INFICON SRT-422 Crucible Indexer - Manual (Page 22)

Page 20 Operation
Source rotation can be either uni- or bidirectional if you select unidirectional rotation, you can
also select clockwise or counterclockwise rotation. If you select bidirectional rotation, the unit
will index to the selected pocket by the shortest path, whether that means rotating clockwise or
counterclockwise. Bear in mind that both uni- and bidirectional modes, the orientation of pocket
numbering depends on whether clockwise or counterclockwise rotation is selected.
Notes on This Operating Mode
1. When the indexer is configured for a standard 4-pocket source, selecting pocket
positions 1-4 moves the hearth to pockets 1-4, respectively. In addition,
Selecting pocket 5 moves the hearth to pocket 1, as indicated by the LED
Selecting pocket 6 moves the hearth to pocket 2, as indicated by the LED
Selecting pocket 7 moves the hearth to pocket 3, as indicated by the LED
Selecting pocket 8 moves the hearth to pocket 4, as indicated by the LED.
2. When the indexer is configured for a standard 6-pocket source, selecting pocket
positions 1-6 moves the hearth to pockets 1 -6, respectively. In addition, selecting either
pocket 7 or pocket S moves the hearth to pocket 1 , as indicated by the LED.
3. When the indexer is configured for a standard 8-pocket source, selecting pocket
positions 1 -8 moves the hearth to pockets 1-8, respectively. However, note that the
LED displays a zero rather than an 8 when the hearth is at pocket 8.
Section 2.7: Indexer operation with 4-pocket UHV sources
The distinguishing operating characteristic of the indexer in this mode is that it will not move
directly in either direction between pocket 1 and the pocket 90° counterclockwise from pocket
1. (The unit’s software may be thinking of the latter pocket as either pocket 2 or pocket 4.
depending on the primary rotation direction. This ‘software barrier” prevents damage to the
special bellows that is attached in this location to the hearth of a 4-pocket UHV source.
Consequently, the indexer rotates 270° to go between these two pockets in either direction.
However, because this operating mode requires the indexer to be set for bidirectional rotation,
it follows the shortest path in moving between any other pair of pockets.
CAUTION!
The indexer MUST be configured for bidirectional rotation when it is
controlling a UHV 4-pocket source. Damage to the source and/or its
bellows is likely to occur if the unit is configured for unidirectional motion.
There are no limits programmed for unidirectional motion in UIIV mode, as
there are for bidirectional motion in UHV mode.