OMM-11-0211-page 9
15.
■
■ ■
■ ■
■
Apply power to the motor and let it come up to full speed. Turn off the power. Look and listen for any unusual
noise or mechanical abnormality while the blower wheel is still spinning. If any are noticed, lock out the power,
wait for the blower wheel to come to a complete stop, locate the cause and correct it.
16.
■
■ ■
■ ■
■
Unlock power and start the blower.
17.
■
■ ■
■ ■
■
Unlock power to the motor and run the blower for 15-20 minutes to allow belts to “seat” properly.
Turn off and
lock out power to the motor.
18.
■
■ ■
■ ■
■
Remove the belt guard.
19.
■
■ ■
■ ■
■
Check the belt tension with a
“belt tensioning gauge”
. If the belts are too loose, loosen the 4 nuts holding the
motor feet on the motor slide base and re-adjust the belt tension.
20.
■
■ ■
■ ■
■
Tighten the 4 nuts in the motor feet.
21.
■
■ ■
■ ■
■
Unlock power to the motor and run the blower for 8 hours. The belts should be running as shown in
Fig. 4
on
page 6. If not, repeat steps 19 and 20
after you have turned off and locked out power to the motor.
22.
■
■ ■
■ ■
■
When belts are running properly,
turn off and lock out power to the motor.
Re-install belt guard
23.
■
■ ■
■ ■
■
Unlock power to the motor and run the blower.
24.
■
■ ■
■ ■
■
Measure, record and keep the following motor data for future reference and comparison:
(Single phase motors will only have L1 and L2 leads)
Amperage draw on each motor lead: L1_______ L2_______ L3_______
(Running amps should NOT exceed the motor name plate amps for the voltage being operated on).
Voltage coming to motor leads: L1_______ L2_______ L3_______
(Should be about the same input voltage on all leads).
25.
■
■
After running the blower for 24 hours,
turn off and lock out power to the motor,
remove belt guard and repeat
steps 19 through 23 above.
26.
■
■
Repeat step 25 after 100 hours and periodically after that but never more than a one year period.
B. Vibration:
The blower was balanced at the factory to comply with ANSI/AMCA Standard 204-05, Category BV-3. However, rough
handling in shipment and/or erection, weak and/or non-rigid foundations, and misalignment may cause a vibration
problem after installation. After installation, the vibration levels should be checked by personnel experienced with vibra-
tion analysis and vibration analysis equipment.
NOTE:
The blower
SHOULD NOT
be operated if the vibration velocity of the blower exceeds 0.40 inches per second, filter out,
if the blower is rigidly mounted. If the blower is mounted on isolators or on an isolator base, it
SHOULD NOT
be oper-
ated if the vibration velocity of the blower exceeds 0.65 inches per second, filter out.
Vibration readings for belt driven blowers should be taken at the top, sides and end as per
Fig. 6
below. They should
also be taken on the top, sides and ends of the blower bearings as per
Fig. 7
below. After you have taken your vibra-
tion readings, write them down in the spaces in
Fig. 8
on page 10 and keep for future comparison.
Taking vibration readings at the fan bearings must be performed with EXTREME CAUTION. Since the fan
must be running to take the readings, it is imperative that you exercise caution so as not to cause, or be
subjected to, personal injury from rotating belts and/or sheaves. This procedure should only be completed
by personnel trained in vibration analysis with the proper vibration analysis equipment.
DANGER
Fig. 7 (Blower bearing reading points)
Fig. 6 (Motor reading points)