Instruction manual

3 9 Process Alarms3 9 Process Alarms
There are at most two independent alarms available by adjusting OUT2. If
AL2 is selected for OUT2, then OUT2 will perform alarm 2 function. Now
A2FN can't be selected with NONE, otherwise will be displayed.
A process alarm sets an absolute trigger level (or temperature). When the
process (could be PV1, PV 2 or PV1-PV2) exceeds that absolute trigger level
an alarm occurs. A process alarm is independent from set point.
Adjust A1FN (Alarm 1 function) in setup menu. One of 8 functions can be
selected for process alarm. These are: PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L, D1.2.H, D1.2.L. When the PV1.H or PV1.L is selected the alarm
examines the PV1 value. When the PV2.H or PV2.L is selected the alarm
examines the PV2 value. When the P1.2.H or P1.2.L is selected the alarm
occurs if the PV1 or PV2 value exceed the trigger level. When the D1.2.H or
D1.2.L is selected the alarm occurs if the PV1-PV2 (difference) value exceeds
the trigger level. The trigger level is determined by A1SP (Alarm 1 set point)
and A1HY ( Alarm 1 hysteresis value ) in User Menu for alarm 1. The hysteresis
value is introduced to avoid interference action of alarm in a noisy environment.
Normally A1HY can be set with a minimum (0.1) value.
A1DV and/or A2DV are hidden if alarm 1 and/or alarm 2 are set with process
alarm.
When a normal alarm is selected, the alarm output is de-energized in the
non-alarm condition and energized in an alarm condition.
If a latching alarm is selected, once the alarm output is energized, it will
remain unchanged even if the alarm condition is cleared. The latching alarms
are disabled when the power is shut off or if event input is applied with proper
selection of EIFN.
A holding alarm prevents an alarm from power up. The alarm is enabled
only when the process reaches the set point value (may be SP1or SP2,
See event input). Afterwards, the alarm performs same
function as normal alarm.
Er06
Normal Alarm : A1MD = NORM
Latching Alarm: A1MD = LTCH
Holding Alarm: A1MD = HOLD
section 4-1
There are at most two independent alarms available by adjusting OUT2. If
AL2
is selected for OUT2, then OUT2 will perform alarm 2 function. Now
A2FN
can't be selected with NONE, otherwise will be displayed.
A
process alarm sets an absolute trigger level (or temperature). When the
process
(could be PV1, PV 2 or PV1-PV2) exceeds that absolute trigger level
an
alarm occurs. A process alarm is independent from set point.
Adjust
A1FN
(Alarm
1 function) in setup menu. One of 8 functions can be
selected
for process alarm. These are: PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L,
D1.2.H,
D1.2.L.
When
the PV1.H or PV1.L is selected the alarm
examines
the
PV1
value.
When the PV2.H or PV2.L is selected the alarm
examines
the PV2 value. When the P1.2.H or P1.2.L is selected the alarm
occurs
if the
PV1
or PV2
value
exceed
the
trigger
level.
When the
D1.2.H
or
D1.2.L
is selected
the
alarm
occurs
if the
PV1-PV2
(difference)
value
exceeds
the
trigger
level.
The trigger
level
is
determined
by
A1SP (Alarm
1 set
point)
and
A1HY ( Alarm 1 hysteresis value ) in User Menu for alarm 1. The hysteresis
value
is introduced to avoid interference action of alarm in a noisy environment.
Normally
A1HY can be set with a minimum (0.1) value.
A1DV
and/or
A2DV
are
hidden
if alarm 1 and/or alarm 2 are set with process
alarm.
When
a normal alarm is selected, the alarm output is de-energized in the
non-alarm
condition and energized in an alarm condition.
If
a latching alarm is selected, once the alarm output is energized, it will
remain
unchanged even if the alarm condition is cleared. The latching alarms
are
disabled when the power is shut off or if event input is applied with proper
selection
of EIFN.
A
holding alarm prevents an alarm from power up. The alarm is enabled
only
when the process reaches the set point value (may be SP1or SP2,
See event
input). Afterwards, the alarm performs same
function
as normal alarm.
Er06
Normal
Alarm
:
A1MD =
NORM
Latching
Alarm: A1MD = LTCH
Holding
Alarm: A1MD = HOLD
section 4-1
Process Alarm 1Process Alarm 1
Setup : A1FN, A1MDSetup : A1FN, A1MD
Adjust : A1SP, A1HYAdjust : A1SP, A1HY
Process Alarm 2Process Alarm 2
Setup : OUT2, A2FN, A2MDSetup : OUT2, A2FN, A2MD
Adjust : A2SP, A2HYAdjust : A2SP, A2HY
Trigger level = A1SP 1/2 A1HYATrigger level = A1SP 1/2 A1HYA
Trigger level = A2SP 1/2 A2HYATrigger level = A2SP 1/2 A2HYA
Reset Latching alarmReset Latching alarm
1. Power off1. Power off
2. Apply Event input in accordance2. Apply Event input in accordance
with proper selection of EIFNwith proper selection of EIFN
205
195
205
195
205 205 205
195 195 195
ON
OFF
Figure 3.5
Normal Process Alarm
Figure 3.5
Normal
Process Alarm
A1SP = 200 A1HY = 10.0
A1MD = NORM A1FN = PV1.H
A1SP = 200 A1HY = 10.0
A1MD
= NORM A1FN = PV1.H
Process proceedsProcess proceeds
Examples:
Latching / Holding Alarm : A1MD = LT.HO
A latching / holding alarm performs both holding and latching function.
Latching / Holding Alarm : A1MD = LT.HO
A latching / holding alarm performs both holding and latching function.
8 Types of Process Alarms :
PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L, D1.2.H, D1.2.L
8 Types of Process Alarms :
PV1.H,
PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L,
D1.2.H, D1.2.L
48
Error CodeError Code