Maintenance and repair
en
Installation and operating instructions Wilo Motor T 12 ... 72 + EMU FA, Rexa SUPRA, Rexa SOLID
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WARNING
Hand, foot or eye injuries due to the absence of protective equipment!
Danger of (serious) injuries during work. Wear the following protective equipment:
• Safety gloves for protection against cuts
• Safety shoes
• Closed safety goggles
The following pre-requisites must be fulfilled prior to starting maintenance measures:
ƒ
Pump cooled down to the ambient temperature.
ƒ
Pump cleaned thoroughly and disinfected (if required).
9.6.1
Visual inspection of the connec-
tion cable
Check connection cable for:
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Bubbles
ƒ
Cracks
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Scratches
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Abrasion
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Pinch points
If damage is identified on the connection cable, decommission the pump immediately!
Have the connection cable replaced by Wilo customer service. Only operate the pump
up again once the damage has been properly remedied!
CAUTION! Water may penetrate into the pump due to the damaged connection
cable! Water ingress leads to total failure of the pump.
9.6.2
Visual inspection of accessories
Accessories must be checked for:
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Correct fixation
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Smooth function
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Signs of wear, e.g. cracks caused by frequencies
Any defects detected must be repaired immediately or the accessories must be re-
placed.
9.6.3
Visual inspection of coatings and
housing for wear
The coatings and housing parts must not show any signs of damage. If there are de-
fects, the following must be observed:
ƒ
If the coating is damaged, it must be restored.
ƒ
Contact customer service if housing parts have worn out!
9.6.4
Function test of the monitoring
device
The mixer must be cooled down to ambient temperature to test resistances!
9.6.4.1
Test the resistor of the internal
electrodes for motor compart-
ment monitoring
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.
Con-
tact customer service!
9.6.4.2
Test the resistor for the internal
electrodes for terminal room/mo-
tor compartment monitoring
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
compartment.
Contact customer service!
9.6.4.3
Test the resistor of the internal
electrodes for monitoring the ter-
minal room, motor compartment
and sealing chamber
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 com-
partment or sealing chamber. Change the oil in the sealing chamber and measure again.
NOTICE! If the value is still ≤ 30 kOhm, contact customer service!
9.6.4.4
Test the resistor of the temper-
ature sensor
Measure the resistor of the temperature sensors with an ohmmeter. The following
measured values must be complied with:
ƒ
Bimetallic strip
: Measured value = 0 ohms (continuity).
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