Allweiler NIT Series - Troubleshooting

Troubleshooting
8 Troubleshooting
For faults which are not specified in the following table or can-
not be traced back to the specified causes, please consult the
manufacturer.
Possible faults a re identified by a fault number in the table
below. This number identifies the respective cause a nd rem-
edy in the troubleshooting list.
Fault Number
Pump not p umpi ng 1
Pumpingrateinsufficient
2
Pumping rate excessive 3
Pumping pressure insufficient
4
Pumping pressure excessive
5
Pump running roughly 6
Pump leaking
7
Motor power uptake excessive 8
Tab. 12 Fault number assignment
Fault number
12 34
5
6
7
8
Cause
Remedy
X
––– ––––
Supply/suction pipe and/or pressure pipe
closed by armature
Open the armature.
–
X
–
X
––––
Supply/suction pip e not fully opened
Open the armature.
XX
–– –
X
––
Stub shaft loose
Tighten the stub shaft firmly
(→ 7.4 Installing, Page 26).
XX
–
X
–
X
––
Supply/suction pipe, pump or suction
strainer blocked or encrusted
Clean the supply/suction pipe, pump or
suction strainer.
–
X
–
X
–
X
––
Supply/suction pipe cross-section too
narrow
Increase the cross-section.
Re
move any encrustations from the
suction pipe.
Open the armature completely.
X
––– ––––
Transport and sealing cove r still in place Remove the transport and sealing cover.
Dism
ount the pump and inspect it for
dr
y-running damage.
–
X
–
X
–
X
––
Differential head excessive:
NPSH
pump
larger than NPSH
system
Increase the supply pressure.
Consult the manufacturer.
X
––– –
X
––
Supply/suction pipe not bled properly or not
filled up completely
Fill u p the pump and/or piping completely
and bleed them.
X
––– –
X
––
Supply/suction pipe contai ns air pockets
Install the armature for bleeding.
Correct the piping layout.
XX
–
X
–
X
––
Air is sucked in
Seal the source of malfunction.
XX
–
X
–
X
––
Excessive a m ount of gas: pump is
cavitating
Consult the manufacturer.
–
X
–
X
–
X
––
Pumped medium temperature too h igh :
pump is cavitating
Increase the supply pressure.
Lower the temperature.
Consult the manufacturer.
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