Troubleshooting
8
Troubleshooting
DANGER
Risk of death and material damage due to magnetic
fi
eld!
Make sure that personnel who have a pacemaker do not
perform any work on the pump.
Secure the work area. If necessary isolate the area:
–
Make sure that personnel with pacemakers keep a safe
distance of at least 1 m.
–
Make sure that no magnetizable metal parts can be
attracted by the magnetic coupling of the pump.
–
Make sure that parts of the magnetic coupling cannot
be attracted by the magnetizable metal parts.
Keep all magnetic-sensitive objects at a safe distance of at
least 150 mm from the magnetic coupling.
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 identi
fi
ed by a fault number in the table
below. This number identi
fi
es the respective cause and rem-
edy in the troubleshooting list.
Fault
Number
Pump not pumping
1
Pumping rate insuf
fi
cient
2
Pumping rate excessive
3
Pumping pressure insuf
fi
cient
4
Pumping pressure excessive
5
Pump running roughly
6
Antifriction bearing temperatures too high
7
Pump leaking
8
Motor power uptake excessive
9
Tab. 12
Fault number assignment
Fault number
1
2
3
4
5
6
7
8
9
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.
X
X
–
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.
32
CNH-ML series
BA-2017.02 en-US
160-276/0 – 550 406
