Mechanical Equipment | SPX Cooling Technologies none instruction

Warning

Caution

Installation

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.