WEG Electric Motor W21Xec 71

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

Enter the measured insulation resistance

Warning: This procedure requires trained personnel with PPE!

Ensure the machine is in a cold state and disconnected from the power supply

Ensure the insulation resistance is measured in a safe environment

Is each phase insulated and tested separately?

During the test of one phase, the other phases must be grounded

All external devices must be disconnected and grounded 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

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

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

Motor cleaned carefully to prevent electrostatic discharge

Cooling fan condition checked and air inlet & outlet openings cleaned

Condition of the seals checked and replaced if required

Warning: Proper lubrication plays a vital role in motor performance

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: 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 windings used as space heaters 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 cooled to ambient temperature before opening the terminal box and/or disassembling the motor?

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?