Xylem e-NSCS - Manual (Page 18)

6 Maintenance
Precautions
Electrical Hazard:
Disconnect and lock out electrical power before installing or
servicing the unit.
WARNING:
• Maintenance and service must be performed by skilled
and qualified personnel only.
• Observe accident prevention regulations in force.
• Use suitable equipment and protection.
• Make sure that the drained liquid does not cause dam-
age or injuries.
6.1 Service
If the user wishes to schedule regular maintenance deadlines, they are
dependent on the type of pumped liquid and on the operating condi-
tions of the pump.
Contact the local sales and service representative for any requests or
information regarding routine maintenance or service.
Extraordinary maintenance may be necessary to clean the liquid end
and/or replace worn parts.
Motor bearings
After approximately five years, the grease in the motor bearings is so
aged that a replacement of the bearings is recommended. The bear-
ings must be replaced after 25000 operating hours or according to the
motor supplier maintenance instructions, whichever is shorter.
Motor with regreasable bearings
Follow motor supplier maintenance instructions.
6.2 Torque values
For information about torque values, pump data see Figure 28 .
6.3 Inspection checklist
Check the coupling Check the flexible elements of the
coupling. Replace the relevant
parts if there is any sign of wear
and check the alignment.
Check the mechanical seal Check for leakage of the mechani-
cal seal. Replace the mechanical
seal if leakage is found.
Checking the bearing seals Check correct seating of axial seal
rings mounted on the shaft. Only
gentle contact of the sealing lip
shall be established.
6.4 Disassemble and replace the pump parts
For more information about spare parts and assembly and disassem-
bly of the pump see Figure 1 , Figure 2 , Figure 3 .
See the Repair and Assembly Instructions which are available for
download from our homepage.
7 Troubleshooting
7.1 Troubleshooting for users
The main switch is on, but the electric pump does not start.
Cause Remedy
The thermal protector incorpo-
rated in the pump (if any) has
tripped.
Wait until the pump has cooled
down. The thermal protector will au-
tomatically reset.
The protective device against
dry running has tripped.
Check the liquid level in the tank, or
the mains pressure.
The electric pump starts, but the thermal protection trips a varying time
after.
Cause Remedy
There are foreign objects (solids or
fibrous substances) inside the
pump which have jammed the im-
peller.
Contact the Sales and Service
Department.
The pump is overloaded because
it is pumping liquid that is too
dense and viscous.
Check the actual power require-
ments based on the characteris-
tics of the pumped liquid and then
contact the Sales and Service
Department.
The pump runs but delivers too little or no liquid.
Cause Remedy
The pump is clogged. Contact the Sales and Service Department.
The troubleshooting instructions in the tables below are for installers
only.
7.2 The main switch is on, but the electric
pump does not start
Cause Remedy
There is no power supply. • Restore the power supply.
• Make sure all electrical connec-
tions to the power supply are in-
tact.
The thermal protector incorpo-
rated in the pump (if any) has
tripped.
Wait until the pump has cooled down.
The thermal protector will automati-
cally reset.
The thermal relay or motor
protector in the electric control
panel has tripped.
Reset the thermal protection.
The protective device against
dry running has tripped.
Check the:
• liquid level in the tank, or the
mains pressure
• protective device and its con-
necting cables
The fuses for the pump or
auxiliary circuits are blown.
Replace the fuses.
7.3 The electric pump starts, but the thermal
protector trips or the fuses blow immediately
after
Cause Remedy
The power supply cable is
damaged.
Check the cable and replace as nec-
essary.
The thermal protection or fuses
are not suited for the motor
current.
Check the components and replace
as necessary.
The electric motor is short cir-
cuit.
Check the components and replace
as necessary.
The motor overloads. Check the operating conditions of the
pump and reset the protection.
7.4 The electric pump starts, but the thermal
protector trips or the fuses blow a short time
after
Cause Remedy
The electrical panel is situated in an
excessively heated area or is ex-
posed to direct sunlight.
Protect the electrical panel from
heat source and direct sunlight.
The power supply voltage is not
within the working limits of the mo-
tor.
Check the operating conditions
of the motor.
en - Translation of the original instructions
18 e-nscs Installation, Operation, and Maintenance Manual