5.4.5 The Private\Carousel Menu
Private.....Carousel
Current Stop: d
Demand Stop: d
ABORT SLEW
SLEW
Current Pos:
±
ddddd
Index: BLOCKED
STEP DOWN
STEP UP
The Carousel menu allows the user to completely control the Carousel and to display
the Carousel's current position.
NOTE
Carousel is a model-dependent item. It appears in the Private menu only if the unit’s model
number is set to a carousel model in the Configuration\Advanced\Changer\Mechanics menu
(model 4222, 4440, 4480, 4660, or 46120).
Some items in the Private\Carousel menu are function-dependent items. For example, ABORT
and SLEW only appear while the Carousel is busy.
General Carousel Information
The Carousel is moved by a four-phase, DC stepper motor. There are 200 steps per
motor shaft revolution. A pinion gear on the motor shaft drives the carousel gear,
which is housed inside the gear guard.
The gear guard contains indexing slots, which are placed in a specific pattern. Since
carousels have either four or six faces, the gear guard has indexing slots for each face,
including a single, extra-wide indexing slot. These slots are sensed by the Carousel
Position sensor.
The Carousel Position sensor is an optical switch pair, mounted on the carousel PCBA
(P/N 500617-01-4). As the gear guard rotates, it passes between the sensor's emitter
and detector, interrupting the sensor’s beam. As each indexing slot in the gear guard
passes through the sensor, it allows the sensor’s beam to reach the detector. The pat-
tern of indexing slots that the detector sees is used to determine the Carousel's posi-
tion. The extra-wide indexing slot is used to establish an absolute position reference.
Table 5-1 shows the relationship between carousel face Stop numbers and the corre-
sponding carousel faces for each TLS model. It also shows the number of motor shaft
rotation steps required to move counterclockwise from Stop 0 (the face 1 stop) to each
Stop number. Counterclockwise rotation, as viewed from above, is the forward direc-
tion of rotation (position step increments).
5-12
The Private Menu
501380 Rev. B
