INFICON SRT-422 Crucible Indexer - Manual (Page 37)

Installation Page 35
CAUTION!
Switches 1-5 MUST he set as described above when the
SRT-422 is controlling a UHV 4-pocket source. Damage to
the source and / or its bellows are likely to occur if switches
1-4 are set for a UHV source and switch 5 is set for
unidirectional rotation There are no limits programmed for
unidirectional motion in UHV mode, as there are for
bidirectional rotation in that mode.
This mode has a programmed “software barrier” that prevents the hearth from rotating in
either direction between pocket 1 and the pocket next to it in the counterclockwise direction.
This programming serves to prevent damage to the special bellows attached to the hearth in
that location on UHV sources. To move the hearth between these two pockets, the indexer
does not simply rotate the hearth 90° along the shortest path. Instead, the hearth is rotated
270° in the opposite direction. The indexer employs shortest-path rotation when rotating the
hearth between any two other pockets.
Three-Pocket Hearths with One Banana-Shaped Pocket (Codes 10-13)
When switches 1 - 4 are set to codes 10, 11, 12 and 13, the indexer is configured for hearths
with two conventional pockets 90° apart and one banana-shaped pocket. These three codes
configure the indexer to support “bananas” of differing arc lengths.
• Code 10 sets the indexer for a three-pocket hearth with a “banana” covering 120° of arc.
• Code 11 sets the indexer for a three-pocket hearth with a “banana” covering 135° of arc.
• Code 12 sets the indexer for a three-pocket hearth with a “banana” covering 145° of arc.
• Code 13 sets the indexer for a three-pocket hearth with a ‘banana” covering 180° of arc.
The switch positions that select these codes are:
Code
Number
DIP
SW1
DIP
SW2
DIP
SW3
DIP
SW4
Code 10 OFF ON OFF ON
Code 11 ON ON OFF ON
Code 12 OFF OFF ON ON
Code 13 ON OFF ON ON
Table 3.3: Codes 10 – 13 DIP switch settings
NOTE
When switches 1-4 are set to any of these FOUR codes, switch 5 MUST
be set for bidirectional motion. If unidirectional motion is
selected, the indexer will not move the “banana” correctly.
In any of these “banana” modes, the indexer moves pockets 1 and 2 to the home
position when it receives the pocket-select codes for those pockets. When the