Edwards EXC 100E, Instruction Manual

Page: 10 / 42

D396-20-880 Issue H
Page 4 © Edwards Limited 2015. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.4.4 Status outputs
The Controller provides Normal, Fail and Pump On status output signals (TMP Normal, TMP Fail and TMP On) through
open collector transistor outputs on the logic interface connector. These signals can be used to control devices in
the pumping system or to provide remote status output signals. The signals operate as described below.
1.4.5 Analogue output
The Controller has a single analogue output signal, which can be configured to indicate either Pump Speed or Pump
Power consumption.
The Controller is supplied configured so that the 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 a preset EXT pump speed).
If required, you can configure the Controller so that the analogue output signal is proportional to the electrical power
drawn by the EXT pump (see Sections
2.5 and 3.2.2 ). Connect the output to a suitable meter or indicator to display
the pump power or connect the output to your control equipment.
1.5 Vent-valve control
1.5.1 Introduction
Note: The factory settings for vent options are shown in Table 9 .
If the Controller electrical supply fails, the Controller maintains the electrical supply to the vent-valve until the pump
speed falls to below 50% of full rotational speed, then the Controller switches off the vent-valve electrical supply.
This feature of the Controller cannot be reconfigured.
However, you can use the configuration links in the Controller (refer to Section 3.2.4 ) to select a combination of vent
options in response to the Stop input signal and the TMP Fail output signal.
When a selected vent option condition is detected, the Controller:

waits approximately two seconds, to allow a vacuum system isolation-valve (if fitted) to close,

then switches off the electrical supply to the vent-valve.
TMP Normal TMP Normal is normally high and goes low when the EXT pump reaches its ‘Normal’ speed.
The Normal speed is determined by a potentiometer on the side of the Controller. The
Controller is supplied with the potentiometer adjusted so that Normal speed is 80% of full
rotational speed. You can adjust the Normal speed as described in
Section 3.10 . The Normal
LED on the rear panel of the Controller ( Figure 1 , item 6) is on when the TMP Normal signal
is low.
TMP Fail TMP Fail is normally low and goes high when the Controller trips into a Fail condition (see
Section 1.6 ).
TMP On The TMP On signal mimics the operation of the vent-valve. If you select Vent On Stop (see
Section 1.5.2 ), TMP On is normally high and goes low when the electrical supply to the EXT
pump is switched on by the Controller.