BUCHI Syncor Polyvap User Manual
Page 30
Syncore
Platform
30
Figure 23: Unbalance compensation
5 Operation
Checking the setting
The new setting must be checked every time the eccentricity
has been changed.
The tool must be removed from the unit. The vortex movement
must not be switched ON while the tool is still in the drive. This
could cause damage to the unit and lead to personal injuries.
Make a qualitative check by evaluating the swirl in a liquid
within a sample tube at the new setting.
Adjust the unbalance compensation before checking. Refer
to the Chapter „Unbalance compensation.“
In addition, the eccentricity can be measured with a millimeter
gauge based on the travel of the base plate during one rota-
tion. An eccentricity of 5 mm corresponds to a travel of the
base plate of 10 mm along a straight line. To measure this,
lay a piece of paper on the rubber covering of the unit and
let the unit run at 60 RPM. Holding a felt-tip pen against the
edge of the heating plate, move the pen down until it traces
a circle on the paper. The radius of the circle corresponds
to the eccen tricity that has been set.
5.13 Unbalance compensation
Introduction
The unbalance compensation is used to change the distance
of a balancing weight from the horizontal axis of the
vortex movement. This balancing weight makes compensa-
tion for the moving masses of the base plate and the rack
fastened to it. Such compensation is absolutely necessary
to ensure smooth and safe operation.
The greater the weight of the base plate, with the accesso-
ries and samples on it, and the greater the eccentricity of
the vortex movement, the farther the balancing weight must
be from the axis.
A missing or incorrect adjustment of the unbalance compen-
sation can result in rough operation and strong vibrations.
If that is the case, stop or reduce the vortex movement
imme diately and adjust the settings.