FEC920: USER GUIDE
Page 101
September 18
Standby action
For Type = Valve Raise only, this specifies the valve action when the instrument is in
standby mode.
Continue: Output continues at the demanded level.
Freeze: The valve stops being driven.
Output
Off = relay contacts open; On = relay contacts closed.
6.9.3 Digital inputs
This applies to terminals pairs LALC, LBLC (Figure 4). Highlight the relevant terminal pair, then operate the
scroll key to reveal the configuration menu.
Module Ident
Dig.In
Type
Contact I/P
PV
0 = contact is open; 1 = contact is closed.
Invert
Inverts the sense of the input.
6.9.4 Digital outputs
This applies to terminal pair 2A2B (Figure 4). Highlight 2A2B, then operate the scroll key to reveal the
configuration menu.
Module Ident
Dig.Out
Type
On Off O/P, Time Prop O/P or Valve Raise
PV
For On Off O/P, a value
0.5 drives the output high, otherwise, the output is driven low.
For Time Prop O/P, the value is the demanded output percentage.
Min On Time
For Type = Time Prop O/P only, this allows a minimum on time to be specified.
Configurable range = 0.1 to 150 seconds
Invert
Inverts the output sense for digital outputs; or the input signal for digital inputs.
Inertia
For Type = Valve Raise only, this allows a value to be entered (in seconds) to take into
account valve run-on.
Backlash
For Type = Valve Raise only, this allows a value to be entered (in seconds) in order to
compensate for backlash in the valve linkage.
Standby action
For Type = Valve Raise only, this specifies the valve action when the instrument is in
standby mode.
Continue: Output continues at the demanded level.
Freeze: The valve stops being driven.
Output
Off = output being driven low; On = output being driven high.
6.10 DC OUTPUT
This option provides a voltage (terminals 3A3B only) or mA output. Terminal location is shown in Figure 4.
Caution:
There are no mechanical interlocks to prevent a chassis with the dc output option
being fitted into a ‘sleeve’ or ‘case’ which has previously been wired for the
standard relay output. Before fitting the chassis into the case, it should be ensured
that the terminal wiring is not attached to live voltage supplies, as such voltages
may cause permanent damage to the instrument.
A5E45696052A Rev-AA
