PROBLEM
POSSIBLE CAUSE
REMEDY
1.MOTOR DOES
NOT START
1a
Unsuitable power supply
Check that the mains frequency and voltage correspond to the electrical
characteristics shown on the indicator plate
1b
Incorrect electrical connections
Connect the power supply cable to the terminal board correctly. Check
that the thermal overload protection is set correctly (see data on the
engine indicator plate) and make sure that the fuseboard upline of the
engine has been properly connected
1c
Engine overload protective device cuts in.
Check the power supply and make sure that the pump shaft is turning
freely. Check that the thermal overload protection has been set
correctly (see engine indicator plate)
1d
Blown or defective fuses
Replace the fuses, check the electric power supply and points a) and c)
1e
Shaft blocked
Remove the cause of blockage as indicated in the “Blocked pump”
instruction booklet
1f
If the above causes have already been
checked, the engine may be malfunctioning
Repair or replace the engine by applying to an authorized service centre
2. PUMP BLOCKED
2a
Prolonged periods of inactivity with formation
of rust inside the pump
Rotation may be started directly from the pump shaft or from the
joint (remember to turn off the electricity supply first ) or contact an
authorized service centre
2b
Presence of solid bodies in the pump rotor
If possible, dismantle the pump casing and remove any solid foreign
bodies inside the rotor, if necessary contact an authorized service
centre
2c
Bearings siezed
If the bearings are damaged replace them or if necessary contact an
authorized service centre
3. THE PUMP
FUNCTIONS BUT
NO WATER
COMES OUT
3a
Possible infiltration of air from suction tube
connections, drain plugs or filling of pump
or from the gaskets of the suction pipe
Check which part is not tight and seal the connection adequately
3b
Foot valve blocked or suction pipe not
fully immersed in liquid
Clean or replace the bottom valve and use a suction pipe suitable for
the application
3c
Suction filter blocked
Clean the filter, if necessary, replace it . See point 2a) also.
4. INSUFFICIENT
FLOW
4a
Pipes and accessories with diameter too
small causing excessive loss of head
Use pipes and accessories suitable for the specific application
4b
Presence of deposits or solid bodies in the
internal passages of the rotor
Clean the rotor and install a suction filter to prevent other foreign
bodies from entering
4c
Rotor deteriorated
Replace the rotor, if necessary, contact an authorised service centre
4d
Worn rotor and pump case
Replace the rotor and the pump casing
4e
Excessive viscosity of the liquid pumped
(if other than water)
The pump is unsuitable
4f
Incorrect direction of rotation
Invert the electrical connections on the terminal board or control panel
4g
Suction head excessive in relation to the
suction capacity of pump
Try to close the feeder gate partially and/or reduce the difference in
level of the pump and the liquid being aspirated
4h
Suction pipe too long
Bring the pump closer to the suction tank so as to use a shorter pipe.
If necessary use a pipe of a wider diameter
5. NOISE AND
VIBRATIONS
FROM THE PUMP
5a
Rotating part unbalanced
Check that no solid bodies are obstructing the rotor
5b
Worn bearings
Replace the bearings
5c
Pump and pipes not firmly attached
Anchor the delivery and suction piping as needed
5d
Flow too strong for the diameter of the
delivery pipe
Use bigger diameters or reduce the pump flow
5e
Functioning in cavitation
Reduce the flow by adjusting the feeder gate and/or using pipes with
a bigger internal diameter. See point 4g) too
5f
Unbalanced power supply
Check that the mains voltage is right
5g
Incorrect alignment of pump-motor unit
If necessary, the unit must be re-aligned
6. LEAKAGE FROM
THE MECHANICAL
SEAL
6a
The mechanical seal has functioned when
dry or has stuck
Make sure that the pump casing (and the suction pipe if the pump is
not self-priming) are full of liquid and that all the air has been expelled.
See point 5 e) too.
6b
Mechanical seal scored by presence of
abrasive parts in the liquid pumped
Install a suction filter and use a seal suited to the characteristics of the
liquid being pumped.
6c
Mechanical seal unsuitable for the type
of application
Choose a seal with characteristics suitable for the specific application
6d
Slight initial drip during filling or on first
start-up
Wait for the seal to adjust to the rotation of the shaft. If the problem per-
sists, see points 6a), 6b) or 6c) or contact an authorized service centre.
In cases 6a), 6b) and 6c), replace the seal, if necessary contact an
authorized service centre
PD WATER SYSTEMS - 3000 W. 16 Ave. Miami, FL 33012. TEL: (954) 474 9090 FAX: (954) 889 0413
