30
[Description]
• Alarm action can be selected from
16 types. Of these types, deviation
alarm, absolute value alarm, range
alarm and hold (lower limit) are ex-
plained in the following. Alarm is
specified by either one of deviation
and absolute value.
Deviation alarm
When alarm is outputted at tempera-
ture of more than 100
°
C above 100
°
C
of set value (SV) and more than 50
°
C
below the set value, the setting of up-
per limit alarm (AH) is 100
°
C and that
of lower limit alarm (AL) is 50
°
C.
When the set value (SV) changes, the
alarm action point is also changed.
Setting of lower limit alarm (ALM2) action type (option)
Setting of upper limit alarm (ALM1) action type (option)
Absolute value alarm
When alarm is outputted at tempera-
ture of more than 200
°
C and less than
50
°
C, the setting of upper limit alarm
(AH) is 200
°
C and that of lower limit
alarm (AL) is 50
°
C. Unlike the de-
viation alarm, the alarm action point
remains unchanged at change of the
set value.
Range alarm
In the case of range alarm, either one
of absolute value and deviation can be
selected. Alarm is outputted between
AL and AH.
Lower limit hold
At the start of operation, the furnace
temperature is normally below 100
°
C.
In this case, lower limit alarm is not
outputted. When temperature rises
above the set value of AL and then low-
ers, lower limit alarm turns ON. This
function is called the alarm action
“Hold”.
Related parameter: AL (Page 9)
AH (Page 10)
P-An (Page 28)
ON
OFF
AL
100
°
C
SV
100
°
C
AL
50
°
C
AH
200
°
C
SV
100
°
C
AL
50
°
C
SV
100
°
C
AH
200
°
C
AL
50
°
C
50
°
C
100
°
C
SV
100
°
C
AH
200
°
C
Alarm action type code table
PV
SV
AH
AL
PV
SV
AH
AL
ALM1
(P-AH)
Absolute
value alarm
Deviation
alarm
Upper limit absolute
(with hold)
Lower limit absolute
(with hold)
Upper limit deviation
(with hold)
Upper/lower limit
deviation
Lower limit deviation
(with hold)
Upper/lower limit
deviation (with hold)
ALM2
(P-AL)
Alarm type
Without alarm
Upper limit absolute
Lower limit absolute
Upper limit deviation
Lower limit deviation
0
0
1
1
2
2
3
3
4
4
Range
alarm
Range upper limit
absolute and lower
limit deviation
Range upper limit
deviation and lower
limit absolute
Range upper/lower limit
deviation (ALM1/2
independent action)
Range upper/lower
limit absolute
Range upper/lower
limit deviation
11
11
—
12
—
13
—
14
—
15
5
5
6
6
7
7
8
8
9
9
10
10
Action diagram
ALM1
(P-AH)
ALM2
(P-AL)
Alarm type
Action diagram
PV
PV
AH
AL
PV
AH
AL
PV
AH
AL
PV
AH
AL
PV
SV
AH
AL
PV
SV
AH
AL
PV
SV
AH
AL
AH
AL
PV
SV
AH
AL
AH
AL
PV
SV
AH
AL
AH
AL
PV
AL
AH
PV
SV
AL
AH
PV
SV
AH
AL
PV
SV
AL
AH
Note)
Alarm set value may change with change in alarm
action type.
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