Triangle Engineering of Arkansas JD - Manual (Page 2)

develop then some suggestions are offered here as a guide
toward remedying the cause.
Check rotating members for adequate clearance.
Check proper belt tension and pulley alignment.
Check installation and anchoring.
Check fan bearings.
START-UP AND OPERATION
Careful inspection should be made before start­up. All motor
bearings should be properly lubricated, all fasteners should be
securely tightened. Impeller should be rotated by hand to insure
free movement. (NOTE: Before placing hand on propeller, or
V­belts local out primary and secondary power source). Check
all set­screws and keys. Tighten where necessary.
The condition of V­belts and the amount of belt tension
should be checked prior to start­up. When it becomes
necessary to adjust belt tension, do not over­tighten as
bearing damage will occur. Recommended belt tension
should permit 1/64" per inch of span deflection of the belt on
each side of the belt measured halfway between the pulley
centerline. Extreme care must be exercised when adjusting
V­belts as not to misalign the pulleys. Any misalignment will
cause a sharp reduction in belt life and will also produce
squeaky, annoying noises. On units equipped with 2 or 3
groove pulleys, adjustments must be made so that there is
equal tension on all belts (see drawing below).
WARNING - Whenever belts are removed or installed,
never force belts over pulleys without loosening motor first to
relieve belt tension. The fan has been checked at the factory
prior to shipment for mechanical noises. If mechanical noise
should develop, then some suggestions are offered here as a
guide toward remedying the cause.
1. Check rotating members for adequate clearance.
2. Check proper belt tension and pulley alignment.
3. Check installation and anchoring.
4. Check fan bearings.
The inlets and approaches to the exhauster should be
free from obstructions. To assure maximum air movement
adequate supply air must be available.
Power lines compatible with the motor requirements are
brought up from an electrical source to the unit. A generous
amount of slack in power lines should be provided to allow for
motor deflections and to permit movement of motor for belt­
tension adjustments. Motor must be securely and adequately
grounded. Protect power lines from sharp objects. Do not
kink power line or permit it to contact hot surfaces, chemicals,
grease or oil.
Before putting any fan into operation, the following check
list should also be completed:
a. Lock out primary and secondary power source. b. Make
sure installation is in accordance with manufacturer’s
instructions.
c. Check and tighten all fasteners. d. Spin propeller to see
if rotation is free and does not bind or rub.
e. Check all set­screws and keys and tighten if necessary.
f. Check V­belt or direct drive coupling for alignment. Use
recommended belt tension.
g. Check V­belt for proper sheave selection and make sure
they are not in reverse position.
h. Make sure there is no foreign loose material in duct work
leading to and from fan or in the fan itself.
j. Properly secure all safety guards.
k. Secure all access doors to fan and duct work.
I. Check line voltage with motor nameplate.
m. Check wiring. (NOTE: On single phase motors, the
terminal block must be set up in accordance with the
nameplate instructions and/or wiring diagram. The set­up
must match the line voltage. If the motor is 3 phase, the
winding leads must be grouped and connected as shown
on the wiring diagram. The line voltage must correspond
with proper grouping of motor leads. On 2­speed motors
the wiring diagram must be followed precisely or serious
motor damage will occur.)
Switch on electrical supply and allow fan to reach full
speed. If heater elements are tripping out the starters, the
following items should be investigated:
Is the heater element the correct size for the motor?
Is the starter located in a high ambient temperature?
Is the propeller rotating in the correct direction??
Is the line voltage excessively low?
Is the motor wired properly to suit the line voltage?
Check carefully for:
1. Correct rotation of the propeller (NOTE: Incorrect rotation
overloads motor severely and results in serious motor
damage. To change rotation of 3 phase units, simply
interchange any two of the three line leads. On single
phase units, change the terminal block set­up following
the wiring diagram).
2. Check motor and bearing temperatures so that they are
not excessively hot. (NOTE: Use care when touching
the exterior of an operating motor. Modern motors
normally run hot. They are designed to operate at higher
*Deflection height = 1/64" per inch of span
BELT AND PULLEY ALIGNMENT
WRONG WRONG CORRECT