INFICON SRT-422 Crucible Indexer - Manual (Page 24)

Page 22 Operation
of interlock action or because the indexer has been switched off. As Table 3-i shows, the
speed of this oscillating motion depends on which of the pocket-select codes between 3 and 7
is received. The pocket-select code for pocket 8 causes the hearth to rotate the midpoint of the
banana to the home position and then stop. Note that this means that the electron beam will be
focused on the same point continuously until it is switched off or until another pocket is
selected.
How the speed of oscillating hearth motion in “banana” mode varies depending on the pocket
number selected
Pocket Selected Hearth Rotation Speed
3 .630 RPM
4 .515 RPM
5 .405 RPM
6 .295 RPM
7 .187 RPM
8 0 RPM
Table 2.1: Speed of Hearth in Banana Mode.
NOTE
When the indexer is configured for “banana” mode operation, internal DIP switch 5 MUST be
set for bidirectional motion. If unidirectional motion is selected, the indexer will not move the
banana-shaped pocket correctly.
Section 2.9: Indexer operation with continuous trough hearths
The SRT-422 operates in a continuous-rotation mode to support the use of full-circle evaporant
carousels (see Figure 3-6). When the indexer is properly configured for operation in this mode,
the hearth rotates continuously at any of 7 speeds in the direction determined by internal D[P
switch #5. (See section 2.3 for instructions on setting the internal DIP switches.) As the hearth
rotates, the LED displays the numerals 1-4 successively and then begins again with 1. These
numerals indicate motion relative to what would be the home position of pocket 1 on a 4-
pocket source.
Continuous
(code 9)
Figure 2.6: Illustration of a continuous-trough hearth