Installation, Operation & Maintenance Manual
IM-166
13
Motor Support Adjustment
(refer to safety section)
Two different types of motor mounts, post and saddle, are used on AMX Mixed Flow fans. The mount to use depends on the size of
the fan and motor.
On the post type motor mount, the motor plate is supported on four threaded rods. Belt tension is adjusted by loosening the four nuts
on top of the motor plate and raising the motor plate by adjusting the four nuts underneath it. The top nuts should then be tightened
to hold the motor plate in place.
On the saddle type motor mount, the motor pivots on one side and adjustment of belt tension is achieved by loosening the nuts on
top of the motor plate on the other side, then raising the motor plate by adjusting the nuts underneath the motor plate. The nuts on
top of the motor plate should again be tightened to hold the motor plate in place. Several holes are provided on the pivot side and
the pivot point can be raised for gross belt adjustment. If this adjustment is made, however, the motor plate should be as parallel as
possible to the fan centerplane. Care should be taken to maintain drive alignment and proper belt tension.
Maintenance
(refer to safety section)
Develop a regular maintenance schedule according to your needs and the
criticality of the fan. Periodic inspections, lubrication and observations
of sound and vibration will help prolong the life of the fan. If changes
are noted check bolt tightness, foundation integrity, cleanliness of
the impeller and or motor, bearing lubrication and drive components.
Always keep records of the maintenance that is performed.
Motor Maintenance
The three basic rules of motor maintenance are:
1. Keep the motor clean.
2. Keep the motor dry.
3. Keep the motor properly lubricated.
Blow dust off periodically (with low pressure air) to prevent
motor from overheating.
Some smaller motors are lubricated for life. Lubrication requirements are normally attached to the motor. Use the motor manufacturer’s
recommendations for relubrication. Often motor lubricants are not the same as the fan bearings. If this information is not available,
the Motor Lubrication Schedule may be used.
Shaft grounding rings are recommended for some VFD applications. If the motor is equipped with a shaft grounding ring a yearly
inspection for wear and shaft corrosion is recommended. Replace the ring if it is making minimal contact with the shaft. If corrosion
is present, treat the shaft with colloidal silver per the ring manufacturer's instructions.
Motors Less than 10 HP
Running 8 Hrs/Day
(clean environments)
Motors Between
15-40 HP
(clean environments)
Motors Running 24/7
or if in dirty/dusty
environments
Lube every 5 Years
Lube every 3 years
Divide the service
interval by 4
Motor Lubrication Schedule
Do not over lubricate.
