5.4
Alarm relay trip time
Display:
A
x
tt
Range:
0
to
9999
Default Value:
0
Displays and sets the alarm trip time in seconds. The trip time is common for both alarm high and
low setpoint values. The trip time provides a time delay before the alarm relay will activate when
an alarm condition is present. The alarm condition must be present continuously for the whole trip
time period before the alarm will activate. If the input moves out of alarm condition during this
period the timer will reset and the full time delay will be restored. This trip time delay is useful
for preventing an alarm trip due to short non critical deviations from setpoint. The trip time is
selectable over
0
to
9999
seconds. To set a trip time value go to the
A
x
tt
function and use the
^
or
v
push buttons to set the value required then press
F
to accept this value.
Example:
If
A1tt
is set to
5
seconds then the display must indicate an alarm value for a full 5
seconds before relay 1 will activate.
5.5
Alarm relay reset time
Display:
A
x
rt
Range:
0
to
9999
Default Value:
0
Displays and sets the alarm reset delay time in seconds. The reset time is common for both alarm
high and low setpoint values. With the alarm condition is removed the alarm relay will stay in
its alarm condition for the time selected as the reset time. If the input moves back into alarm
condition during this period the timer will reset and the full time delay will be restored. The reset
time is selectable over
0
to
9999
seconds. To set a reset time value go to the
A
x
rt
function and
use the
^
or
v
push buttons to set the value required then press
F
to accept this value.
Example:
If
A1rt
is set to
10
seconds then the resetting of alarm relay 1 will be delayed by 10
seconds.
5.6
Alarm relay normally open/closed
Display:
A
x
n.o
or
A
x
n.c
Range:
A
x
n.o
or
A
x
n.c
Default Value:
A
x
n.o
Displays and sets the setpoint alarm relay
x
action to normally open (de-energised) or normally
closed (energised), when no alarm condition is present. Since the relay will always open when power
is removed a normally closed alarm is often used to provide a power failure alarm indication. To
set the alarm relay for normally open or closed go to the
A
x
n.o
or
A
x
n.c
function and use the
^
or
v
push buttons to set the required operation then press
F
to accept this selection.
Example:
If set to
A1n.o
alarm relay 1 will be open circuit when the display is outside alarm condition and
will be closed (short circuit across terminals) when the display is in alarm condition.
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PM4COMAN-2.2-1
