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Faults, causes and remedies
236
WILO SE 2018-05
▪ Correct fixation
▪ Smooth function
▪ Wear symptoms
Any defects detected must be repaired immediately or the accessories must be re-
placed.
9.5.3
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!
9.5.4
Function test of the monitoring
device
To test resistances, the pump must be cooled down to the ambient temperature!
9.5.4.1
Test the resistor of the internal
electrodes for motor compart-
ment monitoring
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.
Con-
tact customer service!
9.5.4.2
Test the resistor of the temperat-
ure sensor
Measure the resistor of the temperature sensors with an ohmmeter. The following
measured values must be complied with:
▪
Bimetallic strip
: Measured value = 0 Ohm (passage).
▪
PTC sensor
(PTC thermistor): Measured value depends on the number of sensors in-
stalled. At PTC sensor has a cold resistance of between 20 and 100 Ohm.
– With
three
sensors in series, the measured value is between 60 und 300 Ohm.
– With
four
sensors in series, the measured value is between 80 und 400 Ohm.
9.5.4.3
Testing the resistor of the ex-
ternal electrode for sealing cham-
ber control
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach “infinity”. For values ≤ 30 kOhm, if there is water in the oil – change the oil!
9.5.5
Oil change
An oil change is recommended for these pumps after 2 years. Customer service carries
out the oil change on-site.
9.5.6
General overhaul
During the general overhaul, the motor bearings, shaft sealings, O-rings and power
supply cables are checked for wear and damage. Damaged components are replaced
with original parts. This will ensure correct operation.
The general overhaul is performed by the manufacturer or an authorised service centre.
10
Faults, causes and remedies
DANGER
Danger due to fluids hazardous to health!
Danger of death in case of pumps with fluids hazardous to health! Wear the follow-
ing protective equipment while performing the work:
• Closed safety goggles
• Breathing mask
• Protective gloves
⇒ The equipment listed here is the minimum requirement, observe the spe-
cifications of the work regulations! The operator must make sure that the
personnel have received and read the work regulations!
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance
with the locally applicable regulations.
