2009 by ELTRA GmbH Germany – July 2009 – Service Manual Thermostep
Page 13
a.)
Activate the blower at form “
Controller”
(see Operation manual) to lift it up and check
speed of lifting up and closing.
Fig. .1.8.: FI - Internal Blower (lifted up)
b.)
Adjust the speed of lifting up by using the upper choke at the 1. valve of the
valveblock at the LHS.
c.)
Adjust the speed of discharging by using the lower choke at the 1. valve of the
valveblock at the LHS.
d.)
Lock the adjustment via the counter nuts.
e.)
Check speed after locking again as described at a.).
1.12 Motorsensors
Required tools:
8 mm open-end wrench
The analyser uses a stepper motor that is controlled via two sensors, the home sensor and the
move sensor. The homesensor coordinates the rotation of the carousel and the positioning of
the crucibles at the balance pedestal. At this the encoding screw, that is fitted onto the
encoding plate, serves as start- and endpoint of a rotation. During rotation of the encoding-
screw the sensor completes the revolution and starts to incorporate the steps of the new
revolution.
The home sensor (horizontal arrangement) is located at the LHS at reach of the encoding
plate, that rotates simultanously with every carousel revolution and is fixed at the
carouseladaptor. The homeposition is defined by the encodingscrew fitted at the
encodingplate. For recognition of the encoding screw the distance of the homesensor should
be as low as possible. At optimal alignment a sheet of paper (80g) should fit between sensor
and encoding screw. Plese note that the scew has a wide surface area. A collision between
screw and sensor has to be avoided at any time!
The distance and the vertical position of homesensor is adjustable.
