Friday, August 16, 2013
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Indication
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Cause
|
Remedy
|
Machine vibrates
|
|
i. None
ii. Stop immediately and
establish cause
iii. Badly tightened lock
ring involves fatal
danger
iv. Renew rubber washers
v. Reinforce foundation
|
Speed too high
|
I. tachometer reading wrong
II. Wrong
transmission
III.The motor
speed is not appropriate
|
· Check be means of rev counter
· Stop immediately. Check
that proper
transmissions
or belt pulley is used in
view of mortar speed
· Stop immediately and
provide a motor with
correct speed
|
|
Speed too low
|
· Brake applied
· Pads of clutch are
worn or oily
· Voltage drop in
mains
· Ball bearing
damage
· Other machine
defects
· Motor defects
|
· Release the brake
· 20exchange or clean all
pads
· Check mains voltage
· Locate and exchange
defective bearing
· Stop immediately. Check
that bowl can be
rotated
by hand
· Exchange or repair motor
|
|
Starting power too low
|
· Ammeter reading wrong
· Clutch pad worn or oily
|
· See—speed is too low
|
|
Starting power too high
|
1) Ammeter reading wrong
2) Motor defect
30ballbearing damaged
4) Other machine defects
|
1) Exchanger repair motor
2) Locate and exchange defective bearing
See—speed is too low
|
|
Retardation time too long
|
1) Brake lining worn or oily
|
1) Exchange or clean lining
|
|
Water is worm gear housing
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1) Condensation
2) Axial seals not tight or turned wrongly
3) Leakage via top bearing
|
1) Drain water
2) Exchange rings and turn correctly
3) Exchange seal ring and adjust axial seal
|
|
Noise from worm gear housing
|
1) Oil quality wrong
2) Worm wheel
3) Ball bearing worn or damaged.
|
1) Check quantity and quality
2) Exchange worn parts
3) Exchange bearing
|
|
Noise from clutch coupling
|
1) Normal when starting and stooping due to sliding of
friction blocks
2) Wrong play between coupling pulley and elastic plate
3) Speed too low
|
1) none
2) Adjust
3) See—speed to low
|
|
Smell
|
1) Normal at start and stop when friction blocks are
sliding thus causing bunt smell
2) V-belt or flat belt are sliding
3) Bearing running hot
4) Motor over heated
|
1) None
2) Clean belt adjust belt tension
3) Feel over machine and locate spot exchange bearing
4) Trace cause adjust over current relay, if any provided
|
|
‘Scrapping’ sound
|
Wrong height position
|
Stop and adjust
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CLEANING, OVERHAULING AND LUBRICATION
Satisfactory functioning cannot be ensured unless the parts
in contact with liquid are carefully cleaned before assembly. This applies
particularly to seal rings, sliding surfaces, guiding and contact surfaces, and
threads. Also take care that no burrs are knocked up on the metal parts when
handling them.
EXCHANGE OF PARTS
Each bowl constitutes a balanced unit which will get out of
balance if any parts having an “*” added to their part number in the general
drawing are exchanged without the bowl being rebalanced. To prevent confusion
of the parts, for instance when a plant consists of several machines of the
same type, these main parts are stamped either with the complete manufacturing
number or its three last digits.
GUIDES
When assembling makes sure that the parts are placed in the
position defined by the guides. Be careful not to damage the guides when
handling the parts.
SEAL RINGS PACKING
Check seal rings and packings for defects and make sure that
the corresponding grooves and sealing surfaces are well cleaned.
After mounting check:
… that the ring lies properly (not twisted) in the groove.
… that it fills the groove evenly all around.
THREADS PRESSURE IN DISC SET
Check the lock ring threads and the pressure in the disc set
at regular intervals.
CORROSION. EROSION
Aggressive liquids as well as liquids containing very hard
particles may cause corrosion and erosion damage. If rapidly growing or
advanced damage is noticed, consult an ALFA-LAVAL/DE LAVAL representative.
