Yokogawa JUXTA VJA7 Manual do Utilizador descarregar pdf (Página 4)

8.3.2 Direction of Alarm Action

Select the direction of alarm-1 action and that of alarm-2 action

from among HIGH ALM (high-limit alarm) and LOW ALM (low-

limit alarm) and set each in E05: ALM1 ACTION (direction of

alarm-1 action) or E06: ALM2 ACTION (direction of alarm-2 ac-

tion).

● To activate alarm status when input signal ⱖ alarm setpoint,

select HIGH ALM.

● To activate alarm status when input signal ⱕ alarm setpoint,

select LOW ALM.

8.3.3 Hysteresis

Set alarm-1 and alarm-2 hysteresis, in E09: HYSTERESIS1 and

E10: HYSTERESIS2. Hysteresis is a value added to the alarm

setpoint in order for an alarm status to be released (to normal) after

the alarm status has been activated. The alarm status will be re-

leased in the following conditions, depending on the direction of

alarm action.

* When HIGH ALM (high-limit alarm) is set: Alarm is released

when input signal < (alarm setpoint - hysteresis).

* When LOW ALM (low-limit alarm) is set: Alarm is released

when input signal > (alarm setpoint + hysteresis).

● Setting range: A range of 0 to 100% of input range

● Setting resolution: 0.1%

8.3.4 Alarm ON Delay and Alarm OFF Delay

Set alarm-1 and alarm-2 ON delays in E11: ON DELAY1 and

E12: ON DELAY2 and then alarm-1 and alarm-2 OFF delays in

E13: OFF DELAY1 and E14: OFF DELAY2.

An alarm ON delay is a delay time from the establishment of

alarm condition to alarm output; an alarm OFF delay is a delay

time from the establishment of return-to-normal condition to out-

put.

● Setting range: 0 to 999 seconds

● Setting resolution: 1 second (Note that about 0.2 second will

be added to set time to prevent erroneous operation.)

For example, when an alarm ON delay is set to 1 second, alarm

output is generated if alarm status continues for more than 1 sec-

ond after the input value exceeds the alarm setpoint. Further, when

an alarm OFF delay is set to 2 seconds, alarm output is released if

normal condition continues for more than 2 seconds after the input

value has returned to normal from the alarm status.

8.3.5 Direction of Relay Action

Set the direction of relay energizing in alarm-1 normal condition

and alarm-2 normal condition by selecting from among NRM DE-

ENERGIZED (de-energized under normal condition) and NRM

ENERGIZED (energized under normal condition) in E15: RL1

ACTION and E16: RL2 ACTION and set them.

9. DESCRIPTION OF ALARM ACTIONS

This chapter describes examples of alarm actions under the following conditions.

metI

1-mralA2-mralA

retemaraPtniopteSretemaraPtniopteS

noitcamralafonoitceriDNOITCA1MLA:50Emralatimil-hgiHNOITCA2MLA:60Emralatimil-woL

gnittesmralA1TNIOPTES:10E%082TNIOPTES:20E%51

siseretsyH1SISERETSYH:70E%012SISERETSYH:80E%5

yaledNOmralA1YALEDNO:11E.ces12YALEDFFO:21E.ces3

yaledFFOmralA1YALEDFFO:31E.ces22YALEDFFO:41E.ces4

mralafonoitpircseD

snoitca

tupniehterehwnoitidnocehtfisdnuosmralaehT

seunitnocmralatimil-hgihfoeromro%08sieulav

,sdnuosmralaehtretfA.dnoces1nahteromrof

nahtsselsieulavtupnierehwnoitidnocehtnehw

nahteromrofseunitnocmralatimil-hgihehtfo%07

.lamronotsnrutersutatseht,sdnoces2

tupniehterehwnoitidnocehtfisdnuosmralaehT

seunitnocmralatimil-wolfosselro%51sieulav

,sdnuosmralaehtretfA.sdnoces3nahteromrof

nahteromsieulavtupnierehwnoitidnocehtnehw

nahteromrofseunitnocmralatimil-wolehtfo%02

.lamronotsnrutersutatseht,sdnoces4

[%]

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 conditions established

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

Alarm conditions established

High-limit alarm ON

High-limit alarm OFF

Normal conditions established

[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-1 action

Alarm-2 action

Alarm

Normal

Normal Alarm Normal

1 2 3 4 5

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