Dynisco UPR900 Manuale di applicazione e configurazione - Pagina 9

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Alarms
&
Latching
Outputs
UPR900

Alarms



In
Alarm
Configuration,
there
are
up
to
3
alarms
selectable
as
Process
High,
Process
Low,
Rate
of
Signal
Change

(per
minute),
Sensor/input
Break,


The
alarm
source
can
be
input
1
or
2



Enter
the
value
(threshold)
at
which
the
alarm
should
occur,
an
adjustable
hysteresis
value
and
an
alarm
filter
time

(this
is
the
minimum
duration
for
on
to
happen,
but
if
set
to
OFF
activation
is
immediate).
There
is
also
an
option
to

inhibit
(mask)
an
alarm
at
power‐up.



Colour
change
on
alarm
is
optional
(set
in
Display
Configuration)



Outputs



Only
relays
can
be
used
as
alarm
outputs.
In
Output
Configuration,
select
a
relay
output
to
use,
then
select
Alarm

1,
2
or
3
(direct
or
reverse
acting).
Alternatively,
select
Boolean
logical
output
of
alarms
1
OR
2,
or
alarms
1,
2
OR
3

(these
also
can
be
direct
or
reverse
acting).
Reverse
action
with
OR
would
equate
to
Boolean
NOR.

Each
output
can
be
selected
to
latch
or
not
independently.



Usage



If
the
alarm
threshold
is
exceeded
for
longer
than
the
filer
time
(assuming
no
power‐up
inhibit),
the
alarm

activates,
and
relay
changes
state.



NOTE:
from
normal
main
operator
screen,
pressing
the
BACK
key
shows
the
Alarm
Status
Screen,
and
another

press
will
show
the
Clear
Latched
Outputs
screen
(if
any
are
latched).



When
alarm
threshold
is
no‐longer
exceeded,
the
alarm
turns
off
and
a
non‐latching
relay
output
would
also

change
back.
However,
if
the
relay
output
was
set
for
latching
it
would
not
change
back.

At
the
Clear
Latched
Outputs
screen,
use
FORWARD
or
BACK
keys
to
select
the
latched
outputs,
then
press
the
UP

or
DOWN
key
to
unlatch
it.
NOTE:
The
output
can
only
be
unlatched
if
the
associated
alarm
is
no‐longer
active.



ATC990



As
UPR900
except
additional
alarm
types
are
possible:

PV‐SP
Deviation,
Band,
Control
Loop,
Percentage
memory
used,
High
and
Low
power.