WEG Electric Motor W21Xtb 90L

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 environment safe for insulation resistance measurement?

If the environment is not safe, stop the procedure and report to the supervisor

Are all external devices disconnected and grounded?

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

Enter the applied voltage as per Table 5.3

Ground the terminals before and after each measurement

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

Stator placed in oven for two hours

Is the motor large? If yes, extend drying time

Stator cooled to room temperature after drying

Enter the measured insulation resistance

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 surface cooled to ambient temperature before opening the terminal box or disassembling the motor?

Record installation conditions such as terminal connection diagram and alignment or leveling conditions

Motor disassembled 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?

Motor handled carefully to avoid damaging insulated components such as windings, insulated rolling bearings and power cables?

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 investigated and replaced if required

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

Excess grease causes bearing overheating, resulting in bearing failure

For each increment of 15 °C above the room temperature, the relubrication intervals given in the Table must be halved