Yokogawa JUXTA M Series Digital Limit Alarms MVHK User Manual

Page 4

IM 77J04H31-01E 3rd Edition : 2006.08.31-00

8. SETTING ALARM-RELATED PARAMETERS

8.1

Setting Ranges and Factory-Set Values of Alarm-Related Parameters

Alarm Action Type Code

Low-limit
alarm
setpoint

Power ON

Time

Normal

Regarded

as normal

Abnormal

(Alarm ON)

If an alarm type code with
stand-by action is set, alarm
action is turned off during the
start-up control.
This function is useful at power
ON or when changing the alarm
type.

Stand-by Action

Parameter Name

Setting Range

Factory-Set

Value

Parameter

Symbol

Alarm-1 action
(AL1)

-1999 to 9999
(Within the range of set input scaling values)
*The setting range depends on the setting of the
decimal point position (SDP).

Setting range: 0 to 999 sec.
Setting resolution: 1 sec.

See the Alarm Action Type Codes table.

Alarm-2 action
(AL2)

Alarm-3 action
(AL3)

1.0

Alarm-4 action
(AL4)

Alarm-1 hysteresis
(HY1)

0 to 9999

The value resulting from adding a hysteresis
value to an alarm setpoint should be within the
range of set input scaling values.

* The setting range depends on the setting of the

decimal point position (SDP).

-1999 to 9999

Within the range of set input scaling values

* The setting range depends on the setting of the

decimal point position (SDP).

1.0

Alarm-2 hysteresis
(HY2)

1.0

Alarm-3 hysteresis
(HY3)

1.0

Alarm-4 hysteresis
(HY4)

Alarm ON delay
(OND)

Alarm OFF delay
(OFD)

0.0

Setpoint
(SP)

Parameter Name

Setting Range

Factory-Set

Value

Parameter

Symbol

20.0

2 points of alarms: 80.0
4 points of alarms: 30.0

2 points of alarms: 1
4 points of alarms: 2

70.0

80.0

Setup Parameter Screen 1

Operation Parameter Screen

Deviation

low-limit

alarm

Deviation

high-limit

alarm

Deviation

high and
low-limit

alarm

Deviation

within high

and low-limit

alarm

PV high-limit

alarm

PV low-limit

alarm

De-
energized
under
Normal
Condition

(Parameters A1 to A4 are not displayed.)

Without Stand-by

Action

With Stand-by

Action

De-
energized
under
Normal
Condition

Energized
under
Normal
Condition

Hysteresis

Alarm

Alarm setpoint

Normal

Hysteresis

Normal

Alarm setpoint

Alarm

Hysteresis

Alarm

Setpoint

Deviation setpoint

Normal

Hysteresis

Normal

Setpoint

Deviation setpoint

Setpoint

Deviation setpoint

Setpoint

Deviation setpoint

Alarm

Normal

Alarm

Normal

Alarm Type

No alarm

Alarm Action

Alarm-1 setpoint
(A1)

Alarm-2 setpoint
(A2)

Alarm-3 setpoint
(A3)

Alarm-4 setpoint
(A4)

8.2

Setting Alarm Output-Related Parameters

This section describes an example of setting the alarm-1 action (AL1) to “12” (PV low-limit
alarm, with stand-by action), alarm-1 setpoint (A1) to “0,” alarm-1 hysteresis (HY1) to “5,”
alarm ON delay (OND) to “5” and alarm OFF delay (OFD) to “5” with the input scaling
values (SL, SH) set to “-50 to 150.” (Parameters relating to alarm 2 to alarm 4 can be set
in the same way as the procedure below.)
The alarm setpoints, setpoint (set when setting a deviation alarm) and hysteresis are
based on the set input scaling values.
For example, if the input scaling values are “-50 to 150,” to set the low-limit alarm value to
25% of the measured input range, set the low-limit alarm value to “0.”

Press or

to display "12."

When the SET/ENT key is pressed for more than 3 sec.
with the Operation Parameter Screen displayed, the Setup
Parameter Screen 1 appears with parameter "AL1"
displayed.

When the power is turned on, the PV screen of the
Operation Parameter Screen appears.

Press the UP or DOWN key to display "5" on the DATA
display.

Press the SET/ENT key to accept alarm-1 hysteresis "5."

Press the SET/ENT key to display parameter "OND."

Press for more

than 3 sec.

Press .

This completes the process for
setting the alarm-1 hysteresis.

This completes the process for
setting the alarm-1 action.

This completes the process for
setting the alarm-1 setpoint.

The decimal point blinks during
data change.

Press the UP or DOWN key to display "5" (sec.) on the
DATA display.

Press the SET/ENT key to accept alarm ON delay "5"
(sec).

Press the SET/ENT key again to display parameter
"OFD."

The decimal point blinks during
data change.

Press the UP or DOWN key to display "5" (sec.) on the
DATA display.

Press the SET/ENT key to accept alarm OFF delay "5"
(sec).

Press the SET/ENT key for more than 3 sec.
This causes the Operation Parameter Screen to appear.

This completes the process for
setting the alarm OFF delay.

The decimal point blinks during
data change.

Press the UP or DOWN key to display "12" on the DATA
display.

Press the SET/ENT key to accept alarm-1 action "12."

Then to set the alarm setpoint, press the SET/ENT key for
more than 3 sec. to display the Operation Parameter
Screen. (To set the hysteresis parameter and successive
settings, press the SET/ENT key to display the next
parameter.)

Setup Parameter Screen 1

Operation Parameter Screen

Press the SET/ENT key to display parameter "A1."

Press the UP or DOWN key to display a low-limit alarm
value "0" (value corresponding to 25% of the scaling
value) that is set to the DATA display.

Press the SET/ENT key to accept low-limit alarm "0."

Operation Parameter Screen

To the Operation Parameter Screen

Power ON

Step 3

Setting the alarm action

Setting the alarm setpoint

Setting the hysteresis

Setting the alarm ON delay

Setting the alarm OFF delay

Press this key for
more than 3 sec.

Press to display "A1."

Press or

to display "0."

Press .

Press to display

"OND."

Press .

Press or

to display "5."

Press or

to display "5."

Press .

Press or

to display "5."

Press .

Press for more

than 3 sec.

This completes the process for
setting the alarm ON delay.

9. INPUT ADJUSTMENTS

9.1

Setting Ranges and Factory-Set Values of Adjustment-Related Parameters

Setup Parameter Screen 2

OFF (0) or ON (1)
(This parameter is used (set to ON) to reset adjusted
values.)

(SH - SL) - 10%

BL < BH

(SH - SL) + 10%

(SH - SL) - 10%

AL < AH

(SH - SL) + 10%

(SH - SL) - 10%

BL < BH

(SH - SL) + 10%

(SH - SL) - 10%

AL < AH

(SH - SL) + 10%

Parameter Name

Setting Range

Factory-Set

Value

Parameter

Symbol

OFF

Input adjustment reset
(RST)

Input adjustment point
LOW (BL)

Input adjustment
LOW (AL)

Input adjustment point
HIGH (BH)

Input adjustment
HIGH (AH)

9.2

Instrument for Adjustments

• DC voltage/current standard (Yokogawa’s 7651 or equivalent): 1