WEGER WALTER GMBH DIWER EVO DP80 Series, Installation And Operating Manual

Page: 49 / 64

Installation and Operating Manual Page
47
Printed: 02/2015
If the belt is too tight, the bearings of the fan and/or the motor might be damaged. If the belt
tension is too low, the V-belt is exposed to excessive wear and the machine's efficiency is
impaired.
Replacement of the V-belts
When changing the V-belts, loosen the belt tensioning device until the belts can be easily
removed. Before installing the new belts, clean the pulleys.
Ensure that the new belt can be mounted on the pulleys without the need of force. Tension
the belts as described above.
In machines with multiple V-belts, always replace the entire set of V-belts together.
Further ensure that all belts are of the same length. Before tightening the belts, ensure that
their slack sections are in the same position.
7.2.3. Flat belt drive
To ensure trouble-free operation of the flat belt drive, ensure the following:
- The pulleys are clean.
- The shafts are parallel to each other.
- The vertices of the pulley curves must be aligned to each other.
- The belt is running in the correct direction.
- The pulleys must be aligned in all directions
Installation and tensioning
Unless already in place, mark to measuring points 500 mm apart from each other on the slack
flat belt.
Mount the flat belt and stretch it until the distance between the two measuring marks has
increased by the required factor (e.g. by 2% = 510 mm).
During tensioning, turn the drive by hand and prevent the belt from slipping by adjusting the
motor slide position. After tensioning, recheck the pulley alignment.
After prolonged standstill, the drive should be loosened to protect the drive, bearings and the
belt. After one hour of operating time the tension and alignment of the flat belt and pulleys
must be checked and adjusted if necessary.
After one hour operating time control the tension and the alignment and if necessary regulate
it again.