Yokogawa EJA440E Bedienungsanleitung PDF herunterladen (Seite 19)

<3. Operation>

3-11

IM 01C25T03-01E

d. Setting Static Pressure Unit and Scale

(D30: SP UNIT, D33: SP LRV, and D34: SP

URV)

Static pressure can be displayed in measured

input static pressure or in %, independent from

the 4-20 mA output signal of measured pressure

or differential pressure. These parameters allow

the entry of the static pressure unit and scale to be

displayed.

Note that the parameter D37: SP SELECT can be

used to select either the high or low pressure side of

the capsule to monitor the static pressure.

(7) Unit Setup for Displayed Temperature

(D40: TEMP UNIT)

When the instrument is shipped, the temperature

units are set to degC. Follow the procedure

below to change this setting. Note that changing

the unit here changes the unit for A30: CAPSULE

TEMP (capsule temperature) and J45: AMP TEMP

(amplier temperature).

• Example: Change the unit for the temperature

display degC to degF.

ESC

SET

D40:TEMP UNIT

degC

< degC >

< degF >

< K >

Use the or key

to select degF.

Press the key twice to

enter the setting.

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Then press the (OK) key.

(8) Operation Mode Setup

(D22: REV OUTPUT)

This parameter allows the direction of the 4-20 mA

output to be reversed with respect to input. Follow

the procedure below to make this change.

• Example: Change 4 to 20 mA output to 20 to

4 mA output.

ESC

SET

D22:REV OUTPUT

NORMAL

< NORMAL >

< REVERSE>

Use the or key

to select REVERSE.

Press the key twice to

enter the setting.

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Then press the (OK) key.

(9) Impulse Line Connection Orientation

Setup

(D15: H/L SWAP)

This function reverses the impulse line orientation.

Follow the procedure below to make this change.

• Example: Assign the high pressure impulse

line connection to the L side of

the transmitter.

ESC

SET

D15:H/L SWAP

NORMAL

< NORMAL >

< REVERSE>

Use the or key

to select REVERSE.

Press the key twice to

enter the setting.

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Then press the (OK) key.

(10) CPU Failure Burnout Direction and

Hardware Write Protect

(D25: BURNOUT)

There are two slide switches on the CPU assembly

board. One sets the burnout direction at CPU

failure, and the other sets a write protection function

which disables parameter changes through

the use of a handheld terminal or some other

communication method.

HIGH LOW

CPU assembly

Slide switch

Burnout direction switch

Write protection switch

Write Protection

Switch Position

Burnout Direction

Switch Position

BO H L

WR E D

H L

E D

H L

E D

H L

E D

H L

E D

Hardware write protection switch (WR)

Burnout direction switch (BO)

Burnout Direction

Write Protection

YES

(Write disabled)

(Write enabled)

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The parameter D25: BURNOUT displays the status

of 4-20 mA DC output if a CPU failure occurs. In

case of a failure, communication is disabled.

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