IMP Pumps ECL - Handbuch (Seite 27)

-27-
GB
D) Disruptions
Insufficient flow of pump Overloading the electric motor Excessive outflow pressure Excessive temperature of bearings Excessive temperature of pump Insufficient level of medium Release of medium on the shaft seal Uneasy run of pump
Cause Measures
X
Pump operation under
excessive pressure (open
system)
Setting of operational point
(Q, H)
X
Excessive back pressure Increasing the number of
rotations
X X X
Air is not bled out of
pump, insufficiently filled
with medium
Bleed out the air and fill up the
system with medium
X Blocked inflow into pipes Remove deposits
X
Occurrence of air
cushion in the piping
system
Change pipes, install valve for
bleeding air
X X X
The pump is creating
resonant effects and
whirling in the piping
system
Checks connections to the piping
system and the fastening of the
pump; fasten the clamps on the
piping; install compensators into
the piping system
X X X
Insufficient NPSH of the
pump, excessive suction
height
Check the state of the medium;
open the lock in the inflow
pipe; change the inflow lead
in case of strong resistance;
check the suction opening
X
No centreline on shaft Coordinate the settings of the
vanes
X
No voltage on connectors
(frequency converter or
motor)
Check connectors and start the
voltage supply
X
Information on the
error is on the frequency
converter display
Call an authorised servicer or
serving operator
X
Air suction on
mechanical seal
Change mechanical seal
X
Wrong direction of pump
rotation
Change 2 phases on the
incoming electrical connection
X X
Operation on two phases Change the fuse; check the
incoming connections
X Damage to bearings Change the bearings
X X X
Insufficient flow of
medium
Increase flow of medium
X X Wear of internal parts Change internal parts
X X Back pressure of the
pump is lower than
expected
Setting of operational point
(Q, H)
X Viscosity and thickness
of medium higher than
recommended
Consult with professional
personnel from the pump
manufacturer
X Use of poor quality
materials
Change with high quality
materials
X Fault on the sealing and
fixing screws
Change seals and tighten
screws
X Seal on shaft is leaking Change the seal
X
X Damages on shaft and
seat of seal
Change the shaft and seals