D397-01-880 Issue E
Page 14
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Installation
CAUTION
If quoted rating is exceeded, equipment specifications are not valid.
CAUTION
To connect a capacitance manometer gauge to a TIC, a special cable, that includes an identification resistor, is
required. These are Edwards part numbers D40003030 for Model 622 and D40003050 for all other models. If the
cable is not used, the gauge will be damaged.
CAUTION
To ensure capacitance manometer gauge protection, a minimum time of 1 second is required between
disconnecting an alternative gauge type from that port and connecting the capacitance manometer.
3.3.4
Connecting the logic interface
3.3.4.1
Introduction
Note:
In most applications, to prevent earth loops inadvertently occurring, it is preferable not to earth the logic
interface power supply common.
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 to monitor the status of the vacuum system and to
control 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.
Table 9 - Logic connector Edwards accessories
Model
Power
3 Output Relay Box (D397-00-804)
0.75 W
6 Output Relay Box (D397-01-804)
1.5 W
Profibus Modules (D397-50-000)
5 W
