7 Servicing/Maintenance
54 of 126
Amacan K
1579.807/07-EN
7.2.1.2 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.
Temperature sensors in the
motor winding
Table 10:
Resistance measurement
Measurement between terminals ...
Resistance
[Ω]
21 and 22
< 1
10 and 11
200 to 1000
31 and 32
4)
100 to 120
33 and 34
4)
100 to 120
35 and 36
4)
100 to 120
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.
Leakage sensors in the
motor
Table 11:
Resistance measurement of the leakage sensor in the motor
Measurement between terminals ...
Resistance
[kΩ]
9 and earth conductor (PE)
> 60
8 and 9
5)
> 60
Lower resistance values suggest water ingress into the motor. In this case the motor
section must be opened and overhauled.
Float switch
(mechanical seal leakage)
Table 12:
Resistance measurement of the float switch
Measurement between terminals ...
Resistance
[Ω]
3 and 4
< 1
If the readings suggest an open switch, check for mechanical seal leakage.
Bearing temperature sensor Table 13:
Resistance measurement of the bearing temperature sensor
Measurement between terminals ...
Resistance
[Ω]
15 and 16
100 to 120
16 and 17
6)
100 to 120
Vibration sensor Table 14:
Current measurement at vibration sensor
Measurement between terminals ...
Current value
41 and 42
7)
Constant 4 mA during standstill
4
Optional
5
Only for pump sets with vibration sensor
6
Optional
7
Optional
