2009 by ELTRA GmbH Germany – July 2009 – Service Manual Thermostep
Page 15
Fig. 1.10: LHS - Movesensor
1.13 Calibration of homeposition
Required tools:
2,5 mm Allenkey
The correct adjustment of the motorposition assures the optimal siting of the crucibles at the
balance pedestal. The steps that the motor should do after passing the homesensor to siting the
crucible centrally at the pedestal are adjusted here.
For a complete rotation of the caroussel the motor does 32000 steps and the distance between
two crucibles is 1600 steps. The optimal calibration is 800 steps, whereas calibrationvalues
between 600 and 1000 steps are tolerable. The siting of the first crucible directly over the
homesensor is not useful (calibrationvalue <600), because the homesensor do not detect a
single point but an area and the accurate siting of the crucible at the balance would be more
difficult.
a.)
Open form “
Motor”
(see Operation manual).
b.)
Click at
Read
. The saved calibration value is shown (before first starting up: 1). At a
calibration value of 1 the caroussel is positioned over the pedestal between two
crucibles.
c.)
Enter
800
as calibration value and confirm it by clicking at
Save
. You will get a
confirmation that the new calibration value is written to the memory.
d.)
Click at
Home
. Caroussel is rotated to position 20.
e.)
Put a crucible at the caroussel and let it move over the pedestal, by entering the
corresponding crucible position at the text box and clicking at
Go
afterwards.
f.)
Lower down the caroussel (see Operation manual: Form –
Controller
) and check if the
crucible is sited centrally at the pedestal.
g.)
If a slight displacement of the crucible at the pedestal it is needed to change the
calibration value. If the crucible is set to far lower the calibration value and vice versa.
h.)
Lift up the caroussel again.
i.)
Enter the new calibration value and save it like described at c.). Follow the
instructions again.
If correct siting of the crucibles is not possible by using a calibration value between 600
and 1000 it is necessary to adjust the carusseladaptor.
