
must be complied with:
▪ Bimetallic strip: Measured value = 0 Ohm (passage).
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