Maintenance Tasks; Troubleshooting And Possible Solutions - Wilo Drain TP 80 Notice De Montage Et De Mise En Service

8.2.2 Once a month
• Power consumption and voltage check
• Inspection of the switchgear/relays used
8.2.3 Every six months
• Visual inspection of the power supply cable
• Visual inspection of accessories
8.2.4 8000 operating hours or after 2 years at the latest
• Functional inspection of all safety and monitoring
devices
8.2.5 15000 operating hours or after 10 years at the latest
• General overhaul

8.3 Maintenance tasks

8.3.1 Insulation resistance check
To check the insulation resistance, the power supply
cable must be disconnected. Resistance can be meas-
ured with an insulation tester (measuring voltage:
1000 V). The resistance must not fall below the follow-
ing values:
• At the time of initial commissioning: Insulation resist-
ance should not fall below 20 M.
• For further measurements: Value must be greater
than 2 M.
For motors with an integrated capacitor, the
windings must be short-circuited before check-
ing.
If the insulation resistance is too low, it is possi-
ble that moisture has penetrated into the cable
and/or motor. Do not connect the device again
and consult the manufacturer!
8.3.2 Power consumption and voltage check
Check current consumption and voltage at all 3 phases
at regular intervals. This remains constant during nor-
mal operation. Slight fluctuations depend on the cha-
racteristics of the fluid. Current consumption can
provide an early indication of damage and/or malfunc-
tions in the impeller, bearings and/or motor, which can
be rectified. Consequently, major secondary damage
can be prevented to a large extent and risk of total
breakdown can be reduced.
8.3.3 Inspection of the switchgear/relays used
Check the used switchgear/relays for proper function.
Faulty devices must be replaced immediately as they
provide no protection to the device. For the inspection
instructions, see the Installation and operating instruc-
tions for the switchgear/relay.
8.3.4 Visual inspection of the power supply cable
The power supply cables must be checked for blisters,
cracks, scratches, abrasion and/or crushing. If any
damage is detected, the damaged power supply cable
must be replaced immediately.
The cables may only be replaced by Wilo cus-
tomer service or an authorised or certified ser-
vice centre. The device may only be started up
Installation and operating instructions Wilo-Drain TP 80, TP 100
again once the damage has been properly reme-
died!
8.3.5 Visual inspection of accessories
Accessories must be checked to ensure they are prop-
erly fitted and function correctly. Loose and/or faulty
accessories must be repaired or replaced immediately.
8.3.6 Functional inspection of safety and monitoring devic-
es
Motor protection, overvoltage relay and other triggers
can generally be triggered manually for test purposes.
To check the leakage detection or the temperature
sensor, the unit has to be cooled to the ambient tem-
perature and the electrical connection of the monito-
ring equipment has to be disconnected in the
switchgear. The monitoring equipment can then be
checked with an ohmmeter.
The following values should be measured:
• Bimetallic strip: Value = "0" passage.
• PTC thermistor sensor: A PTC thermistor sensor has a
cold resistance of between 20 and 100 Ω.
• If there are 3 sensors in series, this results in a value
of 60 to 300 Ω.
• If there are 4 sensors in series, this results in a value
of 80 to 400 Ω.
• Pt100 sensor: Pt100 sensors have a value of 100 Ω at
0 °C. Between 0 °C and 100 °C, this value increases by
0.385 Ω every 1 °C. At an ambient temperature of
20 °C, they reach a value of 107.7 Ω.
• Leakage detection: This value must approach "infi-
nity". If the value is low, there is water in the motor.
If there are larger deviations, consult the manu-
facturer!
8.3.7 General overhaul
In a general overhaul, the normal maintenance work is
carried out and in addition the motor bearings, shaft
seals, O-rings and power supply cables are checked
and replaced, if necessary. This work may be per-
formed only by the manufacturer or an authorised ser-
vice centre.

9 Troubleshooting and possible solutions

In order to prevent damage to property or serious per-
sonal injury when repairing malfunctions on the device,
the following points must always be observed:
• Attempt to remedy a fault only if you have qualified
staff. This means that each job must be carried out by
trained and qualified personnel. For example, electrical
work must be performed by a qualified electrician.
• Always secure the device against an accidental restart
by disconnecting it from the mains. Take appropriate
safety precautions.
• Always have a second person on hand to ensure that
the device is switched off in an emergency.
• Secure moving parts to prevent injury.
• Unsanctioned modifications to the device are made at
the operator's own risk and release the manufacturer
from any warranty obligations!
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