51
VTS reserves the right to implement changes without prior notice
Ventus Air Handling Units
Please follow the safety regulations below:
- disconnect power supply,
- apply protection module against unintended switching on the device,
- check if source of power supply is not in contact with the device in any way,
- apply covers for neighboring live devices.
All precautions listed above should be maintained till all maintenance activities are finished and the
motor is fully assembled and ready for work.
In case of fan's motor maintenance activities check if:
- designed technical data are met (power consumption, winding and bearing temperature),
- grease leakage occur,
- the motor operates correctly and if there are any noises related to the motor and bearings
operation,
- all mechanical and electric connections are firmly fixed,
- windings' resistance is correct,
- cables and insulation is in a good condition and if there are no changes in their color.
Any noticed changes and abnormalities should be fixed immediately. And what is more:
- check the bearings according to the point describing checking the fan's bearings,
- check if the motor is firmly installed and fastening screws tighten up,
- check contamination level of the motor casing.
Excessive contamination deteriorates motor's cooling and in turn it can lead to overheating of the
motor's winding and its damage. The motor can be cleaned with a dry brush or blow through with
compressed air.
MOTOR'S BEARINGS
Motors as standard are equipped with ball bearings of 62.... series which are equipped with a shield.
During bearing replacement or lubrication the motor must be disassembled. While doing so all
individual parts must be clearly marked according to disassembling order. For disassembly of
aligned elements a puller or other appropriate tool must be used.
Remove the bearing, clean the shaft's pin, clean or replace the bearing and install it with new
grease. The bearing should be evenly heated till it reaches 80-100ºC and then push it. Avoid strong
blows (e.g. with a hammer). All worn sealing elements should also be replaced.
All empty bearing spaces should be filled with grease. In order to avoid too excessive lubrication, do
not apply grease onto bearing casing and covers.
In case of motors operating in rated conditions at ambient temperature up to 40ºC grease life is:
- about 20 000 working hours for rotation speed up to 1500 rpm
- about 10 000 working hours for rotation speed up to 3000 rpm For operation at 25ºC these times
are longer by about 100%.
Regardless of number of working hours, grease should be replaced every 3 years due to ageing
effect. In such a case the bearing should be disassembled from the motor, cleaned and lubricated
again.
Type of grease used for motor bearing:
ESSO/UNIREX N3
.
Provided grease life and lubrication intervals correspond to this grease only.
Do not mix different grease types!
