Yokogawa JUXTA VJU7 - Manual (Page 6)

6
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01U07-01E 4th Edition Feb. 09, 2007-00
10. DESCRIPTION OF ALARM ACTIONS
This chapter describes examples of alarm actions under the following conditions.
Item
Alarm 1 Alarm 2
Parameter Setpoint Parameter Setpoint
Direction of alarm action E05 : ALM1 ACTION High-limit alarm E06 : ALM2 ACTION Low-limit alarm
Alarm setting E03 : SET POINT1 80% E04 : SET POINT2 15%
Hysteresis E09 : HYSTERESIS1 10% E10 : HYSTERESIS2 5%
Alarm ON delay E11 : ON DELAY1 1 sec E12 : ON DELAY2 3 sec
Alarm OFF delay E13 : OFF DELAY1 2 sec E14 : OFF DELAY2 4 sec
Description of
alarm actions
The alarm is output if the condition where
the input value is 80% or more of high-
limit alarm continues for 1 second or
more.
After the alarm is output, when the
condition where the input value is less
than 70% of high-limit alarm continues for
2 seconds or more, the status returns to
normal. The alarm is output if the condition where
the input value is 15% or less of low-limit
alarm continues for 3 seconds or more.
After the alarm is output, when the
condition where the input value is more
than 20% of low-limit alarm continues for
4 seconds or more, the status returns to
normal.
[%]
0
20
15
40
60
80
100
[1] [2]
[3] [4]
1 sec 2 sec
3 sec 4 sec
Alarm-2 hysteresis (5%)
Alarm-1 hysteresis (10%)
Alarm-1 setpoint (80%)
Alarm-2 setpoint (15%)
Elapsed time 1 sec
Alarm-1 ON delay Alarm-1 OFF delay
Alarm conditions established Alarm conditions established Normal conditions established Normal conditions established
Low-limit alarm ON Low-limit alarm OFF Alarm-2 ON delay Alarm-2 OFF delay
[1]: Alarm status does not continue for more than 1 second after the
alarm conditions are established at alarm 1.
[2]: Normal status does not continue for more than 2 seconds after the
normal conditions are established at alarm 1.
[3]: Alarm status does not continue for more than 3 seconds after the
alarm conditions are established at alarm 2.
[4]: Normal status does not continue for more than 4 seconds after the
normal conditions are established at alarm 2.
Alarm conditions established Alarm conditions established
High-limit alarm ON High-limit alarm OFF
Normal conditions established Normal conditions established
Alarm-1 action
Alarm-2 action
Alarm Normal Normal
Normal Alarm Normal