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10.1
Personnel qualifications
10.2
Operation monitoring
54
Maintenance/repair
DANGER
Risk of fatal injury due to electrical current!
Improper conduct when carrying out electrical work can lead to death due to electric
shock!
• Any work on electrical devices may only be carried out by a qualified electrician.
• Before carrying out any work, disconnect the unit from the power supply and
secure it against accidental switch-on.
• Any damage to the pump connection cable should only ever be rectified by a
qualified electrician.
• Observe the installation and operating instructions for the pump, motor and
other accessories.
• Never poke around in the electronic module or motor openings or insert any-
thing into them.
• Never operate the pump without the electronic module being installed.
• Reinstall any uninstalled safety devices, such as module or coupling covers,
once the work is complete.
WARNING
Sharp edges on the impeller!
Sharp edges can form on the impeller. There is danger of limbs being severed! Pro-
tective gloves must be worn to protect against cuts.
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Electrical work: A qualified electrician must carry out the electrical work.
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Maintenance tasks: The technician must be familiar with the use of operating fluids
and their disposal. In addition, the technician must have basic knowledge of mech-
anical engineering.
CAUTION
Risk of material damage!
Improper operation can damage the pump or motor. Operating with the shut-off
device closed is not recommended and generally dangerous in the case of hot fluids.
The pump must not be allowed to operate dry for more than 1 minute. Dry running
causes a build-up of energy in the pump, producing heat which can damage the
shaft, impeller, and mechanical seal.
• Never allow the pump to run without fluid.
• Do not operate the pump with the shut-off device in the suction line closed.
• Do not operate the pump for a longer period of time with the shut-off device in
the pressure pipe closed. This can cause the fluid to overheat.
The pump must run quietly and vibration-free at all times.
The rolling bearings must run quietly and vibration-free at all times.
Increased current consumption with unchanged operating conditions is a sign of bear-
ing damage. The bearing temperature may be up to 50°C above the ambient temper-
ature, but never rise above 80°C.
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Check the static gaskets and the shaft seal regularly for leakages.
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For pumps with mechanical seals, there is little to no visible leakage during opera-
tion. If a gasket is leaking significantly, this is a sign that the gasket surfaces are
worn. The gasket must be replaced. The service life of a mechanical seal greatly de-
pends on the operating conditions (temperature, pressure, fluid properties).
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Wilo recommends checking the flexible coupling elements regularly and replacing
them at the first sign of wear.
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Wilo recommends briefly operating the standby pumps at least once a week to en-
sure they are always ready for operation.
WILO SE 2020-10
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