Commissioning and Maintenance
26 © robatherm
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Bolt Torques for Locking Bushes
Bush
type
1008
1108
1210
1215
1610
1615
2012
2017
2517
2525
3020
3030
3525
3535
4030
4040
4535
4545
5040
5050
Torque
[Nm]
6 20 20 30 50 90 115 170 190 270
Motor Removal
When removing the motor only use suitable and permitted load bearing equipment. When
using an integrated motor removal device ensure that the unit is sufficiently stable e.g. by
fixing to the foundation.
Shut Down
Remove V-belts for down times of more than 3 months to avoid concentrated stress on
bearings.
Replace bearings before recommissioning if out of operation for periods of one year or
longer, or remove grease if bearings have a regreasing device and grease bearings again.
Observe fan manufacturer's instructions.
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Determination of Belt Pretensioning Force for V-belts DIN 7753
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Belt Tension
The belt tension is measured with a suitable measuring instrument in line with instructions
(e.g. belt pretensioning force measuring instrument) and adjusted. Observe operating
instructions for measurement instrument.
Measure axle base A of the belt pulleys (in metres).
Multiply axle base by 16. The result is the belt deflection (S) in millimetres.
Apply enough force to the belt in the middle of the axle base (A) so that the calculated
deflection is reached.
Measure deflection force.
Compare deflection force (F) with table values.
Set higher values for the start up phase of new drives. Test deflection force (F) after several
hours of operation and adjust if necessary.
A – Axle base; S – Belt deflection; F – Deflection force
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