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Page 9
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Introduction
D396-14-880 Issue J
SYS Interlock (SYSI)
Note:
The EXC120E Controller does not have a backing pump relay.
Use the SYS Interlock to interlock the Controller to a system fail or control signal, for example, a position switch on
a door of the vacuum chamber or a start contactor for a backing pump.
When the SYS Interlock opens:
z
the backing pump relay opens (see
z
the electrical supply to the vent-valve is switched off (see
).
Note that:
z
If the SYS Interlock is open when Start is selected, the Start LED on the Start/Stop button will flash.
z
If the SYS Interlock is opened after Start has been selected, but with the TMP Interlock open, the Start LED
will continue to flash.
z
If the SYS Interlock is opened after the EXT pump has started, the Controller will trip into Fail condition. If
the SYS Interlock then closes again, the vent option you have selected (refer to Sections
) will
determine the operation of the backing pump relay and the electrical supply to the vent-valve.
1.7.4
Status outputs
The Controller provides Normal and Fail status output signals (TMP Normal and TMP Fail) through volt-free contacts
on the logic interface connector. The EXC300M Controller also provides an Axial Emergency condition signal (also on
a volt-free contact). These signals can be used to control devices in the pumping system or provide remote status
output signals.
The signals operate as described below.
1.7.5
Analogue outputs
The Pump Speed analogue output signal is proportional to EXT pump speed. Connect the output to a suitable meter
or indicator to display the pump speed or connect the output to your control equipment (for example, to operate
other components in the pumping system at preset EXT pump speeds).
z
TMP Normal
TMP Normal is normally open and closes when the EXT pump speed reaches the
Normal speed setpoint. The Normal speed setpoint is determined by a
potentiometer on the top of the Controller. The Controller is supplied with the
potentiometer adjusted so that the Normal speed setpoint is 80% of full rotational
speed. You can adjust the Normal speed setpoint as described in
.
z
TMP Fail
TMP Fail is normally closed and opens when the Controller trips into Fail condition
(see
).
z
Axial Emergency
(EXC300M only)
Axial Emergency is normally closed and opens when an Axial Emergency is detected
(see
).
Содержание EXC120
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