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 (binary, Gray code, whole number BCD (
bcd COdE
=
0
) and weighted
digital inputs only) - note there is no relay 1 therefore relay numbering starts from 2. 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
A2tt
is set to
5
seconds then the display must indicate an alarm value for a full 5
seconds before relay 2 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 (binary, Gray code, whole number BCD
(
bcd COdE
=
0
) and weighted digital inputs only) - note there is no relay 1 therefore relay
numbering starts from 2. 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
A2rt
is set to
10
seconds then the resetting of alarm relay 2 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 (binary, Gray code, whole number BCD
(
bcd COdE
=
0
) and weighted digital inputs only) - note there is no relay 1 therefore relay
numbering starts from 2. 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
PM4BCMAN-2.0-0
23 of
Summary of Contents for PM4-BC
Page 7: ...3 5 Parallel BCD input PM4BCMAN 2 0 0 7 of 40...
Page 8: ...3 6 Strobed BCD input 8 of 40 PM4BCMAN 2 0 0...
Page 9: ...3 7 Addressed BCD input PM4BCMAN 2 0 0 9 of 40...
Page 10: ...3 8 Parallel binary input also used for Gray code 10 of 40 PM4BCMAN 2 0 0...
Page 11: ...3 9 Strobed binary input also used for Gray code PM4BCMAN 2 0 0 11 of 40...
Page 12: ...3 10 Addressed binary input also used for Gray code 12 of 40 PM4BCMAN 2 0 0...
