Installation and operating instructions Wilo-Rexa PRO 29
TROUBLESHOOTING
US English
8.3.1.
Visual inspection of the power supply cable
The power supply cables must be checked for
blisters, cracks, scratches, abrasion and/or crushing.
If any damage is detected, the pump must be de-
commissioned immediately and the damaged power
supply cable must be replaced.
The cables may only be replaced by Wilo cus-
tomer service or an authorized or certified service
workshop. The pump may only be started up again
once the damage has been properly remedied.
8.3.2.
Visual inspection of accessories
Accessories must be checked to ensure they are
properly fitted and function correctly. Loose and/
or faulty accessories must be repaired or replaced
immediately.
8.3.3.
Visual inspection of coating and housing for wear
The coatings and housing parts must not show any
signs of damage. If there is visible damage to the
coatings, repair the coating accordingly. If there
is visible damage to housing parts, contact Wilo
customer service.
8.3.4. Functional inspection of safety and monitoring
devices
Monitoring devices include the temperature sensors
in the motor, humidity electrodes, overload relay,
overvoltage relay, etc.
• Motor protection and overvoltage relays and other
triggers can usually be triggered manually for test
purposes.
• To check the pencil electrode or the temperature
sensor, the pump has to be cooled to the ambient
temperature and the electrical connection for the
monitoring equipment has to be disconnected in
the switchgear. The monitoring equipment can then
be checked with an ohmmeter. The values mea-
sured should be as follows:
•
Bimetallic strip: Value = “0” passage
•
PTC thermistor sensor: A PTC thermistor sensor
has a cold resistance of between 20 and 100 Ω.
If there are 3 sensors in series, this results in a
value of 60 to 300 Ω.
If there are 4 sensors in series, this results in a
value of 80 to 400 Ω.
•
Pencil electrode: This value must approach infin
-
ity. If the value is low, there is water in the oil. Also
observe the instructions of the optional evalua-
tion relay.
If there are relatively large deviations, consult the
manufacturer.
8.3.5.
Inspection of the switchgear/relays used
See the relevant installation and operating instruc-
tions for a description of the individual work steps
for inspecting the switchgear/relays. Faulty devices
must be replaced immediately as they provide no
protection to the pump.
8.3.6. Oil change in sealing chamber
The sealing chamber has a hole for draining and fill
-
ing the chamber.
WARNING:
risk of injury from hot and/or pres
-
surized oil!
After the pump is switched off, the oil is still hot
and pressurized. This can cause the screw plug
to be ejected and hot oil to escape. There is a
risk of injury or burns! First allow the oil to cool
down to ambient temperature.
Fig. 9.: 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 seal 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.
Содержание Rexa PRO Series
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