Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 138)

<10. ACTUAL OPERATION>

10-1

IM 01E30D01-01EN

Afteryouhaveinstalledtheowtubeintothe

process piping, wired the input/output terminals,

set up the required parameters, and performed

a pre-operation zero adjustment, the magnetic

owmetershouldoutputanaccurateowsignal

fromitsterminalsassoonasowoftheuidtobe

measured begins.

IMPORTANT

Warm up the instruments for at least 30 minutes.

Performowmeasurement30minutesafter

turning on the power.

This section describes zero adjustment and the

corresponding procedures.

10.1 Pre-operation Zero

Adjustment

Zero adjustment is carried out to ensure that the

outputforzeroowis0%.Althoughadjustmentto

zero is performed at the manufacturing plant prior to

shipment, this procedure must be carried out once

again following the installation of piping in order

tomatchthemagneticowmetertoitsoperating

conditions.

This section describes the zero adjustment

procedure using display unit switches from the

converter and using the external status input;

accordingly, one of these methods should be

selected and implemented.

10. ACTUAL OPERATION

IMPORTANT

• Zero adjustment should be carried out

before actual operation. Note that parameter

settings and update functions cannot be

carried out during this procedure (i.e., for

approximately 450 seconds).

• Zero adjustment should only be carried out

whentheowtubehasbeenlledwiththe

measurementuid,wait10minutes,andthe

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

the valve.

• Eachtimethattheuidbeingmeasured

is changed, it will be necessary for zero

adjustmenttobecarriedoutforthenewuid.

• While zero adjustment is being carried out,

normally a current of 10.4 mA is output.

Since the current of 10.4 mA is output, when

zeroadjustmentiscarriedout,rstchange

the control loop to the manual mode, and

then set this parameter.

• Zero adjustment cannot be carried out during

occurring various alarms.

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