Edwards EXC120, Инструкция по эксплуатации

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D396-14-880 Issue J
Page 28 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
3.7 Connect the backing pump (EXC120/300/300M only)
Note: To control a backing pump with the EXC120E, use the 24 V d.c. vent-valve electrical supply on the logic
interface to operate the pump through a suitable relay or contactor. This configuration will provide
identical control logic to that for the backing pump relay on the other Controllers.
The single-pole backing pump relay in the Controller provides a switching signal to control the backing pump
electrical supply; it does not provide a backing pump electrical supply. You can use the backing pump relay to control
the backing pump in one of two ways:
z
Directly, as shown in Figure 10 .
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Through a contactor, as shown in Figure 11 .
Use a suitably rated three-core cable to connect the backing pump to the Controller. If you use an external contactor,
ensure that the contactor is suitably rated for use in this way.
1. Connect the wires of your backing pump cable to the appropriate pins of the backing pump relay electrical
connector (supplied). The pins of the connector are used as follows:
2. Connect the other end of your cable to the backing pump and/or the electrical supply, as appropriate.
3.8 Connect the bakeout band (EXC120/300/300M only)
If you have fitted a bakeout band to the EXT pump, insert a suitably rated fuse into the bakeout band fuse holder,
then fit the connector on the bakeout band cable to the heater connector on the rear of the Controller (see Figures
3 and 5 ).
3.9 Connect an Active gauge
Use an Edwards Active gauge cable (available as an accessory: see Section 7.3.5 ) to connect an Edwards Active gauge
to the Controller through the active gauge connector on the rear of the Controller (see Figures 3 to 5 ).
If you want to use the set-point facility on an Active Pirani Gauge or Active Thermocouple Gauge to operate the TMP
Interlock, you must remove the link fitted to the TMP Interlock control input on the logic interface; that is:
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On EXC120 and EXC120E Controllers, remove the link between pins 12 and 13.
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On EXC300 and EXC300M Controllers, remove the link between pins 13 and 14.
If you want to use the Controller TMP Normal relay to enable an Active Inverted Magnetron Gauge, you must connect
the TMP Normal relay isolated common line to the electrical supply 0 V line; that is:
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On EXC120 and EXC120E Controllers, link pins 4 and 7.
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On EXC300 and EXC300M Controllers, link pins 4 and 8.
WARNING
Fit an earth (ground) wire to the backing pump relay electrical connector. If you do not, the case
of the Controller may become live if there is a wiring fault.
Pin Use
1 Live in
2 Switched live out
3 Earth (ground)