INFICON XTC/C Thin Film Deposition Controller - Manual (Page 129)

4 - 25
IP
N 07
4-
18
3X
XTC/C - XTC/2 Operating Manual
4.15.1 Sensor Shutter / CrystalSwitch Output
The function of the Sensor Shutter outputs depend on the Configuration switch
settings on the back of the unit. (Refer to
Table 2-2 on page 2-20 for a list of
configuration switch setting definitions.) If a single head sensor type is chosen
the Sensor Shutter relay contacts are set to be Normally Open. The Sensor
Shutter relay contacts close (opening the shutter) when entering the Deposit
state, Shutter Delay state, or during the Sample period of the RateWatcher
function.
If a Dual sensor type is chosen, the Sensor Shutter relay now functions as a
CrystalSwitch relay. The contacts are set to be Normally Open. The Sensor
Shutter relay contacts close upon initiating a CrystalSwitch. This actuates the
shutter mechanism, toggling the shutter, exposing Sensor 2’s crystal and
covering Sensor 1’s crystal. A second CrystalSwitch function will open the
contacts, toggling the shutter, exposing Sensor 1’s crystal and covering Sensor
2’s crystal. Due to the change in function of the relay output from that of Sensor
Shutter to one of CrystalSwitch, RateWatcher is disabled when the unit is
configured for a Dual sensor.
NOTE: When configured for a dual sensor, sensor 1’s shutter relay is used for
the CrystalSwitch function. Sensor 2’s shutter relay is disabled.
If a CrystalSix sensor type is chosen the Sensor Shutter relay functions as a
CrystalSwitch relay. The operation of the relay contacts is different than when
the sensor is a Dual head. In this case the relay contacts are pulsed closed for
one second, opened for one second, closed for one second, then opened.
When connected properly, the first one second closure will advance the
CrystalSix carousel into an intermediate position between two crystals.
Opening the closure for one second allows the ratchet mechanism to relax
whereupon the second contact closure advances the next crystal into the
proper position. The intermediate position between two crystals is important in
automatically verifying the proper operation of the CrystalSix sensor head. Due
to the change in function of the relay output from that of Sensor Shutter to one
of CrystalSwitch, RateWatcher is disabled when the unit is configured for a
CrystalSix sensor.