Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 155)

12-3

IM 01E30D01-01EN

<12. OUTLINE>

Totalizer Display Function (*2):

Theowrateiscountedonecountatatimeaccord-

ing to the setting of totalization pulse weights. For

forward

andreverseowmeasurementfunctions,

thetotalizedvaluesoftheowdirection(forwardor

reverse)andtheowdirectionaredisplayedonthe

indicator together with the units. The difference of

totalized values between the forward and reverse

ow

ratecanbedisplayed.Totalizationforthere-

verse

owrateiscarriedoutonlywhen“Forwardand

reverseowmeasurementfunctions”isselected.

Damping Time Constant (*2):

The time constant can be set from 1.0 second to

200.0 seconds (63% response). The default is 5

seconds.

When

thedampingtimeisshort,theoutputuctu-

ates. Set the time to 5 seconds or more for control

loop.

Span Setting Function (*2):

Span

owscanbesetinunitssuchasvolumeow

rate,massowrate,time,orowratevalue.The

velocity unit can also be set.

Volume Flow Rate Unit: kcf, cf, mcf, Mgal (US), kgal

(US), gal (US), mgal (US), kbbl (US)*,

bbl

(US)*,mbbl(US)*,μbbl(US)*,Ml

(megaliter), m

, kl (kiloliter), l (liter), cm

Mass Flow Rate Unit (Density must be set): klb

(US), lb (US), t (ton), kg, g

elocity Unit: ft, m (meter)

Time Unit: s (sec), min, h (hour), d (day)

* “US Oil” or “US Beer” can be selected.

Pulse Output (*1)(*2):

Scaled pulse is output one by one according to the

setting of pulse weight.

Pulse

Width:Duty50%orxedpulsewidth(0.05,

0.1, 0.5, 1, 20, 33, 50, 100, 200, 330,

500, 1000, 2000 ms) can be selected.

Output Rate:

0.0001 to 10,000 pps (pulses per

second)

Multi-range Functions (*1)(*2):

Automatic range switching

When

theowrateexceeds100%oftherange,

transition to the next range (up to two ranges) is

carried out automatically. Range switching can be

conrmed

bythestatusoutputandontheindicator.

Forward and Reverse Flow Measurement Func-

tions (*1)(*2):

Flows in both forward and reverse directions can be

measured.

Thereverseowmeasurementcanbe

conrmedbythestatusoutputandontheindicator.

Totalization Switch (*1)(*2):

The status output is carried out when a totalized

value becomes equal to or greater than the set value.

Preset Totalization (*1)(*2):

The parameter setting enables a totalized value to be

preset to a setting value or zero.

Alarm Selection Function (*2):

AlarmsareclassiedintotheSystemAlarms(hard-

ware failure), Process Alarms (such as Signal

Overow

andAdhesionAlarm),SettingAlarms,and

Warnings. Process Alarms and Setting Alarms can be

activated or deactivated for each item. The current

output for an alarm can be selected from the follow-

ing settings. If any System Alarm occurs, turn the

power off and back on again to return to the normal

condition.

System Alarm: 21.6 mA or more, 3.2 mA or less

Process Alarm, Setting Alarm:

1.6 mA or more, 20.5 mA, HOLD

 (xedtothecurrentvaluebefore

the alarm), 4 mA, 3.8 mA, 3.2

mA or less.

The default settings of each alarm are as follows:

Standard

Optional

code C1

System Alarm

21.6 mA or more 3.2 mA or lessProcess Alarm

Setting Alarm

Note: In the case of style: S1 with optional code C1, the

current output is set up to 3.8 mA during Process

Alarms and Setting Alarms.

NE-107 Alarm Message (*2):

Alarmsareclassiedinto4categoriesbyNAMUR

NE-107 and can be displayed.

-F: Failure

-C: Function check

-S:

Outofspecication

-M: Maintenance required

Alarm Output (*1)(*2):

Alarms are generated only for the items selected

via the ‘Alarm Selection Function’ if relevant failures

occur.

Self Diagnosis Functions (*2):

When an alarm is output, details of the System

Alarms, Process Alarms, Setting Alarms, and Warn-

ings

aredisplayedtogetherwiththespecicdescrip-

tion of corresponding countermeasures.

Results

ofmeanowmeasurementduringagiven

period, etc. can be checked by using parameters.

Flow

RateUpper/LowerLimitAlarms(*1)(*2):

Ifaowratebecomesoutofthepredetermined

range, the alarm output is generated.

Electrode Adhesion Diagnosis Function (*1) (*2):

This function enables checking of the adhesion level

of insulating substances to the electrodes. Depend-

ingonthestatusofadhesion,usersarenotiedbya

warning or an alarm via status outputs.

While adhesion diagnosis is being carried out (ap-

proximately 5 minutes), a current of 4 mA is output

because

theowmeasurementisnotperformed.

Adhesion diagnosis should only be carried out when

the

uidvelocityiscompletelyzerobyclosingthe

valve.

When adhesion diagnosis is carried out, change the

control

looptothemanualmoderst.

Data Security during Power Failure:

Data (parameters, totalization value, etc.) storage by

EEPROM. No back-up battery required.

Low Cut (*2):

In this function, the values of the current output along

with LCD indication, totalization, and pulse, which are

corresponding

tosettingspanof0to20%,arexed

at0%(includingreverseow).Thedefaultsettingis

3%.

When the Low Cut point is small, the incorrect output

may

occurattheowrateofzero.SettheLowCut

point to 3% or more. If the span is small, the damping

time

isshortortheuidislowconductivity,theincor-

rect

outputmayeasilyoccurattheowrateofzero.

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