Maintenance Tasks - Wilo -Rexa PRO V06DA-110/EAD1X2-T0015-540-O Einbau- Und Betriebsanleitung

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8.3 Maintenance tasks

8.3.1 Checking the insulation resistance
To check the insulation resistance, the power supply
cable must be disconnected. The resistance can then
be measured with an insulation tester (measuring volt-
age = 1,000 V). The following values may not be
exceeded:
• For the initial start-up: Minimum insulation resis-
tance 20 M:.
• For further measurements: Value must be greater
than 2 M:.
For motors with an integrated capacitor, the
windings must be short-circuited before check-
ing.
If the insulation resistance is too low, moisture
may have penetrated the cable and/or the motor.
Do not connect the machine, consult manufac-
turer.
8.3.2 Monitoring the current consumption and voltage
The current consumption and voltage is to be moni-
tored periodically during all 3 phases. This remains con-
stant during normal operation. Slight fluctuations are a
result of the composition of the pumped fluid. The
current consumption can assist in early detection and
correction of damage and/or faulty operation in the
impeller, bearings and/or the motor. More extensive
resulting damage can thus be largely prevented and the
risk of a total failure can be reduced.
8.3.3 Checking the switching devices/relays in use
Check that the switching devices/relays in use are
working properly. Defective devices must be replaced
immediately because they cannot guarantee safe
operation of the product. Details about the test proce-
dure can be found in the operating manual for the
switching device/relay.
8.3.4 Visual inspection of accessories
Check that accessories are fitted correctly and working
properly. Loose and/or defective accessories should be
repaired immediately or replaced.
8.3.5 Functional inspection of safety and control devices
Monitoring devices are temperature sensors in the
motor, sealing room monitors, motor protection relays,
overvoltage relays, etc.
Motor protection and overvoltage relays and other trip
elements can generally be triggered manually for test
purposes.
To inspect the sealing room monitor or the tempera-
ture sensor, the unit must be cooled to ambient tem-
perature and the electrical supply cable of the
monitoring device in the switch cabinet must be dis-
connected. The monitoring device is then tested with
an ohmmeter.
The following values should be measured:
• Bi-metal sensor: Value = "0"-throughput
46
• PTC sensor: A PTC sensor has a cold resistance of
between 20 and 100 ohms.
• For 3 sensors in series, this would result in a value of
between 60 and 300 ohms.
• For 4 sensors in series, this would result in a value of
between 80 and 400 ohms.
• PT 100 sensor: PT 100 sensors have a value of
100 ohms at 32 °F (0 °C). Between 32 °F (0 °C) and
212 °F (100 °C), this value increases by 0.385 ohms per
1°C. This gives a value of 107.7 ohms at an ambient
temperature of 68 °F (20 °C).
• Moisture sensor: This value must go towards infinity. If
there is a low value, there is water in the oil. Also
observe the instructions of the optionally available
evaluation relay.
In the case of larger deviations, please consult
the manufacturer!
8.3.6 Visual inspection of the power supply cable
The power supply line must be examined for bubbles,
cracks, scratches, chafed areas and/or crushed sec-
tions. If damage is found, the power cable must be
exchanged immediately.
The cables may only be changed by Wilo cus-
tomer service or an authorized/certified service
workshop. The product may not be used again
until the damage has been rectified correctly!
8.3.7 Turning the impeller
1 Lay the unit horizontally on a firm surface.
Make sure that the unit cannot fall over and/or
slip away.
2 Reach into the hydraulic housing below and turn the
impeller.
Beware of sharp edges!
Sharp edges can form on the impellers and
hydraulic opening. There is a risk of injuries! Wear
protective gloves.
8.3.8 Checking the oil level in the oil separation chamber
Fig. 7: Plugs
1 Plug
1 Lay the unit horizontally on a firm surface with the plug
facing upwards.
Make sure that the unit cannot fall over and/or
slip away.
2 Slowly and carefully remove the plug.
Caution: The lubricant may be pressurized.
3 The lubricant must reach to about 1 cm (0.4 in) below
the plug opening.
4 If there is not enough oil in the oil separation chamber,
top it up. When doing so, follow the instructions under
"Changing the oil".
5 Clean the plug, fit with a new sealing ring if necessary
and screw it in again.
WILO SE 10/2011 V4.1WE