KSB Amarex N series, Installation And Operating Manual

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7 Servicing/Maintenance
44 of 84
Amarex N
2563.84/08-EN
7.2 Maintenance/inspection
KSB recommends the following regular servicing schedule:
Table 16: Overview of maintenance work
Maintenance interval Maintenance work For details see ...
Every 4000 operating hours; at
least once a year Insulation resistance measurement (
ð
Section 7.2.1.3, Page 44)
Checking the power cables ( ð Section 7.2.1.2, Page 44)
Visual inspection of the lifting chain /
lifting rope ( ð Section 7.2.1.1, Page 44)
Checking the sensors (
ð
Section 7.2.1.4, Page 45)
Changing the lubricant
Checking the bearings
Every 5 years General overhaul
7.2.1 Inspection work
7.2.1.1 Checking the lifting chain/rope
ü The pump set has been lifted out of the pump sump and cleaned. (Applies to
installation type K only.)
1. Inspect the lifting chain/rope as well as their fasteners for any visible damage.
2. Replace any damaged components by original spare parts.
7.2.1.2 Checking the power cables
Visual inspection ü The pump set has been lifted out of the pump sump and cleaned.
1. Inspect the power cables for visible damage.
2. Replace any damaged components by original spare parts.
Checking the earth
conductor
ü The pump set has been lifted out of the pump sump and cleaned.
1. Measure the resistance between the earth conductor and chassis ground.
The electrical resistance must be lower than 1 Ω.
2. Replace any damaged components by original spare parts.
DANGER
Defective earth conductor
Electric shock!
▷ Never switch on a pump set with a defective earth conductor.
7.2.1.3 Measuring the insulation resistance
Measure the insulation resistance of the motor winding during annual maintenance
work.
ü The pump set has been disconnected in the control cabinet.
ü
Use an insulation resistance measuring device.
ü The recommended measuring voltage equals 500 V (maximum permissible
1000 V).
1. Measure the winding to chassis ground.
To do so, connect all winding ends together.
2. Measure the winding temperature sensors to chassis ground.
To do so, connect all core ends of the winding temperature sensors together
and connect all winding ends to chassis ground.