Idiomas disponibles
Idiomas disponibles
All fixings are secure.
Analyse fan / motor vibration and compare with past readings, and typical action levels in Annex 4: Table of vibration levels.
Re-lubrication, if required, in accordance with instructions.
Emergency Ventilation fan systems should be run and checked.
Typical twelve (12) month check:-
Emergency Ventilation fan systems should be run and operation certified.
7. Fault finding
7.1 Inspection must be carried out by
competent
personnel
accordance
with
International,
National
regulations, especially for hazardous
areas. Fan equipment should be
electrically isolated and locked out
before any work started.
Fan equipment - Fault finding:-
8. Repairs
8.1 Repairs must be carried out by competent personnel and in accordance with applicable International, National and Local
regulations, especially for hazardous areas. Fan equipment should be electrically isolated and locked out before any work started. It
may be desirable to remove fan to a non-hazardous area / workshop for repairs.
Any work undertaken on ATEX fan equipment by persons other than those from manufacturer or agreed with manufacturer, will
invalidate the provisions of the guarantee.
When any repair is made to ATEX fan equipment an "R" label with relevant data to indicate "Repair" and who is responsible, must
be applied to product – Refer IEC EN 60079-19.
8.2 Replacement parts
Refer Annex 8: Repair Figures (Figs)
Do not start working until all relevant safety procedures have been read, understood and actioned correctly.
For ATEX Refer IEC EN 60079-14, - 17, -19.
This may include purging the ventilation ductwork to ensure no exposure to hazardous gas, vapour, substance, upon subsequent
disassembly, and any potential hazard isolated.
Ensure that personnel are competent for work required, spare parts are correct for application, tools and materials to be used are
available and safe for environment.
Identify components, bolts, fixings to be removed, and identify location to ensure replaced in same location, this can be done by
marking with number / letter / colour to bolt fixing and any associated spacing material to identify location. This is especially
important for motor fixings to supports, and impeller shaft fixings to supports, where packing / spacing / shim material is used to
adjust motor / impeller shaft center line, and hence final impeller position.
Typical fan arrangement are shown in Annex 5: Typical fan assemblies.
8.3 Direct drive fans:
Impeller removal, motor replacement:
Version 1: impeller mounted to motor shaft with keyway.
Version 2: Impeller mounted to motor shaft with taper lock.
8.3.1. Isolate and lock off power to fan. Disconnect motor power cables.
8.3.2. Remove adjacent ductwork to provide access to fan impeller.
Can complete fan be removed to workshop for repair, or impeller removed in-situ? Small fans maybe easier to move to
workshop, whilst large fans may need special lifting facilities to support / lift impeller and motor. Ensure all materials and tools
needed are available. Fig 2.
8.3.3. Mark exact position of motor feet, to ensure replace in exact same location.
Fault
Possible cause
System pressure unstable
and
in
Impeller imbalance
applicable
Motor bearings worn / damaged
Drive belts loose or too tight
and
Local
Impeller drive shaft loose
Excessive Vibration
Impeller drive shaft bearings
Impeller drive shaft bent / damaged
Bearing or drive missalignment
Damage to impeller
Distortion to fan assembly
System pressure higher than design
Excessive power
Impeller rotation incorrect
consumption
Impeller speed higher than design
System pressure higher than design
System pressure higher than design
Reduced airflow
Impeller rotation incorrect
Impeller speed lower than design
Overheat device
Incorrect electrical power supply
Isolator switched out
Fan non operation
Fuse / overload open
Belt drive fault
Broken belt
Fan stall
Impeller , pulleys loose
Bearing, drive missalignment
Debris, dirt on impeller
Impeller imbalance
Excessive Noise
Bearing damage
Belt drive worn
Loose fixings
Vibrating duct work
Mismatched belts
Fig 1.
Fig 2
Investigate
System pressure , blockage, dampers Rectify system pressure and re-commision fan
Vibration source
Vibration source
Vibration source
Vibration source
Vibration source
Vibration source
Vibration source
Vibration source, foreign bodies
Vibration source
System pressure , blockage, dampers Rectify system pressure and re-commision fan
Impeller / airflow direction
Impeller / motor speed
System pressure , blockage, dampers Rectify system pressure and re-commision fan
Fan Inlet / outlet loss excessive
Impeller / airflow direction
Impeller / motor speed
Inspect power supply to motor
Power supply to motor
Power supply to motor
Power supply to motor
Belts and pulleys
Belts and pulleys
System pressure exceed design
Impeler / pulley fixings
Bearings / pulleys
Inspect
Inspect
Inspect
Inspect
Inspect
Inspect for duct vibration
Inspect
Fig 3
Typical: axial diameters < 710mm
Typical: axial diameters > 710mm
Fig 3.
33
Action
Correct and rebalance
Correct and replace bearings
Correct or replace belts
Correct and refix mountings
Correct and replace bearings
Correct and replace shaft and bearings
Correct and replace bearings
Correct and clean
Correct and level fan assembly
Correct and re-commision fan
Correct and re-commision fan
Rectify duct connection and re-commision fan
Correct and re-commision fan
Correct and re-commision fan
Correct reason for overheat
Corect power supply
Corect power supply
Corect power supply
Correct or replace
Correct or replace
correct system pressure
Correct fixings
Correct fixings
Clean, check balance
Correct and rebalnce
Correct and / or replace
Correct and / or replace
Correct and / or replace
Stiffen duct
Correct and / or replacet
Capítulos
