9
The belt tension can be measured only when the drive has been shut down and is sta-
tionary. The fitted and taut drive belt is tapped in order to make it oscillate with its natural
oscillation. This static natural frequency is then measured by the probe with the aid of
pulsed light. Care must be taken to ensure that the light is sufficiently reflected by the
belt. The measured values are displayed in hertz. Entering the belt mass and belt length
is not necessary.
- Tap the drive belt so that it begins to oscillate with its natural oscillation.
- Hold the measuring probe approximately at the center of the free strand length at a
distance of about 3 to 20 mm above the drive belt.
- Successful measurement is acknowledged by an acoustic signal and the indication
“Measurement” appears on the display.
- The measured value is displayed in Hz.
To measure the belt tension:
- Switch on the instrument.
- Set the instrument parameters as described in Chapter 3.4 Menu Structure on page 8.
Attention!
The belt tension can be measured only when the drive has been
SHUT DOWN and is STATIONARY.
Preferably, the belt
tension should
always be mea-
sured at the center
of the longer belt
strand between the
two drive pulleys.
The distance between the drive
belt and the measuring probe
should be between 3 and 20 mm.
Drive belts expand after mounting. Therefore the belt should be mounted 30%
above the calculated strand force value. Check again after one hour.
Measurement deviations of up to +/- 10% for several measurements taken on the
same drive belt are as a rule not caused by a measurement error or fault in the
unit. In most cases, measurement deviations are due to the mechanical toler-
ances of the drive systems.
Recommendation: Repeat the measuring 3 - 5 times and use the average as
measuring value.
3.5 Measuring the Strand Force
3.5.1 Measuring the Belt Frequency in Hertz
