18
7.4
Set Up Alarms Page
– press to advance to next parameter
or
– press to advance to next page.
These two keys are used to advance to all subsequent parameters and pages. If a
parameter is changed it is automatically stored on operation of either key.
Alarm 1 Type
Select the type of alarm required. For
Fail
,
Temp
and
Cond
alarm types, the alarm
l.e.d. is off and the relay energized during normal conditions. In a fail condition, the l.e.d.
is on and the relay de-energized.
Fail
– The instrument alerts the operator to either a power failure or a condition that
causes any of the error messages listed in Table 9.1 to be displayed.
Temp
– The instrument alerts the operator if the temperature of the process fluid
exceeds or drops below the value set in the
Alarm 1 Set Point
parameter,
depending on the type of
Alarm 1 Action
selected below.
Cond
– The instrument alerts the operator if the conductivity of the process fluid
exceeds or drops below the value set in the
Alarm 1 Set Point
parameter,
depending on the type of
Alarm 1 Action
selected below.
Off
– If selected, no alarms are set and the alarm l.e.d. is off and the relay de-
energized at all times.
Alarm 1 Action
For
'Fail-safe'
alarm operation the relay's alarm state must be the same as the power-
down state, i.e. the relay is de-energized.
For
High
alarm operation the relay must be energized below the alarm set point.
For
low
alarm operation the relay must be energized above the alarm set point.
The alarm l.e.d.s are illuminated in the alarm condition.
Select the required alarm 1 action from the following table:
The set point band is defined as the actual value of the set point plus or minus the
hysteresis value. The hysteresis value is
±
1% of the set point value displayed in the Set
Up Parameters Page – see page17. Alarm action occurs if the input value is above or
below the set point band. If the input moves within the set point band the last alarm action
is maintained.
Alarm 1 Set Point
The alarm 1 set point can be set to any value within the input range being displayed. The
set point value is subject to hysteresis as detailed above.
Set the alarm set point to the required value.
continued on next page.
m
r
a
l
A
n
o
i
t
c
A
n
o
i
t
i
d
n
o
C
D
E
L
t
u
p
n
I
r
o
f
t
n
i
o
P
t
e
S
e
v
o
b
A
n
o
i
t
i
d
n
o
C
D
E
L
t
u
p
n
I
r
o
f
t
n
i
o
P
t
e
S
w
o
l
e
B
n
o
i
t
i
d
n
o
C
y
a
l
e
R
t
u
p
n
I
r
o
f
t
n
i
o
P
t
e
S
e
v
o
b
A
n
o
i
t
i
d
n
o
C
y
a
l
e
R
t
u
p
n
I
r
o
f
t
n
i
o
P
t
e
S
w
o
l
e
B
h
g
i
H
N
O
F
F
O
d
e
z
i
g
r
e
n
e
-
e
D
d
e
z
i
g
r
e
n
E
w
o
L
F
F
O
N
O
d
e
z
i
g
r
e
n
E
d
e
z
i
g
r
e
n
e
-
e
D
…7
PROGRAMMING
A1 Setpoint
SET UP ALARMS
– – – – –
A1 Action High
– – – – –
Low
A1 Type Fail
– – – – –
Temp
Cond
Off
Fail or
Off
4 . 0 0
Summary of Contents for 4623
Page 30: ...28 NOTES ...