Control And Tightening Of The Driving Belt (Poly-V Belt System) - h/p/cosmos 150/50 mercury Operating And Service Manual

Note: For running machines with a running surface of 200 x 75 cm and bigger, the trimming screw is located at the front
drive shaft. In this case the running belt movement is in the opposite direction after turning the screws.
The allen key must be pulled out of the screw immediately after use due to risk of injury!
The oversize machine h/p/cosmos saturn 450/300rs has an automatic belt centering system with motors and sensors
and does not need to be centered manually; however, the user should observe the central belt position.
8.7

Control and tightening of the driving belt (poly-V belt system)

The correct tension of the driving belt is very important for proper operation of the running machine. If the tension is too
high, this may cause defects of the motor and roller bearings. Too low tension results in the backlash of the drive belt
and therefore in higher abrasion and power losses.
The poly-V belt is provided with a belt adjuster and normally requires very little tightening. The belt adjuster offers the
possibility of readjustment.
Attention: Dangerous gap/capture area at the tail shaft at the back of the device (belt re-entry
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zone). Take care that long hair and loose clothing are not caught in the gap of the tail shaft.
For safety reasons, the adjustment procedure must be attended by a second person who can
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immediately press the emergency stop button in an emergency.
Switch off the running machine and pull the mains plug before intervening.
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8.7.1 Checking the tension of the driving belt with the "slipping-test"
The "slipping-test" can detect if the drive belt has too low tension. The "frequency-test" must be used (see next point) to
exclude too high tension. The driving belt tension is checked as the running belt tension:
Block the running belt at a speed of 1 - 1.5 km/h.
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Ensure that there is no backlash between the motor shaft and the driving belt.
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Ensure that the tension at the bottom run (see picture) is between 98 Hz and 103 Hz (frequency at
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oscillation).
The noise at higher speeds and the correct course on the pinion should be considered.
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8.7.2 Checking the tension of the driving belt with the frequency test
Check the belt tension with measuring device for belt tension [cos14863]:
Switch off the running machine at the main switch.
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Visually inspect the drive belt for abrasion and
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correct fitting.
Switch on the tuning device.
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Ensure that the tuning device is in „BASS" mode,
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change with button GUITAR/BASS.
Hold the tuning device with the microphone (MIC)
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close to the bottom run of the drive belt and pick the
run (see picture).
The tension of the drive belt at the bottom run (see
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picture) should be between 98 Hz and 103 Hz
(frequency during oscillation).
Check the tone in the display: target = 1G – adjust
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the tension of the drive belt if necessary.
Check the amplitude of the needle: target 440 ... 460 – adjust the tension of the drive belt if necessary.
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When the tuning device indicates the tone 1G and an amplitude of the needle of 440 ... 460, the tension of the
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drive belt is OK.
© 2012 h/p/cosmos sports & medical gmbh
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maintenance and safety inspections
upper belt run
bottom belt run/ place to pick
created 04.05.2012 printed 04.05.2012 page: 108 of 191