Troubleshooting And Possible Solutions - Wilo RexaBloc RE Notice De Montage Et De Mise En Service

TROUBLESHOOTING AND POSSIBLE SOLUTIONS
13. Slide the rubber bellows with spring (14) onto the
shaft (10), turning it slightly clockwise, until it
is completely in contact with the stationary ring
(15).
Caution!
Avoid tilting! For longer distances, remoisten
frequently. Only apply force to the last turn of
the spring.
14. Insert the key (11) again.
15. Install the impeller – see section "Impeller
change"
8.4.5. Change of hydraulics
To change the hydraulics, proceed as described
in the "Removal" chapter. To do so, remove the
"back pull out" unit and then replace the hydrau-
lics housing in the piping.
8.4.6. Change of motor
The system is driven as standard by IEC standard
motors. These can be replaced at any time. See
the type designation for the size; the B5 motor
construction is used.
Fig. 8: Removal of the motor
1 Standard motor
2 Hexagon nuts for fixation of the motor
3 Hexagon head screws for fixation of the motor
1. Fasten the lifting equipment to the marked at-
tachment points.
2. Undo and remove hexagon nuts.
3. Press the hexagon head screws out of the flange.
4. Carefully pull the motor off the hydraulic flange.
5. Place a new motor on the hydraulic flange.
Pay attention to the sliding surfaces of the mo-
tor shaft.
6. Insert hexagon head screws into the flange.
7. Attach hexagon nuts with washers to the hexa-
gon head screws and screw them tight.

9. Troubleshooting and possible solutions

In order to prevent damage or serious injury while
rectifying hydraulics faults, the following points
must be observed:
• Only attempt to rectify a fault if you have quali-
fied staff. This means that each job must be car-
ried out by trained specialist staff. For example,
electrical work must be performed by a trained
electrician.
• Always secure the hydraulics against an acciden-
tal restart by disconnecting them from the mains.
Take appropriate safety precautions.
• Always have a second person on hand to ensure
the hydraulics is switched off in an emergency.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the hydraulics are made
at the operator's own risk and release the manu-
facturer from any warranty obligations.
Installation and operating instructions Wilo-RexaBloc RE
Fault: The unit will not start
1. Fuses, the motor protection switch and/or moni-
toring devices are triggered
• Check that the impeller runs freely. If necessary
clean it and ensure it runs freely again
2. The sealing chamber control (optional) has inter-
rupted the power circuit (operator-related)
• See fault: Mechanical shaft seal leak, sealing
chamber control reports a fault or shuts down
the unit
Fault: The unit starts, but the motor protection
switch triggers shortly after commissioning
1. Incorrect direction of rotation
• Swap the 2 phases of the mains supply
2. Impeller slowed by accumulation, clogging and/or
solid matter, increased current consumption
• Switch off the hydraulics, secure them against
being switched back on again and free the
impeller or clear the suction port
3. The fluid is too dense
• Contact Wilo customer service
Fault: Unit is running but not pumping
1. No fluid available
• Open inlet for tank or slide valve
2. Intake blocked
• Clean the supply line, slide valve, suction piece,
suction port or suction strainer
3. Impeller blocked or slowed
• Switch off the hydraulics, secure them against
being switched back on again and free the
impeller
4. Defective piping
• Replace defective parts
5. Intermittent operation
• Check switching system
Fault: The unit runs, but not within the specified
operating parameters
1. Intake blocked
• Clean the supply line, slide valve, suction piece,
suction port or suction strainer
2. Slide valve in the pressure pipe closed
• Fully open the slide valve
3. Impeller blocked or slowed
• Switch off the hydraulics, secure them against
being switched back on again and free the
impeller
4. Incorrect direction of rotation
• Replace two phases on the mains supply
5. Air in the system
• Check the piping and hydraulics, and vent if
necessary
6. Hydraulics pumping against excessive pressure
• Check the slide valve in the pressure pipe and
open it completely if necessary, use a different
impeller, consult the plant
7. Signs of wear
• Replace worn parts
8. Defective piping
• Replace defective parts
9. Inadmissible levels of gas in the fluid
• Consult the plant
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