SPX Cooling Technologies Fluid Cooler Marley MC - Manual (Page 11)

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 fluid 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