A SERVICE OF

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11
Mechanical Equipment:
Warranty is void if the fluid cooler is operated at speeds which cause
damagingvibrationstothetowerandassociatedequipment.When
utilizingavariablefrequencydrive,theuidcoolermustbetested
acrossthefullrangeofspeedsandcheckedagainstCTIguidelines
forexcessivevibration.Speedrangesnotmeetingtheseguidelines
mustbelockedoutintheVFD.
Always shut off electrical power to the fluid cooler fan motor prior
to performing any maintenance on the fluid cooler. Any electrical
switchesshouldbelockedoutandtaggedouttopreventothersfrom
turningthepowerbackon.
1. Spin the fan manually and observe the action of the sheaves and belts
to be sure that the motor is properly aligned with the fan sheave. See
Belt Tensioning and Sheave Alignment on page 21.
2. Momentarily bump (energize) the motor(s) and observe rotation of
the fan(s). The fan should rotate in a counterclockwise direction
when viewed from the fan inlet side from the motor end. If rotation is
backwards, shut off the fan and reverse two of the three primary leads
supplying power to the motor.
Iftowerisequippedwithatwo-speedmotor,checkforproperrota-
tionatbothspeeds.Checkalsotoseethatstarterisequippedwitha
20 second time delay which prevents direct switching from high
speed to low speed.
3.  Checkthetorqueonthefanandmotorsheaveafter10to60hoursofopera-
tion.SeeBushingFastenerTorqueValuesonpage21.
Caution
Installation
Warning
Warning