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•High Mechanical Maintenance
More components to fail over time:
–Gearbox failures
–Oil leaks & contamination
–Failed & misaligned drive shafts
–Excessive vibration
–Additional replacement time due
to large mounting frame
•Conventional Cooling Tower Control
–Lightly loaded majority of the time
–Peak load for short durations
–Started across the line
•High inrush currents
•Mechanical stresses
–Seal and bearing wear when fan “windmills”
Conventional Mechanical Issues