General Overhaul; Faults, Causes And Remedies - Wilo Rexa UNI Instrucciones De Instalación Y Funcionamiento

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7. Pour in operating fluid: Rotate the pump until the open-
ing points upwards. Fill-in the operating fluid into the
opening.
⇒ Comply with the specifications for operating fluid
locations and quantity!
8. Clean the screw plug, replace the seal ring and screw it
back in. Max. tightening torque: 8 Nm (5.9 ft lb)!
9.5.7

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 re-
placed with original parts. This will ensure correct opera-
tion.
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 hazard-
ous to health! Wear the following protective equip-
ment while performing the work:
• Closed safety goggles
• Breathing mask
• Protective gloves
⇒ The equipment listed here is the minimum re-
quirement, observe the specifications 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.
DANGER
Risk of fatal injury due to dangerous lone
working practices!
Work in chambers and narrow rooms as well as work
involving risk of falling are dangerous work. Such
work may not be carried out autonomously! A second
person must be present for safety reasons.
54
Faults, causes and remedies
WARNING
No persons are allowed to be present inside
the working area of the pump!
Persons may suffer (serious) injuries while the pump is
in operation! No persons may therefore be present in-
side the working area. If persons must enter the
working area of the pump, the pump must be decom-
missioned and secured against being switched on
again without authorisation.
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction
port. There is danger of limbs being severed! Protect-
ive gloves must be worn to protect from cuts.
Fault: Pump does not start
1. Electricity supply interrupted or short-circuit/earth fault
in the cable or motor winding.
⇒ Have the connection and motor checked by a quali-
fied electrician and replace if necessary.
2. Tripping of fuses, of the motor protection switch or the
monitoring equipment
⇒ Have the connection and the monitoring equipment
checked by a qualified electrician and change it if
necessary.
⇒ Have the motor protection switches and fuses in-
stalled and adjusted according to the technical spe-
cifications by a qualified electrician and reset monit-
oring equipment.
⇒ Check the impeller to make sure that it runs
smoothly, clean the hydraulics if necessary.
Fault: Pump starts up, motor protection trips after
short period
1. Motor protection switch set incorrectly.
⇒ Have the adjustment of the trigger checked and
corrected by a qualified electrician.
2. Increased power consumption due to major voltage drop.
⇒ Have the voltage of individual phases checked by a
qualified electrician. Contact the electricity distribu-
tion network.
3. There are only two phases at the connection.
⇒ Have the connection checked and corrected by a
qualified electrician.
4. Excessive differences in voltage between the phases.
WILO SE 2019-02