Symptom | Cause | Remedy | ||
Not enough capacity | Liquid leaking back to suction over the | 21 | • | Check/correct assembly of the circulation pump |
| magnetic coupling |
|
| arrangement |
|
|
| • | Check/adjust axial clearance of the circulation |
|
|
|
| pump and rear face of the rotor |
Pump too noisy | Pump speed too high | 22 | • | Reduce pump speed. |
Vibrations |
|
|
| If necessary, install a larger pump. |
| Cavitation | 23 | • | Reduce difference between pump and suction |
|
|
|
| tank level. |
|
|
| • | Increase suction pipe diameter. |
|
|
| • | Reduce length and simplify suction pipe (use as |
|
|
|
| few elbows and other fittings as possible). |
|
|
|
| Also see section 3.18 Installation. |
| Backpressure too high | 24 | • | Increase pipe diameter. |
|
|
| • | Reduce working pressure. |
|
|
| • | Check accessories (filter, heat exchanger, etc.). |
| Coupling misalignment | 25 | • | Check and correct alignment. |
|
|
|
| Also see section 3.18 Installation. |
| Vibration of base plate or pipings | 26 | • | Make base plate heavier and/or affix baseplate/ |
|
|
|
| pipework better. |
| Ball bearings damaged or worn | 27 | • | Replace ball bearings. |
| 28 | • | Check/correct assembly of the outer magnetic | |
|
|
|
| rotor on the pump shaft |
|
|
| • | Check correct tightening of bolts, secure bolts |
|
|
|
| against loosening. |
Pump consumes | Pump speed too high | 29 | • | Reduce pump speed. |
too much power or |
|
|
| If necesary, install a larger pump. |
becomes hot | Coupling misalignment | 30 | • | Check and correct alignment. |
|
|
|
| Also see section 3.18 Installation. |
| Viscosity too high | 31 | • | Increase axial clearance. |
|
|
|
| See section 3.21 Maintenance instructions. |
|
|
| • | Heat pump. |
|
|
| • | Reduce pump speed. |
|
|
| • | Increase discharge pipe diameter. |
| Excessive friction losses inside rotor shaft | 32 | • | Check/correct axial clearance of circulation pump |
| / bearing arrangement |
|
| and rear face of the rotor |
|
|
| • | Check axial clearance of the plain bearing ar- |
|
|
|
| rangement replace bearing if necessary |
Rapid wear | Back pressure too high | 33 | • | Increase pipe diameter. |
|
|
| • | Reduce working pressure. |
|
|
| • | Check accessories (filter, heat exchanger, etc.) |
| Solid matter in liquid | 34 | • | Filter liquid. |
| Pump runs dry | 35 | • | Correct liquid supply. |
|
|
| • | Provide liquid level switch or dry running protec- |
|
|
|
| tion. |
|
|
| • | Heat up liquid. |
|
|
| • | Stop or reduce air sucking. |
| Corrosion | 36 | • | Change pump materials or application |
|
|
|
| parameters. |
Motor overloading | Back pressure too high | 37 | • | Increase pipe diameter. |
|
|
| • | Reduce working pressure. |
|
|
| • | Check accessories (filter, heat exchanger, etc.). |
| Viscosity too high | 38 | • | Increase axial clearance. |
|
|
|
| See section 3.21 Maintenance instructions. |
|
|
| • | Heat pump. |
|
|
| • | Reduce pump speed. |
|
|
| • | Increase discharge pipe diameter. |
| Excessive friction losses inside rotor shaft | 39 | • | Check/correct axial clearance of circulation pump |
| / bearing arrangement |
|
| and rear face of the rotor |
|
|
| • | Check axial axial clearance of the plain bearing |
|
|
|
| arrangement replace bearing if necessary |
| Rotor shaft runs against pump cover | 40 | • | Check axial axial clearance of the plain bearing |
|
|
|
| arrangement replace bearing if necessary |
42 | A.0500.551 – |
