Owner manual

Operating instructions
WTS 102/3-en 16
9. Air pocket in pipeline
• vent
• improve course of pipe
10. NPSH of system too small
increase liquid level
11. Air being sucked in
• increase liquid level
12. Direction of rotation is wrong
• swap over two phases of power supply (to be done by a specialist electrician)
13. Inner components suffering from wear
• replace worn parts
14. Density and/or viscosity of liquid handled is too high
• seek assistance
15. Impeller out of balance
• remove blocks/deposits
• replace if broken or unevenly worn
• check shafts to ensure that they are running true
16. Coupling distance too small
• change
17. Forces in pipeline too high (pump unit under strain)
change (support pipes, use compensators, etc.)
18. Too much, too little or the wrong type of lubricant
• change
19. Electricity supply not right
• check voltage of all phases (2-phase running)
• check cable connections
• check fuses
20. Bearing damaged
• replace
• check lubricant and bearing space for pollutants (rinse oil area)
21. Discharge too small
• increase minimum amount carried (open slide valves, bypass)