SPX Cooling Technologies TG MAG86-100 Water Pump User Manual


 
42
A.0500.551 – IM-TGMAG/02.00 EN (02/2008)
Symptom Cause Remedy
Not enough capacity Liquid leaking back to suction over the
magnetic coupling
21 Check/correct assembly of the circulation pump
arrangement
Check/adjust axial clearance of the circulation
pump and rear face of the rotor
Pump too noisy
Vibrations
Pump speed too high 22 Reduce pump speed.
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.
Un-balance of the outer magnetic rotor 28 Check/correct assembly of the outer magnetic
rotor on the pump shaft
Check correct tightening of bolts, secure bolts
against loosening.
Pump consumes
too much power or
becomes hot
Pump speed too high 29 • Reduce pump speed.
If necesary, install a larger pump.
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
/ bearing arrangement
32 Check/correct axial clearance of circulation pump
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
/ bearing arrangement
39 Check/correct axial clearance of circulation pump
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