Lowara TDB 120, Инструкция по установке и эксплуатации

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Installation, Operating and Maintenance Instruction
Model TDB, TDV
TDB, TDV page 64
Revision 01
Issue 06/2012
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Cause Solution
■
Back-pressure too high
check facility for pollution, open discharge valve
reduce resistance in discharge pipe (e.g. clean filter if
necessary)
use larger impeller (note available motor power)
■ ■ ■
Back-pressure too low, discharge too low throttle discharge valve
■ ■
Speed too high reduce speed
compare speed of motor with specified pump speed (rating
plate)
when adjusting speed (frequency transformer) check refer-
ence value setting
■ ■
Speed too low increase speed (check available motor power)
compare speed of motor with specified pump speed (rating
plate)
when adjusting speed (frequency transformer) check reference
value settings
■ ■ ■ ■
Flow too little increase min. flow (open discharge valve, bypass)
■
Flow too big reduce flow (throttle discharge valve)
■ ■
Impeller diameter too big use smaller impeller
■ ■
Impeller diameter too small use larger impeller (check available motor power)
■ ■ ■ ■
Pump and/or pipes not completely filled with liquid fill
vent
■ ■ ■
Pump or suction/intake pipe blocked clean
■ ■
Air pocket in pipeline vent
improve course of pipe
■ ■ ■ ■ ■
Suction height too big / NPSH of system too small
increase liquid level and admission pressure
reduce resistance in the intake/suction pipe (change course
and rated width, open shut-off valves, clean filters)
■ ■ ■
Air being sucked in increase liquid level
check if suction pipe is vacuum-tight
■ ■ ■
Air being sucked in through shaft sealing clean sealing pipe
increase sealing pressure
replace shaft sealing
■ ■
Direction of rotation is wrong swap over two phases of power supply (to be done by an
electrician)
■ ■ ■ ■
Inner components suffering from wear replace worn parts
■ ■ ■
Density and/or viscosity of liquid handled is too high seek assistance
■
Shaft sealing is worn replace mechanical seal
check sealing, flushing and cooling pipes (pressure)
avoid dry running
■ ■
Lines and roughness on shaft or shaft sleeve
replace parts
■ ■
Deposits on mechanical seal
clean
replace mechanical seal if necessary
if necessary provide additional rinsing or quench
■ ■
Impeller out of balance
remove blocks/deposits
replace impeller if broken or unevenly worn
check shafts to ensure that they are running true
■ ■ ■
Coupling not aligned
align pump unit better
■ ■
Coupling distance too small change
■ ■ ■ ■ ■
Forces in pipeline too high (pump unit under strain)
change (support pipes, use compensators, etc.)
is foundation plate/frame properly cast in place?
■
Too much, too little or the wrong type of lubricant change
■
Electricity supply not right (2-phase running) check voltage of all phases
check cable connections and fuses
■
Sealing insufficient tighten screws
replace sealing
■ ■
Bearing damaged replace
check lubricant and bearing space for pollutants (rinse oil area)
■
Relief fittings insufficient
clean relief openings in impeller
replace worn parts (impeller, split rings)
adjust in line with the system pressure/intake pressure given on
ordering
■
System-related vibrations (resonance) seek assistance