Despatch P1400+ Temperature Controller User Manual
Page 79
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Alarm Inhibit
Type: General Parameter
Inhibits an alarm at power-up or when the controller Setpoint is switched, until that alarm goes
inactive. The alarm operates normally from that point onwards.
Also refer to
Alarm Operation
.
Automatic Reset (Integral)
Type: Controller Tuning Parameter
Used to automatically bias the proportional output(s) to compensate for process load variations. It is
adjustable in the range 1 seconds to 99 minutes 59 seconds per repeat and OFF (value greater than
99 minutes 59 seconds - display shows
OFF
). Decreasing the time increases the Integral action.
This parameter is not available if the primary output is set to On-Off.
Display code =
ArSt
, default value = five minutes and zero seconds (
5555
.
00
00
00
00
).
Also refer to
Primary Proportional Band
,
Secondary Proportional Band
,
Rate
,
PID
, and
Tuning
.
Auto Pre-Tune
Type: Controller Tuning Parameter
Determines whether the Auto Pre-Tune feature is activated on power up (
disA
= disabled,
enAb
=
enabled). Auto Pre-Tune is useful when the process to be controlled varies significantly each time it
is run. Auto Pre-Tune ensures that tuning occurs at the start of the process. Self-Tune may also be
engaged to fine tune the controller.
Display code =
Apt
, default setting =
diSA
.
Also refer to
Pre-Tune
,
Self-Tune
and
Tuning
.
Auxiliary Input
Type: General Definition
A secondary linear input option module. It can be used as a Remote Setpoint input or for Valve
Position Indication. Signals can be mA, mV, VDC or Potentiometer.
Also refer to
Remote Setpoint
, and
Valve Position Indication
.
Band Alarm 1 Value
Type: General Parameter
This parameter is applicable only if Alarm 1 is selected to be a Band Alarm. It defines a band of
process variable values, centred on the current actual setpoint value. If the process variable value is
outside this band, the alarm will be active. This parameter may be adjusted from 1 to full span from
the setpoint.
Display code =
bAL1
, default value = 5.
Also refer to
Alarm Operation
,
Band Alarm 2 Value
and
Input Span
.
Band Alarm 2 Value
Type: General Parameter
This parameter, is similar to the Band Alarm 1 Value. It is applicable only if Alarm 2 is selected to be
a Band Alarm.
Display code =
bAL2
, default value = 5.
Also refer to
Alarm Operation
,
Band Alarm 1 Value and Input Span.