© Edwards Limited 2008. All rights reserved.
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Introduction
D396-14-880 Issue J
1.5
Connection of an Active gauge
Note:
If you connect an Edwards Active gauge to operate the TMPI control input signal to the logic interface, you
cannot also use another signal to operate the TMPI control input.
You can directly connect an Edwards Active gauge to the Controller (refer to
for suitable gauges). For
example:
z
You can use the set-point facility of an APG Active Pirani Gauge or an ATC Active Thermocouple Gauge
(which is used to measure system or backing pressure) to operate the TMPI control input signal to the logic
interface.
z
You can connect an AIM Active Inverted Magnetron Gauge and use the Controller TMP Normal signal to switch
the gauge on. This allows you to control the AIM Gauge without the need to use an additional high pressure
gauge (and its associated control equipment) to interlock the operation of the AIM Gauge to system pressure.
for details of the connection of an Active gauge to the Controller.
If you want to use any alternative gauges, you must connect the gauge to its associated control equipment and then
connect the set-point output of the control equipment to the logic interface.
1.6
Backing pump control (EXC120/300/300M only)
The EXC120, EXC300 and EXC300M Controllers can be used to control the operation of a backing pump through a
backing pump relay. The operation of this relay depends on how you have configured the Controller to operate the
vent-valve: refer to Sections
and
1.7
Logic interface
1.7.1
Introduction
The rear panel of the Controller has a logic interface connector (see Figures
to
) which you can use to connect the
Controller to your own equipment. The EXC120 and EXC120E Controllers have a 17-way connector and the EXC300
and EXC300M Controllers have an 18-way connector.
Signals on the logic interface are of four types:
and
for detailed information about the logic interface pins and their uses. A
general description of the logic interface connections follows.
z
Electrical supplies
These are electrical supplies for accessories connected to your pump; that is,
the vent-valve and the air-cooler.
z
Control inputs
These are switch-type input signals which are used to control the operation of
the pumping system.
z
Status outputs
These outputs identify the status of the pump and the Controller.
z
Analogue output
The speed output provides an indication of the EXT pump speed.
Содержание EXC120
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