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Caution – Dwyer SCZ10 User Manual

Page 9

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3.6 Control output manipulated variable indication

Name and Description

Control output manipulated variable indication
Press the

key for approx. 3 seconds during PV/SV indication mode.

Keep pressing the

key until the output manipulated variable shows up, though the main

setting mode appears during the process.

(The control output manipulated variable is indicated on the SV display and the decimal point at

the second digit blinks in 0.5 seconds cycle.)

Pressing the

key again, it reverts to the PV/SV mode.

4. Converter function

The converter function of this instrument converts each input (Thermocouple, RTD, DC voltage and

DC current input) value to 4 to 20mA and outputs taking advantage of the control parameter of the controller.

When this instrument is used as a converter, follow the process (1) to (7) described below.

When the process (1) to (7) is finished, this can be used as a converter.

(1): Wire and connect this instrument. (Power, Input and Output)

(2): Turn the power of this instrument ON.

(3): Call the “Secure Menu" by pressing the

and

key (for approx 3s).

(4): Select the sensor type from “Sensor selection (

)”.

(5): Set the high limit of the value which is going to be converted from “Scaling high limit setting (

)".

(6): Set the low limit of the value which is going to be converted from “Scaling low limit setting (

)”.

(7): Select converter (

) from “Control/ Converter” function selection (

)”.

• Outputs the input from scaling low limit setting value to high limit value in 4 to 20mA.

The ratio of the changing quantity resolution is 1 to 1000 to scaling span.

• When functioning alarm action by Converter function, set the alarm action to Process

alarm action.

If converter function is selected from “Controller/Converter function selection” in the Secure Menu, the
parameter below is automatically set. (Table 4.1-1). But this is applied only to the DC current output type.

(Table 4.1-1)

Setting item

Setting value

Setting item

Setting value

Main setting

Scaling low limit

Alarm setting

0

Proportional band setting

100.0%

Loop break alarm time setting

0 seconds

Integral time

0 seconds

Loop break alarm action span

0

Derivative time

0 seconds

Direct/Reverse action selection

Direct action

Manual reset setting

0.0

• How to fine-tune DC current output (4 to 20mA)

Carry out zero, span adjustment from zero side several times.
Carry out adjustment set by manual reset.

(1) Input the value so that the same scaling low limit value may be indicated on the PV display.
(2) Adjust the value so that the DC current output value may become 4mA by increasing

and decreasing manual reset value. Output decreases when manual reset value is set
to+ side, on the other hand output increases when it is set to – side.

Carry out adjustment of span in the proportional band

(1) Input the value so that the same scaling high limit value may be indicated on the PV display.
(2) Adjust the value so that the DC current output value may become 20mA by increasing

and decreasing manual reset value. Output decreases when proportional band value
is set to + side, on the other hand output increases when it is set to – side.

Caution

When shifting from converter function to controller function, the control parameter and values set by
converter function are held as they are even if the function is switched to controller function.
So, correct the control parameter and values set by converter function to the value necessary to the
controller function after switching to the controller function.