INFICON SRT-422 Crucible Indexer - Manual (Page 47)

Installation Page 45
5 Switch the indexer on and off rapidly, watching the hearth move a small amount
each time you do so. When pocket 1 is centered in the cutout, leave the indexer
switched off.
6 Using the end of a paper clip or some other small-diameter probe. push in the
spring-loaded phase adjustment pushbutton and keep it depressed as you
switch on the indexer and as the hearth goes through its initialization routine.
(This routine involves what may appear to be random rotation.) Release the
pushbutton only after the hearth has returned to the new home position for
pocket 1 and stopped. If this is not the correct home position, switch off the
indexer and repeat steps 5 and 6.
7 Use the pocket selection thumbwheel to change pockets several times,
checking to see that each pocket goes to the correct home position. If the
hearth does not remain properly in phase, return to pocket 1 and repeat steps
5-7.
Section 3.13: making system connections via the rear panel I/O interface
The I/O (ISOLATED) connector on the control unit’s rear panel provides an opto-isolated
interface for exchanging digital signals with other system components. The user must supply
cabling between this connector and external devices. The figure below identifies the signals
that can be exchanged via this connector and shows the function of each pins Power for the
I/Os can be either internally or externally supplied. If internally supplied, the I/Os are -9 Vdc
when low and +9 Vdc when high. If externally supplied, they are 0 Vdc when low and +24 Vdc
when high. Outputs are limited by the indexer’s internal circuitry to a maximum of 10 ma per
output. If you use the internal +/- 9 Vdc supply, connect pin 1 4 on the I/O connector as the
ground. If an external +24 Vdc is supplied, connect pin 15 as the ground.
Interlock Connections
One of two signals (either the POCKET GOOD output or the system interlock input) must be
connected to provide an interlock that will prevent the e-beam from damaging portions of the
hearth while it is rotating. The POCKET GOOD output is high as long as a given pocket is
within 5° of the calibrated home position. To use this signal as the indexer’s interlock, connect
pin 5 on the I/O connector to the electron beam power supply in such a way that the power
supply is switched off when POCKET GOOD goes low. If you are using a Temescal Simba 2
power supply, connect this wire to the input for the power supply’s AUXiliary interlock. Refer to
the Simba 2 manual for detailed instructions.
Alternatively, if a system interlock signal is input via pin 3, the signal high when as it is not safe
for the hearth to rotate. Such an interlock would prevent hearth rotation when the e-beam is
on. However, this arrangement would not protect the source from damage if the hearth should
get severely out of phase.