KSB Amacan K, Installation & Operating Manual

Page: 53 / 126

7 Servicing/Maintenance
53 of 126
Amacan K
1579.807/07-EN
7.2 Maintenance/inspection
KSB recommends the following regular maintenance schedule:
Table 9: Overview of maintenance work
Maintenance interval Servicing/maintenance work For details see ...
Every 4000 hours,
at least
once a year Measuring the insulation
resistance (
ð
Section 7.2.1.1, Page 53)
Every 8000 hours,
at least
every 2 years Checking the cable bundle ( ð Section 7.3.3, Page 57)
Checking the earth conductor ( ð Section 7.3.4, Page 57)
Checking the sensors ( ð Section 7.2.1.2, Page 54)
Checking the mechanical seal
leakage ( ð Section 7.3.5, Page 57)
Changing the lubricant ( ð Section 7.4, Page 58)
Every 5 years General overhaul
On pump sets with sacrificial anodes, the sacrificial anodes must initially be checked
after 6 months. If necessary, the sacrificial anodes must be replaced. If the sacrificial
anodes show little wear, the maintenance interval can be extended to 12 months.
7.2.1 Inspection work
7.2.1.1 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.
ð The insulation resistance of the core ends to chassis ground must not be lower
than 1 MΩ.
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 1 MΩ, 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.