Table of Contents
Advertisement
16.6 SWITCH ON
Before switching on, confirm that the electrical supply is fully compliant with the requirement of the motor as detailed on the
motor or fan nameplate, that the fan is correctly installed, all component parts and fasteners are secure, safety guards are in
place and no loose items or associated equipment are present in the vicinity.
Immediately after switch-on check that the rotation direction is correct. For three phase motors, if the rotation direction is
incorrect, then this can be rectified by interchanging any two incoming phase connections of the electrical supply at the motor
terminal block.
Check the assembly for smooth, low vibration running, and check that the current consumption is within the full load current
specified on the nameplate. The fan motor must not be repeatedly or rapidly switched on and off as this could cause
overheating of the motor or its associated wiring connections
17. MAINTENANCE
DANGER!
No maintenance work must be attempted before switching off and completely isolating the fan assembly, its
anti-condensation heater (If fitted), and its controls, from all electrical supplies and allowing the rotating parts of
the fan to come to rest.
WARNING!
Before entering the area ensure that all fumes, dust, toxic emission, heat etc. have dispersed from the local
environment, and the fan blades are not likely to freely rotate.
WARNING!
All lifting aids used during maintenance, and all lifting points utilised, must be adequately certified to carry the
weight of the equipment being lifted. (See paragraph 15).
WARNING!
Always wear appropriate protective clothing (including hard hats, eye protectors and ear defenders etc.) when
working in the vicinity of the fan assembly.
Fan assembly maintenance must be carried out by appropriately qualified and competent personnel using the correct tools
and equipment. A regular maintenance schedule should be established, and a record kept. Recommended maintenance
intervals are given within Table 1 (page 16).
Where the environment is particularly dirty, it may be necessary to reduce maintenance / service intervals. Internal and
external fan surfaces may be cleaned with low pressure clean water and non-abrasive additives. Water or liquid cleaning
agents must not be directed at motor drain holes, as this could cause liquid ingress that then results in damage to the product.
After maintenance has been conducted and before the fan is re-started, always ensure that there are no loose items of
equipment present in the vicinity of the fan, that all safety guards, chains or steel ropes, etc., are properly secured into their
original location, and that any temporary device used to stop the fan blades from rotating has been removed.
17.1 FASTENERS
It is essential to ensure that all fan assembly fasteners are secure. When examining and checking the security of fasteners
during routine maintenance (see Table 1 Items 10 and 11), any fasteners which have locking devices fitted or are painted over,
need not be disturbed if it can be seen that they are secure. Any locking devices that are disturbed during maintenance must
be discarded and replaced with new identical devices. Thread forming screws must have locking compound applied when being
reused. Any fasteners which have no locking devices fitted and are not painted over, must be checked at 95% of their original
torque setting to ensure that no unnecessary disturbance of the fastener has occurred. Please refer to Woods Air Movement
USA for advice in relation to specific fastener torque values.
.
13
Advertisement
Table of Contents
