Troubleshooting For Users - Xylem Lowara ESH Serie Installations- Betriebs Und Wartungshandbuch

en - Original instructions
without forcing as far as it will go.
2. Make a notch as reference on both half
couplings; see Figure 22.
3. Rotate the same half coupling in the
opposite direction as far as it will go.
4. Measure the distance between the two
notches: this will be the torsional
backlash.
Coupling Maximum permitted
torsional backlash ΔS
size
[mm]
68 5.5
80 5.0
95 6.0
110 7.0
125 8.0
140 8.0
160 8.0
If the torsional backlash exceeds the maximum
permitted limits, contact Xylem or the Authorised
Distributor for the replacement of the coupling.
6.2 Inspection checklist
Check the Check the flexible elements
coupling of the coupling. Replace the
relevant parts if there is any
sign of wear and check the
alignment.
Check the Check for leaks on the
mechanical mechanical seals; if any are
seal detected, contact Xylem or
the Authorised distributor.
Checking the Check correct seating of
bearing seals axial seal rings mounted on
the shaft. Only gentle
contact of the sealing lip
shall be established.
Check for Check frequently for quiet
quiet running running of the pump with
vibration measurements
tools.
6.3 Disassemble and replace the
pump parts
For more information about spare parts and
assembly and disassembly of the pump,
contact Xylem or the Authorised Distributor.
Repair and/or maintenance of the pump must
only be carried out by Xylem or the Authorised
Distributor.
7 Troubleshooting

7.1 Troubleshooting for users

The main switch is on, but the pump unit does
not start.
Cause
The thermal
protector
incorporated in the
pump (if any) has
tripped.
The protective
device against dry
30
V
Solution
Wait until the pump
has cooled down. The
thermal protector will
automatically reset.
Check the liquid level
in the tank, or the
running has
tripped.
The pump unit starts, but the thermal protector
trips a varying time after
Cause Solution
There are foreign Contact Xylem or the
objects (solids or Authorised Distributor.
fibrous
substances) inside
the pump which
have jammed the
impeller.
The pump is Check the actual
overloaded power requirements
because it is based on the
pumping liquid characteristics of the
that is too dense pumped liquid and then
and viscous. contact Xylem or the
Authorised Distributor.
The pump runs but delivers too little or no
liquid.
Cause Solution
The pump is Contact Xylem or the
clogged. Authorised Distributor.
The troubleshooting instructions of the
following tables are only for installation
personnel.
7.2 The main switch is on, but the
pump unit does not start
Cause Solution
There is no power
supply.
The thermal Wait until the pump
protector has cooled down. The
incorporated in the thermal protector will
pump (if any) has automatically reset.
tripped.
The thermal relay Reset the thermal
or motor protector protection.
in the electric
control panel has
tripped.
The protective Check:
device against dry
running has
tripped.
The fuses for the Replace the fuses.
pump or auxiliary
circuits are blown.
7.3 The pump unit starts, but the
thermal protector trips or the fuses
mains pressure.
•
Restore the
power supply.
•
Make sure all
electrical
connections to
the power supply
are intact.
•
liquid level in the
tank, or the mains
pressure.
•
protective device
and its
connecting
cables.