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9.6.4
Function test of the monitoring
devices
9.6.4.1
Test the resistor of the internal
electrodes for motor compart-
ment monitoring
9.6.4.2
Test the resistor for the internal
electrodes for terminal room/mo-
tor compartment monitoring
9.6.4.3
Test the resistor of the internal
electrodes for monitoring the ter-
minal room, motor compartment
and sealing chamber
9.6.4.4
Checking resistor in the tempera-
ture sensor
9.6.4.5
Testing the resistor of the exter-
nal electrode for sealing chamber
control
9.6.5
Oil change in sealing chamber
Installation and operating instructions Wilo Motor T 12 ... 72 + EMU FA, Rexa SUPRA, Rexa SOLID
Maintenance and repair
▪ Contact customer service if housing components are worn!
The mixer must be cooled down to ambient temperature to test resistances!
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, there is water in the motor compartment. Contact
customer service!
The internal electrodes are switched in parallel. During testing, all the electrodes are thus
measured together.
Measure the resistor of the electrodes with an ohmmeter. The measured value must ap-
proach "infinity". At values ≤ 30 kOhm, there is water in the terminal room or motor com-
partment. Contact customer service!
The internal electrodes are switched in parallel. During testing, all the electrodes are thus
measured together.
Measure the resistor of the electrodes with an ohmmeter. The measured value must ap-
proach "infinity". At values ≤ 30 kOhm, there is water in the terminal room, motor compart-
ment or sealing chamber. Change the oil in the sealing chamber and measure again.
NOTICE! If the value is still ≤ 30 kOhm, contact customer service!
Check the resistor in the temperature sensor with an ohmmeter. The following measured
values must be complied with:
▪ Bimetallic strip: Measured value = 0 Ohm (passage).
▪ PTC sensor (positive temperature coefficient thermistor): Measured value depends on the
number of sensors installed. A PTC sensor has a cold resistance of between 20 and
100 Ohm.
– With three sensors in series, the measured value is between 60 and 300 Ohm.
– With four sensors in series, the measured value is between 80 and 400 Ohm.
▪ Pt100 sensor: Pt100 sensors have a resistance value of 100 ohms at 0 °C (32 °F). Between
0 °C (32 °F) and 100 °C (212 °F), the resistance increases by 0.385 ohms per 1 °C (1.8 °F) in-
crease.
At an ambient temperature of 20 °C (68 °F), the resistance is 107.7 ohms.
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, there is water in the oil – change the oil!
WARNING
Operating fluid under high pressure!
A pressure of several bar can build up inside the motor! This pressure escapes when
opening the screw plugs. Screw plugs opened carelessly can be ejected at high speed! To
avoid injuries, observe the following instructions:
• Adhere to the prescribed sequence of work steps.
• Unscrew screw plugs slowly but never fully. As soon as the pressure escapes (audible
whistling or hissing of air), do not turn any further!
• When the pressure has fully dissipated, fully unscrew screw plugs.
• Wear closed safety goggles.
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