Xylem Flygt 5520, Installation, Operation And Maintenance Manual

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Service item Action
Cable
1. If the outer jacket is damaged, replace the cable.
2. Check that the cables do not have any sharp bends and are not
pinched.
Connection to power Check that the connections are properly tightened.
Electrical cabinets Check that they are clean and dry.
Impeller
1. Check the impeller clearance.
2. Adjust the impeller, if necessary.
Stator housing
1. Drain all liquid, if any.
2. Check the resistance of the leakage sensor.
Normal value approx.1500 ohms, alarm approx. 430 ohms.
Insulation Use a megger maximum 1000 V.
1. Check that the resistance between the earth (ground) and
phase lead is more than 5 megohms.
2. Conduct a phase-to-phase resistance check.
Junction box Check that it is clean and dry.
Level regulators Check the condition and functionality.
Lifting device Check that local safety regulations are followed.
Lifting handle
1. Check the screws.
2. Check the condition of the lifting handle.
3. Replace if necessary.
O-rings
1. Replace the oil plug O-rings.
2. Replace the O-rings at the entrance or junction cover.
3. Grease the new O-rings.
Overload protection and other
protections
Check the correct settings.
Personnel safety devices Check the guard rails, covers, and other protections.
Rotation direction Check the impeller rotation.
Oil housing Fill with new oil, if necessary.
Terminal block/closed end splice Check that the connections are properly tightened.
Thermal contacts Normally closed circuit; interval 0–1 ohm.
Voltage and amperage Check the running values.
Major overhaul
For a major overhaul, take this action in addition to the tasks listed under Inspection.
Service item Action
Support and main bearing Replace the bearings with new bearings.
Mechanical seal Replace with new seal units.
Maintenance
Flygt 5520 Installation, Operation, and Maintenance Manual 37