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Page 13
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Installation
D397-21-880 Issue G
3.3.3
Connecting an active gauge
CAUTION
Do not connect Barocel capacitance manometers to the TIC. Doing so will result in damage to the gauge and will
invalidate the warranty.
Up to three compatible active gauges can be fitted to the gauge connectors on the rear panel. Connect the gauges
using Edwards active gauge cables to each of the three gauge sockets on the rear of the TIC.
Note:
Only one AIGX gauge can be connected to the TIC at a time.
3.3.4
Connecting the logic interface
3.3.4.1
Introduction
Note:
In most applications it will be preferable not to earth the logic interface power supply common to prevent
earth loops inadvertently occurring.
CAUTION
Do not connect voltages greater than 24 V to the logic interface.
The logic interface provides a number of signals that can be used for monitoring the status of your vacuum system,
and for controlling certain aspects of its operation. These signals can be broadly divided into two groups, control
inputs and status outputs.
3.3.4.2
Using control inputs
Control inputs provide a means of controlling the operation of the TIC and the associated vacuum system from
external sources.
Gauge 1, 2, 3 Enable Pins 9, 20, 21): The gauge enable inputs can be used to control the operation of the gauges. If
gauge enable is open, the associated gauge cannot be turned on, and will turn off if it is operating. To enable the
gauges, connect the required gauge enable line to 0 V.
Note:
Only gauges that can be turned on and off will respond to this input. Refer to the gauge manual for further
details.
SYSI: The System interlock input can be used to interlock the TIC to a system fail or control signal. When 'SYSI' is open,
all gauges will turn off. The TIC will also trip into the fail condition. To clear the system interlock and allow the
gauges to start, connect 'SYSI' to 0 V.
Note:
Only gauges that can be turned on and off will respond to this input. Refer to the gauge manual for further
details.
3.3.4.3
Using status outputs
Status outputs provide a means for external systems to react based upon the current state of the TIC.
Relay setpoints: The setpoint outputs can be used to interface to external logic or can be used to drive relays. Each
output can be configured in software to activate at a certain pressure. Refer to
these outputs. Each relay can be manually controlled. Refer to
.
WARNING
’SYSI’ is not fail safe and should not be relied upon for safety critical applications.
