KSB Etachrom NC, Инструкция по установке и эксплуатации

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8 Trouble-shooting
WARNING
Improper remedial work on the pump (set)
Risk of injury!
▷
For any work performed in order to remedy faults on the pump (set) observe
the relevant information given in this operating manual or the product
literature provided by the accessories manufacturers.
If problems occur that are not described in the following table, consultation with
KSB’s customer service is required.
Pump delivers insufficient flow rate
Motor is overloaded
Excessive pump discharge pressure
Increased bearing temperature
Leakage at the pump
Excessive leakage at the shaft seal
Vibrations during pump operation
Impermissible rise of temperature inside the pump
Table 19: Trouble-shooting
A B C D E F G H Possible cause Remedy 7)
✘
Pump delivers against an excessively high
pressure. Re-adjust to duty point.
Check system for impurities.
Fit a larger impeller.
8)
Increase the speed (turbine, I.C. engine).
✘ ✘ ✘
Pump and/or piping are not completely
vented or primed. Vent and/or prime.
✘
Supply line or impeller clogged Remove deposits in the pump and/or piping.
✘
Formation of air pockets in the piping Alter piping layout.
Fit vent valve.
✘ ✘ ✘
Suction lift is too high/NPSH
available
(positive
suction head) is too low.
Check/alter fluid level.
Install pump at a lower level.
Fully open the shut-off element in the suction
line.
Change suction line, if the friction losses in the
suction line are too high.
Check any strainers installed/suction opening.
Observe permissible speed of pressure fall.
✘
Air intake at the shaft seal. Fit new shaft seal.
✘
Wrong direction of rotation Check the electrical connection of the motor and
the control system, if any.
✘
Speed is too low.
8)
- Operation with frequency inverter
- Operation without frequency inverter
- Increase voltage/frequency at the frequency
inverter in the permissible range.
- Check voltage.
✘ ✘
Wear of internal components Replace worn components by new ones.
✘ ✘
Pump back pressure is lower than specified
in the purchase order. Adjust duty point accurately.
In the case of persistent overloading, turn down
impeller.
8)
✘
Density or viscosity of fluid handled higher
than stated in purchase order Contact KSB.
✘
Use of unsuitable shaft seal materials
Change the material combination.
8)
✘ ✘
Speed is too high. Reduce speed. 8)
A
B
C
D
E
F
G
H
7)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8) Contact KSB.
8 Trouble-shooting
Etachrom NC 53 of 62