7. Mechanical System
2004-10
Technical Manual for sunrise RC, TW, TS, TC, BC, 6F No. T 137 302 Rev No. 1.1
7-1
7. Mechanical System
7.1 Introduction
This chapter contains the description of the transport system and how the parts
are to be replaced and adjusted.
7.2 Transport System Description
The plate support is moved by a stepper motor via the transport belt.
When the motor is rotated by one step, the plate support is moved 0.0875 mm.
The positioning is controlled by two optical switches: Start and End optical
switches.
The Start optical switch is mainly used to set the transport to a zero position,
from which the number of steps that are to be performed for positioning the
microplate under the measuring diodes, are counted.
The End optical switch is only used if inside shaking is performed before a
measurement. During a normal measurement procedure the End optical switch
is not used.
The distance between the End and the Start optical switches is measured in
steps during the machine set up. The number of steps is stored in the
instrument's memory.
The measured number of steps is stored so that the inner sensor can be used
for zero calibration after inside shaking has been performed.
This distance can be recalibrated in the Service program using the submenu
Calibrate Length.
7.3 Measurement
Procedure
When the measurement procedure is started, the transport system is moved to
the Start optical switch.
The plate support moves back and forth under the measuring diodes. The
measurements are performed after a certain number of steps.
After the measurement has been completed, the plate support is returned to the
Start optical switch and the instrument checks the number of steps required to
reach the Start optical switch. This has to be the same as the number of steps
used to measure the microplate.
If the number of steps are different, the instrument displays a transport error
message and the measured results are ignored.
