Maintenance; General Inspection; Lubrication - WEG W22 Premium E3 Manual De Instalación, Operación Y Mantenimiento

8. MAINTENANCE

The purpose of the maintenance is to extend the useful life of the equipment. The non-compliance with one of
these previous items can cause unexpected machine failures.
If motors with cylindrical roller or angular contact bearings are to be transported during the maintenance
procedures, the shaft locking device must always be fitted. All HGF motors, regardless of the bearing type,
must always be transported with the shaft locking device fitted.
All repairs, disassembly and assembly related services must be carried out only by qualified and well-trained
personnel by using proper tools and techniques. Make sure that the machine has stopped and it is
disconnected from the power supply, including the accessory devices (space heater, brake, etc.), before any
servicing is undertaken.
The company does not assume any responsibility or liability for repair services or maintenance operations to
motor for use in hazardous areas executed by non-authorized Service Centers or by non qualified service
personnel. The company shall have no obligation or liability whatsoever to the buyer for any indirect, special,
consequential or incidental loss or damage caused or arising from the company's proven negligence.
Repairs to motor for use in hazardous areas must be executed in accordance with the applicable standards.

8.1. GENERAL INSPECTION

The inspection intervals depend on the motor type, application and installation conditions. Proceed as follows
during inspection:
Visually inspect the motor and coupling. Check if abnormal noises, vibrations, excessive heating, wear signs,
g
misalignment or damaged parts are noticed. Replace the damaged parts as required.
Measure the insulation resistance according to the item 5.4.
g
Clean the motor enclosure. Remove oil spills and dust accumulation from the motor frame surface to
ensure a better heat transfer to the surrounding ambient. Motors with potential risk for electrostatic charge
accumulation, duly identified, must be cleaned carefully by using a damp cloth to prevent electrostatic
discharge during maintenance interventions.
Check cooling fan condition and clean the air inlet & outlet openings to ensure a free air flow over the motor.
g
Investigate the actual condition of the seals and replace them, if required.
g
Drain the condensed water from inside the motor. After draining, reinstall the drain plugs to ensure the degree
g
of protection as indicated on the motor nameplate. The motor must always be positioned so the drain hole is
at the lowest position (see item 6).
Check the connections of the power supply cables, ensuring the correct clearance distance between live and
g
grounded parts, as specified in Table 6-2.
Check if the tightening torque of the bolted connections and mounting bolts meets the tightening torque
g
specified in Table 8 8.
Check the status of the cable passages, the cable gland seals and the seals inside the terminal box and
g
replace them, if required.
Check the bearing operating conditions. Check for the presence of any abnormal noise, vibration or other
g
abnormal operating conditions, like motor temperature rise. Check the oil level, the lube oil condition and
compare the workings hours with the informed life time.
For explosion-proof motors check if the gap between the components is according to the Table 8-7. The
g
tolerance class of the metric threads for the cable inlet must be 6H or better.
Record and file all changes performed on the motor.
g
Do not reuse damaged or worn parts. Damaged or worn parts must be replaced by parts supplied by
the manufacturer and must be installed as if they were the original parts.

8.2. LUBRICATION

Proper lubrication plays a vital role in the motor performance. Only use the grease or oil types, amounts and
lubrication intervals recommended for the bearings. This information is available on the motor nameplate and
the lubrication procedures must be carried out according to the type of lubricant (oil or grease).
When the motor is fitted with thermal protection devices for bearing temperature control, consider the operating
temperature limits shown in Table 6.3.
The maximum operating temperature of motors used in special applications may differ from those shown in
Table 6.3. The grease and oil disposal should be made in compliance with applicable laws in each country
www.weg.net
Manual of Electric Motors 111