Maintenance of Fan / Blower (Cont.)
2.) Cleanliness - Keep both the interior and exterior of the motor free from dirt, water, oil and grease.
3.) Safety - Motors should be installed, protected and fused in accordance with latest issue of National Electrical Code, NEMA Standard Publication No. MG2 and local codes. Rotating parts such as pulleys, coupling, external fans, and unusual shaft extensions should be permanently guarded. Keep hands and clothing away from moving parts. Electrical repairs should be made by trained, qualified personnel only.
4.) Location - The free flow of air around the motor should not be obstructed. The motor should never be placed in a room with hazardous processes, or where flammable gases or combustible material may be present, unless it is specifically designed for this type of service.
5.) V-Belt Drive -
A.) Align sheaves carefully to avoid axial thrust on motor bearing. The drive sheave on the motor should be positioned toward the motor so it is as close as possible to the bearing.
B.) When adjusting belt tension, make sure the motor is secured by all mounting bolts before tightening belts.
C.) Adjust belt tension to belt manufacturers recommendations. Excessive tension will shorten bearing life. Insufficient tension shortens bearing life, can reduce fan performance and may cause vibration. Belts may slip during
speed. |
|
| Set screw ‘X’ locks |
|
|
|
|
|
|
| Key “E” locks moveable | |
|
|
|
|
|
|
|
|
| Y | |||
|
|
| sheave to motor shaft. |
|
|
|
|
|
| side(s) of sheave after | ||
Replacement Belt Part Numbers | X |
|
|
|
|
|
|
| E | pulley has been adjusted. | ||
|
|
|
|
|
|
| ||||||
|
|
|
|
|
|
| Do not operate | |||||
|
|
|
|
|
| |||||||
10hp | B44 Belt | BLZ440000 |
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
| D | Sheave with flange | |||
|
|
|
|
|
|
|
|
|
|
| projecting beyond | |
15hp | BX44 Belt | BLZ440001 |
|
|
|
|
|
|
|
|
| the hub end. |
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
|
C
D.) Sheaves should be in accordance to NEMA Spec.
Adjusting:
1.) Loosen setscrews “Y” and “C” in moving parts of sheave. Turn pulley so Key ‘E’ drops down & out of the way.
2.) Adjust sheave pitch diameter for desired speed by opening moving parts 1/2 or full turns from closed position. Do not open more than six full turns for “B” belts.
3.) Tighten setscrew “Y” over key and setscrew “C” over flat surface machined into sheave center hub. Torque set screws to the following values: 100 in. lbs. minimum to 130 in. lbs. maximum.
4.) Put on belts after elevating motor mount plate and adjust belt tension to proper value. Do not force belts over grooves.)
5.) Future adjustments should be made by loosening the belt tension and increasing or decreasing the pitch diameter of the sheave by half or full turns as required. Readjust belt tension before starting drive.
6.) Be sure that all keys are in place and that all setscrews are torqued properly before starting drive. Check setscrews and belt tension after 24 hours of service.
7.) Replace shaft and pulley guards covers.
6.) Condensation Drain Plugs - All explosion proof and totally enclosed motors are equipped with automatic drain plugs, which should be kept free of oil, grease, paint, grit and dirt. The drain system is designed for normal floor (feet down) mounting. For other mounting positions, modification of the drain system may be required. Consult the manufacturer.
7.) The factory installed bearings in the motor are double shielded (permanently sealed), pre- |
|
lubricated, ball bearings without grease fittings and don’t need relubrication. The bearing part |
|
numbers are as follows: Drive End / 6309ZZ, Opposite Drive End / 6307ZZ. If the bearings ever |
|
need replacing, the motor should be taken to an EASA (Electrical Apparatus Service Association) |
|
certified shop to ensure proper installation. | 14 |
|
10 HP Pulley Drive Owner’s Manual c O.A.S. 2007