WEG Electric Motor W21Xec 80

Warning: This procedure requires trained personnel with PPE!

Is the machine in a cold state and disconnected from the power supply?

If machine is not in a cold state and disconnected from the power supply, stop the procedure

Is the insulation resistance measured in a safe environment?

Enter the insulation resistance one minute after the voltage has been applied to the winding

Ground the terminals before and after each measurement

Ground the capacitor (if any) to ensure that it is fully discharged before the measurement is taken

Enter the reading of the insulation resistance corrected to 40 °C

The motor insulation condition must be evaluated by comparing the measured value with the values indicated in Table 5.5 (corrected to 40 °C)

Motors bearing lubrication with frame sizes 63, 71, 80 are not shown inthe table

Proper lubrication plays a vital role in 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

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 6.6

The maximum operating temperature of motors used in special applications may differ from those shown in Table 6.6

The grease and oil disposal should be made in compliance with applicable laws in each country

Warning: All repair services on motors for use in hazardous areas must be performed by qualified personnel and in accordance with applicable laws and regulations.

Motor disconnected from the power supply and is completely stopped?

Motor terminals inside the terminal box free of dangerous voltages?

Motor terminals free of dangerous voltages when driven by a frequency inverter even when the motor is completely stopped?

Enclosure-protected motors, open the terminal box and/or disassemble the motor only after the enclosure surface has cooled to ambient temperature?

Record installation conditions such as terminal connection diagram and alignment or leveling conditions before starting disassembly.

Motor disassembled carefully without scratching machined surfaces or damaging threads?

Motor assembled on a flat surface ensuring a stable support base?

Footless motors fixed or locked on the base to prevent accidents?

Warning: This procedure requires trained personnel with PPE!

End shields, rotor with shaft, fan cover, fan and terminal box removed

Wound stator with frame transferred to oven for drying process

Wound stator placed in oven for two hours

Is the motor large? If yes, extend drying time

Stator cooled to room temperature after drying process

Insulation resistance measurement

Visual inspection of the motor and coupling

Check for abnormal noises, vibrations, excessive heating, wear signs, misalignment or damaged parts

Upload a photo of the damaged parts

Measure the insulation resistance

Oil spills and dust accumulation removed from the motor frame surface

Motors with potential risk for electrostatic charge accumulation cleaned with a damp cloth

Cooling fan condition checked and air inlet & outlet openings cleaned

Condition of the seals checked and replaced if required