M-44
AC Axial-flow Fans
Common Information
Precautions
!WARNING
Assembly
Be sure to attach a Finger Guard if there is a danger of the user
touching the Fan.
Attach a guard, protective net, or a Finger Guard (available as an
option) to the Axial Fan’s mounting section.
A variety of Finger Guards are available as options (R87F-FG).
Select a Finger Guard of a size appropriate for the Fan used. For
details of the available Finger Guards, refer to page 41.
Be sure to turn OFF the power supply and confirm that the blades
have stopped before performing inspections or replacing Filters.
Not doing so may result in injury due to contact with the blades.
!WARNING
Application
Do not touch the blades. Doing so may result in injury.
Ensure that no part of your body and no objects come in contact
with the blades while they are moving, otherwise injury may result
due to contact with the blades or due to scattering of object frag-
ments.
Handling
Do not use the Fan in locations subject to explosive, flammable, or
corrosive gases, or in locations subject to drops of water. Doing so
may result in fire, electric shock, or injury.
Do not use the Fan outside the rated temperature range or above the
rated voltage. Doing so will cause the temperature of the coil (at the
center of the Fan) to increase, and may result in deformation or
scorching of the blades.
Operate the Fan using a sine-wave power supply.
Do not hold the Fan by its power lines, or pull the power lines with
excessive force. Doing so may cause damage to the wire insulation
or break the wire, resulting in injury due to electric shock or the Fan
falling.
Mounting
Be sure to secure the Fan with the mounting bolts. Not doing so may
result in injury due to the Fan falling.
A precision-type ball bearing is used to hold the shaft of the Fan. The
structure of the ball bearing is prone to damage if the Fan is sub-
jected to shock (e.g., dropped). Ensure that the Fan is not subjected
to shock, otherwise the service life and performance characteristics
of the Fan will be adversely affected.
Wiring
Prevent short-circuiting of the Fan from adversely affecting other
devices by installing circuit-breakers in the Fan’s power lines.
Do not wire the power lines of the Fan in series with those of other
Fans or devices. Doing so may cause a voltage above the Fan’s
rated voltage to be applied, and this may result in malfunction or
burning. Be sure to wire devices in parallel.
Cleaning
Ensure that drops of water do no come in contact with the Fan.
Ensure that no organic solvents or alkaline chemicals are in contact
with plastic parts of the Fan, otherwise cracks, swelling, or dissolu-
tion may result.
When performing any action that requires touching the blades, such
as inspections, ensure that power is turned OFF. Unexpected opera-
tion of the Fan after, for example, the Fan has stopped due to contact
failure or due to the operation of the overheating protection function
(thermal protection), may result in injury.
Do not apply grease to the Fan or attempt to remodel it. Doing so
may result in malfunction or injury.
Correct Use
(1) Leakage Flux
Leakage flux from a Axial-flow Fan may distort the image on nearby
CRT screens. Measures to prevent this problem include:
1.
Keeping CRT’s at least 30 cm away from the Axial-flow Fan
2.
Shielding the Axial-flow Fan side with metal mesh.
The leakage flux from a Fan with metal blades is less than with plas-
tic blades. Note, however, that the leakage flux differs between the
inlet and outlet sides.
Leakage Flux Distribution Curves
The leakage flux distribution curves for inlet and outlet sides of the R87T Axial-flow Fans are shown below as examples.
Fan
Other
device
Fan
Other
device
Power lines connected in series
Power lines connected in parallel
Inlet
Outlet
Dimensions
Leakage flux distribution
Dimensions
Leakage flux distribution
Leakage flux (mT)
Leakage flux = 0
•
•
Measurement point
Leakage flux (mT)
Measurement point
