WEG Electric Motor W21Xec 90S

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

Insulate and test each phase separately

Ground the other phases 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

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

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?

Upload a photo of installation conditions such as terminal connection diagram and alignment or leveling conditions before starting disassembly.

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?

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

Warning: This procedure requires trained personnel with PPE!

Relubricate bearings every 20000 running hours

Add grease (4g for frame size 90, 11g for frame size 132)

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

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

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