WEG Electric Motor W21Xec 90L

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 heated to max. 120 °C for two hours

Stator allowed to cool to room temperature after drying process

Measure the insulation resistance

Stator drying process repeated if required insulation resistance does not meet specified values

Causes of insulation resistance drop evaluated if insulation resistance does not improve despite several drying processes

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?

Warning: This procedure requires trained personnel with PPE!

This procedure is for Motors W21Xec / W21Xtb, frame sizes 90 and 132

Relubricate bearings every 20000 running hours

Add 4 g of grease for frame size 90

Add 11 g of grease for frame size 132

Only use the grease or oil types, amounts and lubrication intervals recommended for the bearings

Lubrication procedures must be carried out according to the type of lubricant (oil or grease)

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

Visual inspection of the motor and coupling

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

Insulation resistance measurement

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!

The machine must be in a cold state and disconnected from the power supply.

The insulation resistance must be measured in a safe environment.

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

Is the environment safe for insulation resistance measurement?

It is recommended to insulate and test each phase separately.

Is each phase insulated and tested separately?

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

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