Disturbance recovery
8 Disturbance recovery
For faults which do not appear in the following table or faults
that cannot be traced back to the suggested causes, please
consult with the manufacturer.
Possible faults are identified by a fault number in the below
table. This number points to the respective cause and remedy
in the troubleshooting list.
Fault Number
Pump not pumping 1
Pumping rate insufficient
2
Pumping rate excessive 3
Pumping pressure insufficient
4
Pumping pressure excessive
5
Pump running roughly 6
Roller bearing temperatures too high
7
Pump leaking 8
Motor power uptake exce ssive 9
Tab. 12 Fault/number assignment
Fault number
12 34
5
6
7
89
Cause
Remedy
X
––– –––––
Supply/suction line and/or pressure line
closed by armature
Open the armature.
–
X
–
X
–––––
Supply/suction pipe not fully opened
Open the armature.
XX
–
X
–
X
–––
Supply/suction pipe, pump or suction
screen blocked or encrusted
Clean supply/suction pipes, pump or
suction screen.
–
X
–
X
–
X
–––
Supply/suction pipe cross-section too
narrow
Increase cross-section.
Remove encrustations from suction
pipe.
Open the armature completely.
X
––– –––––
Transport and sealing cover still in place Remove transport and sealing cover.
Disassemble pump and inspect for
dry-running damage.
–
X
–
X
–
X
–––
Differential head excessive: NPSH
pump
larger than NPSH
installation
Increase supply pressure.
Consult with manufacturer.
X
––––
X
–––
Supply/suction pipe and pump not bled
properly or not filled up completely
Fill up pump and/or piping completely
and bleed them.
X
––––
X
–––
Supply/suction line contains air enclosures
Mount armature for bleeding.
Correct the piping layout.
XX
–
X
–
X
–––
Air sucked in
Seal the source of malfunction.
XX
–
X
–
X
–––
Excessive amount of gas: pump cavitated
Consult with manufacturer.
–
X
–
X
–
X
–––
Pumped medium tem perature too high:
pump cavitated
Increase supply pressure.
Lower the temperature.
Inquire with manufacturer.
EN – 02 BA-2005.07 NPC series 31
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