7 Servicing/Maintenance
45 of 82
Amarex
2573.820/02-EN
ð The insulation resistance of the core ends to chassis ground must not be lower
than 1MΩ.
If the resistance measured is lower, power cable and motor resistance must be
measured separately. Disconnect the power cable from the motor for this
purpose.
NOTE
If the insulation resistance of the power cable is lower than 1MΩ, the power cable
is defective and must be replaced.
NOTE
If the insulation resistances measured on the motor are too low, the winding
insulation is defective. The pump set must not be returned to service in this case.
7.2.1.4 Checking the sensors
CAUTION
Excessive test voltage
Damage to the sensors!
▷ Use a commercially available ohmmeter to measure the resistance.
The tests described below measure the resistance at the core ends of the control
cable. The actual sensor function is not tested.
Bimetal switch in the motor Table18: Resistance measurement of bimetal switch in the motor
Measurement between terminals ... Resistance
[Ω]
20 and 21 < 1
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.
Leakage sensor in the
motor
Table19: Resistance measurement of the leakage sensor in the motor
Measurement between terminals ... Resistance
[kΩ]
9 and earth conductor (PE) > 60
Lower resistance values suggest water ingress into the motor. In this case the motor
section must be opened and serviced.
7.2.2 Lubrication and lubricant change
7.2.2.1 Lubricating the mechanical seal
The mechanical seal is supplied with lubricating liquid from the lubricant reservoir.
7.2.2.1.1 Intervals
Change the lubricant every 4000 operating hours but at least once a year.
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