WEG Electric Motor W21Xtb 90S

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

Stator allowed to cool to room temperature after drying process

Insulation resistance measurement

Stator drying process repeated if required insulation resistance not met

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

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.

Always use proper tools and devices for motor disassembly and assembly.

Motor disconnected from the power supply and is completely stopped?

Dangerous voltages may be present at the motor terminals inside the terminal box since capacitors can retain electrical charge even when not connected to a power source.

Dangerous voltages may be present when space heaters are connected to the motor or when motor windings are used as space heaters.

Dangerous voltages may be present at the motor terminals when driven by a frequency inverter even when the motor is completely stopped.

For enclosure-protected motors, is the terminal box opened and/or motor disassembled 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.

Disassemble the motor carefully without scratching machined surfaces or damaging threads.

Warning: This procedure requires trained personnel with PPE!

Relubricate bearings every 20000 running hours

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

Please contact WEG when motors are to be installed in special environments or used for special applications

Excess grease causes bearing overheating, resulting in bearing failure

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?

Insulate and test each phase separately

Are the other phases grounded during the test of one phase?

Disconnect and ground all external devices during the insulation resistance measurement

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

Ground the terminals before and after each measurement