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11
Detailed Component
Maintenance
Procedures
Cold Water Basin
Inspection & Maintenance
Fan
Inspection & Maintenance
Fan Drive System
BALTIDRIVE
®
Power Train/
BALTIGUARD™ and
BALTIGUARD PLUS™ Fan System
•
Tip Clearance:
Check the clearance between the tip of the blade and the fan cowl. The
clearance should be sufficient to prevent the fan blades from contacting the fan cowl
during operation. Contact your local BAC Representative if there are any concerns.
•
Drain Holes
: On hollow blades, the drain hole in the blade tip should be unobstructed.
Tip: Use a piece of wire to probe the drain hole.
•
Blade Pitch:
Check to ensure that the blades are all at the same pitch. If uncertain,
measure the pitch with an inclinometer. All blades should be within 1/2° of each
other.
•
Rotation:
Turn the fan by hand to ensure that it moves freely with no rough spots,
binding, or other malfunctions that could cause vibration or fan motor overload. While
rotating the fan, check the blade tracking. All blades should track within a 1” band at
any single point around the cowl.
•
Direction of Rotation:
On initial start-up, or if the fan motor has been rewired, briefly
energize the fan motor and note the direction of fan rotation. It should rotate in the
direction indicated by the arrow on the fan cowl.
•
Operation:
On initial start-up, run the fan in the manual position for several minutes,
and check for any unusual noises or vibration.
Fan Drive System
BALTIDRIVE
®
Power Train/BALTIGUARD™ and BALTIGUARD PLUS™
Fan System
The BALTIDRIVE
®
Power Train consists of a solid-
backed, multi-groove, neoprene/polyester belt rated
for cooling tower service, and corrosion-resistant
sheaves. These components provide high reliability
with low maintenance requirements.
The BALTIGUARD™ Fan System consists of
two standard single-speed fan motors and drive
assemblies. One drive assembly is sized for full speed
and load, and the other is sized for approximately 2/3
speed and consumes only 1/3 the design horsepower.
The BALTIGUARD PLUS™ Fan System builds on the advantages of the BALTIGUARD™
Fan System by adding a VFD to one of the motors.
Inspection & Maintenance
These drives require a periodic check of the belt condition and, when necessary, tension
adjustment. The recommended service intervals are as follows:
•
Initial Start-Up:
The drive has been tensioned and aligned at the factory; however, prior
to initial startup, check belt tension.
•
Seasonal Start-Up:
Readjust the belt tension (if required).
•
Operation:
After the first 24 hours of operation, readjust the belt tension on a new unit
start-up or installation of a new belt. Thereafter, check the belt condition monthly, and
adjust tension as necessary. Readjust tension at least once every three months.
Figure 2.
BALTIGUARD™ Fan System
ATTENTION:
Check to ensure the
controls for the fan motor are set
to allow a maximum of six on-off
cycles per hour to prevent motor
overload.