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Airflow Alarm Kit EN
18
8 Troubleshooting Assistance
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 Possible Cause Solution
Alarm occurring briefly at
startup
Fan starts slowly. Alarm is activated for a maximum of 60 seconds during startup.
The alarm at startup may be considered as a daily function check.
Alarm occurring
periodically
•
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 regeneration occurs too
infrequently.
•
Airflow alarm limit set too high.
•
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 operation: 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.
Alarm activated
permanently or for
extended periods.
•
Extraction system capacity less than before.
•
Extraction system overloaded by having too
many exhaust points connected.
•
Extraction system overloaded by defective
connection on one or more exhaust points.
•
The hose assembly between air duct and
pressure switch clogged.
•
Airflow Alarm defective.
•
Clean or replace clogged protection filter in the extraction
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.
Alarm is not activated in
connection with startup
or when it is supposed to
be activated.
•
No power supply.
•
The hose/protection filter is clogged.
•
Hose assembly for the pressure switch
clogged.
•
Pressure switch defective.
•
Change the defective fuse.
•
Have an electrician check the wiring system.
•
Disconnect the pressure switch, and clean the hose and
protection filter. Reconnect the pressure switch.
•
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 technician.
•
See also figure 5.
The POWER FAILURE LED
is not lit.
•
A connection to the voltage supply has
been cut off.
•
Battery backup is defective.
•
See figure 5.
•
Change the fuse.
•
Have an electrician check the voltage supply.
•
Replace the battery.