SPX Cooling Technologies CoolingTower Marley MCW - Manual (Page 10)

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you are installing a VFD other than the Marley drive, please refer to that
drives installation manual.
Improper use of a VFD may cause damage to equipment or personal
injury. Failure to correctly install the VFD drive will automatically void
all warranties associated with the motor and any equipment that is
either electrically or mechanically (directly) attached to the VFD drive
system. The length of this warranty avoidance will be contingent on
properly installing the VFD system and repairing any damage that
may have occurred during its operation. SPX Cooling Technologies
does not assume responsibility for any technical support or damages
for problems associate with non-Marley brand VFD systems.
Changing the operational fan speed from the factory settings could
cause the fan to operate in an unstable region which may result in
damage to the equipment and possible injury.
Mechanical Equipment:
Always shut off electrical power to the tower fan motor prior to
performing any maintenance on the tower. 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 pages 19 and 20.
2. Momentarily bump (energize) the motor and observe rotation of the
fan. 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 operation. See Bushing Fastener Torque Values on page 20.
Warning
Warning
Warning
Caution
Installation