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Leakage sensor in the
motor
Float switch
(mechanical seal leakage)
Bearing temperature sensor Table 12: Resistance measurement of the bearing temperature sensor
52 of 112
7 Servicing/Maintenance
If the specified tolerances are exceeded, disconnect the power cable at the pump set
and repeat the check inside the motor.
If the tolerances are exceeded here, too, the motor section has to be opened and
overhauled. The temperature sensors are fitted in the stator winding and cannot be
replaced.
If the sensors are defective, use the back-up sensors provided at the same place in the
stator winding.
Table 10: Resistance measurement of the leakage sensor in the motor
Measurement between terminals ...
9 and earth conductor (PE)
Lower resistance values suggest water ingress into the motor. In this case the motor
section must be opened and serviced.
Table 11: Resistance measurement of the float switch
Measurement between terminals ...
3 and 4
If the readings suggest an open switch, check for mechanical seal leakage.
Measurement between terminals ...
15 and 16
16 and 17
If the measured value is within the permissible tolerance range after the tripping unit
of the temperature sensor tripped the pump, the rolling element bearings must be
checked and replaced, if required.
7.3 Removing the pump set
7.3.1 Removing the pump set
DANGER
Insufficient preparation of work on the pump (set)
Risk of injury!
▷ Properly shut down the pump set.
▷ Close the shut-off elements in the suction line and discharge line.
▷ Drain the pump and release the pump pressure.
▷ Shut off any auxiliary feed lines.
▷ Allow the pump set to cool down to ambient temperature.
WARNING
Incorrect handling of the electric cable
Personal injury and damage to property!
▷ Secure electric cables against falling down.
▷ Avoid electric cables being laid on surfaces without fastening.
▷ When moving the pump set keep at a safe distance to the electric cables.
Amacan P
Resistance
[kΩ]
> 60
Resistance
[Ω]
< 1
Resistance
[Ω]
100 to 120
100 to 120
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