Troubleshooting - Wilo Rexa PRO Notice De Montage Et De Mise En Service

TROUBLESHOOTING

Fig. 8.: Screw plugs
1 Screw plug
1. Position the pump horizontally on a firm surface
with the screw plug facing upward.
Make sure that the pump cannot fall over and/or
slip.
2. Carefully and slowly unscrew the screw plug.
Attention: The oil may be pressurized! This can
cause the screw to be ejected at speed.
3. Empty out oil by rotating the pump until the hole
points downwards. Collect the oil in a suitable
container and dispose of it in accordance with the
requirements in the "Disposal" section.
4. Rotate the pump back until the hole is pointing
upwards again.
5. Pour the new oil in through the hole for the screw
plug. The oil should reach up to about 0.4 in (1 cm)
below the hole. Note the recommended oils and
filling quantities.
6. Clean the screw plug, replace the joint ring, and
screw it back in.
8.3.7. General overhaul
In a general overhaul, in addition to the normal
maintenance work, the motor bearings, shaft seals,
O-rings, and power supply cables are checked and
replaced if necessary. This work may be performed
only by the manufacturer or an authorized service
workshop.
9. Troubleshooting
In order to prevent damage or serious injury while
rectifying pump faults, the following points must be
observed:
• 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 pump against an accidental
restart by disconnecting it from the power supply.
Take appropriate safety precautions.
• Always have a second person on hand to ensure the
pump is switched off in an emergency.
• Secure moving parts to prevent injury.
• Unsanctioned changes to the pump are made at the
operator's own risk and release the manufacturer
from any warranty obligations.
Fault: the unit will not start
1. Electricity supply interrupted, short circuit or
ground fault in the cable or motor windings
• Have the motor and wires checked by a specialist
and replaced if necessary
Installation and operating instructions Wilo-Rexa PRO
2. Fuses, the motor protection switch, and/or monitor-
ing devices were triggered
• Have a specialist inspect the connections and
correct them as necessary.
• Have the motor protection switches and fuses
installed or adjusted according to the technical
specifications; reset the monitoring equipment.
• Check that the impeller runs freely. If necessary
clean it and ensure it runs freely again
3. The sealing chamber control (optional) has inter-
rupted the power circuit (depends on end user)
• See Fault: mechanical seal leak, sealing chamber
control reports a fault or switches the pump off
Fault: the unit starts, but the motor protection
switch triggers shortly after startup
1. The thermal trigger on the motor protection switch
is incorrectly set
• Have a specialist compare the setting of the trig-
ger with the technical specifications and correct it
as necessary
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 as necessary
5. Incorrect direction of rotation
• Swap two phases of the power supply
6. Impeller slowed by accumulation, clogging, and/or
solid matter; increased current consumption
• Switch off the pump, secure it against being
switched back on again, and free the impeller or
clear the suction port
7. The fluid is too dense
• Consult the manufacturer
Fault: unit is running but not pumping
1. No fluid available
• Open inlet for tank or slide valve
2. Inlet blocked
• Clean the supply line, slide valve, suction piece,
suction port, or suction strainer
3. Impeller blocked or slowed
• Switch off pump, secure it against being switched
back on again, and free the impeller
4. Faulty hose/piping
• Replace faulty 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
US English
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