Pentax HP Serie Instructions D'utilisation page 67

7. PROBLEMS, CAUSES AND SOLUTIONS
• TABLE FOR SEEKING FAILURES
The search for the failures and for the possible repair interventions must comply with all the safety precautions reported in chapter 6
"MAINTENANCE" and in chapter 3 "SAFETY".
PROBLEMS
1 - The electropump does not start. ........
2 - The electropump delivers no fluid. .....
3 - The electropump delivers an
.
insufficient capacity
4 - The electropump vibrates and is noisy.
PROBABLE CAUSES
A) - No mains voltage. .........................
B) - Motor or supply cable short circuit.
C) - Impeller blocked because
ments or foreign bodies (check
rotation in the manual).
D) - Impeller blocked for wrong reassembly
(check rotation in the manual).
A) - Wrong rotation direction. ...............
B) - Too low rotation speed.. .................
C) - Cavitation. ....................................
D) - Clogged piping. ............................
E) - Obstructed impeller. .......................
F) - Obstructed foot valve or filters. .......
A) - Wrong rotation direction. ...............
B) - Too low rotation speed. ..................
C) - Cavitation .....................................
D) - Clogged piping. ............................
E) - Obstructed impeller. .......................
F) - Obstructed foot valve or filters. .......
G) - Air in the piping. ...........................
H) - Required head of installation
higher than the project head.
I) - Worn wear rings. ..........................
A) - Air in the pump. ............................
B) - Water with a high content of air
(air entrance from the suction piping).
C) - Cavitation. ....................................
D) - Obstructed impeller. .......................
E) - Desaligned coupling. .....................
F) - Too heavy piping loads on
the pumps.
G) - Worn pump bearings. ....................
H) - Worn motor bearing. .....................
I) - Unbalanced impeller. .....................
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POSSIBLE SOLUTIONS
A) - Provide electric input.
B) - Repair the motor or replace the cable
(call in the electrician).
of settle
C) - Disassemble the pump and remove any
settlements from the wear rings and
from the impeller.
D) - Disassemble the pump and reassemble
the rotor correctly.
A) - For threephase motors,change the
phases;for single phase motors,
change type of connections.
B) - Check supply frequency and increase
the speed (combustion engines).
C) - Check suction height. Overhaul the
installation.
D) - Check and clean.
E) - Disassemble and clean.
F) - Check and clean.
A) - For threephase motors, change the
phases; for single phase motors,
change type of connections.
B) - Check supply frequency and increase
the speed (combustion engines).
C) - Check suction height Overhaul the
installation.
D) - Check and clean.
E) - Disassemble and clean.
F) - Check and clean.
G) - Deaerate.
H) - Overhaul the installation Increase the
speed (combustion engines).
Increase impeller diameter.
I) - Check and replace.
A) - Vent the air.
B) - Check the suction piping.
C) - Check suction height
.
D) - Disassemble and clean.
E) - Check and align.
F) - Check flanges alignment, piping fixing
and fastening to the basement.
G) - Check and replace.
H) - Check and replace.
I) - Check and balance.