Maintenance Tasks; Troubleshooting And Possible Solutions - Wilo Drain TS 50 Betriebsanleitung

8.3 Maintenance tasks

8.3.1 Checking the insulation resistance
To check the insulation resistance, the power supply
cable must be disconnected. The resistance can then
be measured with an insulation tester (measuring volt-
age = 1,000 V). The following values may not be
exceeded:
• For the initial start-up: Minimum insulation resis-
tance 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, moisture
may have penetrated the cable and/or the motor.
Do not connect the machine, consult manufac-
turer.
8.3.2 General overhaul
During a general overhaul, the bearings, shaft seals,
O rings and power supply cables are inspected and
replaced as required in addition to normal maintenance
work. This work may only be conducted by the manu-
facturer or an authorized service workshop.

9 Troubleshooting and possible solutions

In order to prevent damage or injury while rectifying
product faults, the following points must be observed
in all cases:
• Only attempt to rectify a fault if you have qualified
staff. This means that each job must be carried out by
trained specialist staff. For example, electrical work
must be performed by a trained electrician.
• Always secure the product 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 product has been switched off for safety.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the product are made at the
operator's own risk and release the manufacturer from
any warranty obligations.
9.0.1 Fault: The unit will not start
1 Electricity supply interrupted, short circuit or earth
fault in the cable or motor windings
• Have the motor and wires checked by a specialist
and replaced if necessary.
2 Fuses, the motor protection switch and/or monitoring
devices are triggered
• Have a specialist inspect the connections and cor-
rect them as necessary.
• Have the motor protection switches and fuses
installed or adjusted according to the technical speci-
fications, and reset monitoring equipment.
• Check that the impeller/propeller runs smoothly.
Clean or free it as necessary.
3 The moisture sensors (optional) have interrupted the
power circuit (operator-related)
Installation and operating instructions Wilo-Drain TS 50, TS 65, TP 50, TP 65
• See fault: Mechanical shaft seal leak, moisture sen-
sors report a fault or shut down the unit.
9.0.2 Fault: The unit starts, but the motor protection
switch triggers shortly after start-up
1 The thermal trigger on the motor protection switch is
incorrectly set
• Have a specialist compare the setting of the trigger
with the technical specifications and correct if nec-
essary.
2 Increased power consumption due to major voltage
drop
• Have an electrician check the voltage on each phase
and rewire if necessary.
3 Two-phase operation
• Have a specialist inspect the connection and correct
it as necessary.
4 Excessive voltage differences on the three phases
• Have a specialist inspect the connection and the
switching system and correct it as necessary.
5 Incorrect direction of rotation
• Swap the two phases from the mains supply.
6 Impeller/propeller impeded by adhesive material,
blockages and/or solid matter, increased current con-
sumption
• Switch off the unit, secure it against being switched
on again, free the impeller/propeller or clean the
intake port.
7 The pumped fluid is too dense
• Contact the manufacturer.
9.0.3 Fault: Unit runs but does not pump
1 No pumped fluid
• Open the container intake or sliders.
2 Intake blocked
• Clean the intake, slider, intake port or intake strainer.
3 Impeller/propeller blocked or obstructed
• Switch off the unit, secure it against being switched
on again and free the impeller/propeller.
4 Defective hose or pipeline
• Replace defective parts.
5 Intermittent operation
• Check the control panel.
9.0.4 Fault: The unit runs, but not at the stated operating
levels
1 Intake blocked
• Clean the intake, slider, intake port or intake strainer
2 Slider in the discharge pipe closed
• Fully open the slider
3 Impeller/propeller blocked or obstructed
• Switch off the unit, secure it against being switched
on again and free the impeller/propeller
4 Incorrect direction of rotation
• Replace two phases on the mains supply
5 Air in the system
• Check the pipelines, pressure shroud and/or hydrau-
lics, and bleed if necessary
6 Unit is pumping against excessive pressure
• Check the slider in the discharge pipe and open it
completely if necessary, use a different impeller or
contact the factory
7 Signs of wear
• Replace worn parts
8 Defective hose or pipeline
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