12
13
5. Frost Protecting
Pump can be used in the system with anti-frozen measures. If the pump
is installed in easily frozen environment, suitable antifreeze shall be added
to the transferring liquid to prevent pump from being damaged. If antifreeze
is not used, pump shall not be used during periods of frost. Pump should be
drained when stops using.
6.The following should be checked regularly for pump
· Pump working and operating pressure
· Possible leakage
· Possible motor overheat
· Cleaning/replacement of all strainers (If strainers fit)
· The switch off time of motor overload
· Frequency of starts and stops
· All control operation
If find faults, check system according to “Fault Finding and Solution chart”.
· Pump shall be cleaned and kept appropriately when it is not used for
a long time.
· Pump shall be prevented from being corrupted and damaged in storage.
VI. ASSEMbLE AND DISASSEMbLE
HF, HX, HN
· Fit discharge head on the motor. Fit mechanical seal. The faces of mechanical
seal should be lubricated.
· Fit the impellers, diffusers etc. in position according to the drawing.
Then fit impeller cover, tighten nuts, fit seal circle on every diffusers.
· Fit suction head, stay bolts, tighten the nuts of stay bolts.
· Rotate the motor fan by hand to ensure that the shaft is not choked.
Reverse the process above can disassemble a pump.
VII. FAuLT FINDINg AND SOLuTION CHART
Caution: Before removing the terminal box cover and before any removal /
dismantling of the pump, make sure that the power supply has been switched
off.
Fault
Cause
Solution
Remarks
Motor does not run
when started
a) Power supply failure.
a) Check power supply.
b) Fuses are blown.
b) Replace fuses.
c) Motor is overloaded.
c) Check system.
d) Main contacts of starter are
not connected well or the coil
is defective.
d) Replace motor starter.
e) Control circuit is defective.
e) Check control circuit.
f) Motor is defective.
f) Repair.
Overload device of
motor starter trips out
immediately when
power supply
is switched on
a) Fuses are blown.
a) Replace fuses.
In the case of
d)
and
e)
, users shall
not disassemble the
pump by themselves.
b) Contacts of overload device
are faulty.
b) Check motor starter.
e) Cable connection is loose
or faulty.
c) Check cables and
power supply
d) Motor winding is defective.
d) Replace motor
e) Pump mechanically blocked. e) Check and repair
pump
Overload device trips
out occasionally
a) The setting of overload is
too low.
a) Reset overload setting
b) Periodic power supply faults. b) Check power supply
c) Low voltage at peak times.
c) Add regulator.
Motor starter has
not tripped out but
the pump does not
run.
a) Contacts of starter are not
contacted well or the coil is
faulty.
a) Change motor starter
b) Control circuit are defective
b) Check control circuit