Wilo FKT 50.1 Instrucciones De Instalación Y Funcionamiento página 198

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9.6.3 Visual inspection of accessories
9.6.4 Visual inspection of coatings and
housing for wear
9.6.5 Function test of the monitoring
device
9.6.5.1 Test the resistor of the temper-
ature sensor
9.6.5.2 Test the resistor of the internal
electrodes for monitoring the ter-
minal room, motor compartment
and sealing chamber
9.6.5.3 Testing the resistor of the ex-
ternal electrode for sealing cham-
ber control
9.6.6 Note for the use of shut-off ball
cocks
198
Maintenance and repair
▪ Scratches
▪ Abrasion
▪ 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.
Accessories must be checked for:
▪ Correct fixation
▪ Smooth function
▪ Signs of wear, e.g. cracks caused by frequencies
Any defects detected must be repaired immediately or the accessories must be re-
placed.
The coatings and housing parts must not show any signs of damage. If there are de-
fects, the following must be observed:
▪ If the coating is damaged, it must be restored.
▪ Contact customer service if housing parts have worn out!
To test resistances, the pump must be cooled down to the ambient temperature!
Measure the resistor of the temperature sensors with an ohmmeter. The following
measured values must be complied with:
▪ Bimetallic strip: Measured value = 0 ohms (continuity).
▪ PTC sensor (PTC thermistor): Measured value depends on the number of sensors in-
stalled. A PTC sensor has a cold resistance range of 20 to 100 ohms.
– With three sensors in series, the measured value range is from 60 to 300 ohms.
– With four sensors in series, the measured value range is from 80 to 400 ohms.
▪ 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) increase.
At an ambient temperature of 20 °C (68 °F), the resistance is 107.7 ohms.
The internal electrodes are switched in parallel. During testing, all the electrodes are
thus measured together.
Motor FKT 50.1, 57 and 63.1
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!
Motor FKT 63.2
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!
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, if there is water in the oil – change the oil!
If shut-off ball cocks are installed on the drain holes, observe the following points:
▪ Remove the screw plug before opening the shut-off ball cock.
▪ To drain the operating fluid, turn the lever to the direction of flow (parallel to the shut-
off ball cock).
▪ To close the drain hole, turn the lever so it is at right angles to the direction of flow (to
the shut-off ball cock).
▪ After closing the shut-off ball cock, screw in the screw plug again.
WILO SE 2019-01