an independent setpoint value or may be linked to operate at a fixed difference to another relay
setpoint, known as trailing operation. The operation is as follows:
Alarm 1 (
AI
) is always independent. Alarm 2 (
A2
) may be independent or may be linked to
Alarm 1. Alarm 3 (
A3
) may be independent or may be linked to Alarm 1 or Alarm 2. Alarm 4
(
A4
) may be independent or may be linked to Alarm 1, Alarm 2 or Alarm 3. The operation of
each alarm is selectable by selecting, for example, (Alarm 4)
A4.SP
= Alarm 4 normal setpoint
or
A4.t1
= Alarm 4 trailing Alarm 1 or
A4.t2
= Alarm 4 trailing Alarm 2 or
A4.t3
= Alarm
4 trailing Alarm 3. For trailing set points the setpoint value is entered as the difference from the
setpoint being trailed. If the trailing setpoint is to operate ahead of the prime setpoint then the
value is entered as a positive number and if operating behind the prime setpoint then the value is
entered as a negative number.
Example:
With Alarm 2 set to trail alarm 1, if
A1Hi
is set to
1000
and
A2Hi
is set to
50
then Alarm 1 will activate at
1000
and alarm 2 will activate at
1050
(i.e. 1000 + 50). If Alarm
2 had been set at
-50
then alarm 2 would activate at
950
(i.e. 1000 – 50).
5.8
Preset value
Display:
P.SEt
Range:
Any display value
Default Value:
0
Displays and sets the preset value, this function will not be seen unless either the
R.INP
or
P.SEt
function is set to
P.SEt
. The preset value can be used via the remote input or the front panel
P
button to force the display to go to the preset value. A change in the input value will then cause
the display to rise or fall from the preset value. To use the remote input to operate the preset
functions set the
R.INP
value to
P.SEt
. To use the
P
button to operate the preset function set
the
P.but
function to
P.SEt
.
5.9
Display brightness
Display:
brGt
Range:
1
to
15
Default Value:
15
Displays and sets the digital display brightness. The display brightness is selectable from
1
to
15
,
where
1
= lowest intensity and
15
= highest intensity. This function is useful for improving the
display readability in dark areas or to reduce the power consumption of the instrument. See also
the
duLL
function. To set brightness level go to the
brGt
function and use the
^
or
v
push
buttons to set the value required then press
F
to accept this value.
5.10
Display remote brightness switching
Display:
duLL
Range:
0
to
15
Default Value:
1
Displays and sets the level for remote input brightness switching, see
R.INP
function. When a
remote input is set to
duLL
the remote input can be used to switch between the display brightness
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