Troubleshooting - Nederman Airflow Alarm Kit Manual Del Usuario

7 Troubleshooting

All troubleshooting and similar activities should only be performed by skilled personnel with knowledge of the
plant function and construction, and in accordance with safety regulations, maintenance instructions, etc.
Fault
Alarm occurring briefly at
startup
Alarm occurring periodic-
ally
Alarm activated perman-
ently or for extended
periods.
Airflow Alarm Kit
Possible cause
Fan starts slowly.
• Extraction system
overloaded by too
many exhaust points
being opened at the
same time.
• Extraction system
overloaded by a bad
connection on one or
more exhaust points.
• Protection filter regen-
eration occurs too in-
frequently.
• Airflow Alarm Kit limit
set too high.
• Extraction system ca-
pacity less than before.
• Extraction system
overloaded by hav-
ing too many exhaust
points connected.
• Extraction system
overloaded by de-
fective connection on
one or more exhaust
points.
• The hose assembly
between air duct
and pressure switch
clogged.
• Airflow Alarm defect-
ive.
Solution
Alarm is activated for a maximum of 60 seconds dur-
ing startup. The alarm at startup may be considered
as a daily function check.
• Shut unused exhaust points.
• Limit the number of exhaust points to the capacity
of the plant.
• Establish automatic dampers and connect control
with max. limit.
• Extend extraction system capacity.
• Re-establish correct connections such as smaller
hose diameter, longer hoses, hoses without holes,
etc.
• For plants with filter regeneration during opera-
tion: Reduce time interval between regeneration /
decrease cleaning start level.
• For plants with regeneration in breaks: Stop the
plant more frequently or establish regeneration
during operation.
• Call Nederman service technician.
• Clean or replace clogged protection filter in the ex-
traction system.
• Clean clogged air ducts/fan.
• Replace flexible connections at the fan.
• Replace defective V-belt drives/fan motor.
• Fix or replace defective fan.
• Shut unused exhaust points.
• Limit number of exhaust points to plant capacity.
• Establish automatic dampers and connect control
with max. limit.
• Extend extraction system capacity.
• Re-establish correct connections, such as smaller
hose diameter, longer hoses, hoses without holes
etc.
• Check the hose and the protection filter between
the pressure switch and the air duct for clogging.
Blow air to clean if necessary.
• Call Nederman service technician.
EN
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