UNI-T UT321 Manual do Utilizador descarregar pdf (Página 3)

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Sensor grounding alarm:

An alarm is output after detecting a change in

control output. If the moving average * of

control output is out of the setting range

(between the high and low limits of the on/off

rate) in spite of the deviation being within a

fixed range (on/off rate detection band) and

control being in stable condition, the sensor is

judged to be in a grounding condition.

* Moving average refers to the average value for output

values sampled (five times) in every cycle time.

High- and low-limit setting range of on/off rate:

–5.0 to 105.0% of output range

Detection band of on/off rate:

0.0 to 100.0% of PV input range span

Fault diagnostic alarm:

Input burnout, A/D conversion error,

thermocouple RJC error

FAIL output: Abnormality in software or hardware.

When in Fail status, control output, retrans-

mission output and alarm output become 0%

or OFF.

● Display and Operation Functions

PV display: 4-digit digital display for engineering data

Setpoint display:

Various data, such as the setpoint (SP), are

displayed by selection on the 4-digit digital

display.

Status indication:

Alarm indicator lamp

3 lamps: AL1, AL2 and AL3

Setpoint number indicator lamp:

3 lamps: SP2, SP3 and SP4 (not lit when SP1

is selected)

MAN operation mode lamp: MAN (lit in MAN mode)

PV display color changing function “Active Color PV

Display” :

(Factory-set default : Fixed in red mode)

This function automatically changes PV

display color by the action described below.

Green-to-red or red-to-green changing action

is selectable.

Link to alarm 1 mode :

Alarm OFF : green, Alarm ON : red

Setting of Alarm OFF : red, Alarm ON :

green is possible.

Link to alarms 1 and 2 mode :

Alarm OFF : green, Alarm ON : red

Setting of Alarm OFF : red, Alarm ON :

green is possible.

SP deviation mode :

Within the preset SP deviation : green,

Out of the preset SP deviation : red

Setting of within the preset SP deviation :

red, Out of the preset SP deviation : green is

possible.

Deviation band is changeable using a

parameter. The setting of either high limit

deviation or low limit deviation is also

possible.

PV limit mode :

Within the preset PV range : green,

Out of the preset PV range : red

Setting of Within the preset PV range : red,

Out of the preset PV range : green is

possible.

The range (high limit and low limit) is

changeable using a parameter.

Fixed color mode :

PV display color is fixed in green or red.

Operation keys:

쑶 and 쑴 keys:

Increase or decrease setpoints and various

parameters.

SET/ENT key:

Sets setpoint data, calls or selects various

parameters.

A/M key: Switches operation mode (Auto/Man)

SELECT display:

Allows selection and registration of frequently

changed parameters from the operating

parameters during operation.

For example, if the alarm-1 setpoint is

registered in the SELECT display, the setpoint

can easily be displayed during operation.

Security function:

Operation can be inhibited by a password.

Status lamps

Indicate alarm status (AL1, 2, 3), manual operation

(MAN), setpoint No. (SP2, 3, 4) in use.

LED display unit (for PV)

Displays PV and error codes when

errors are detected.

Active color PV display

Indication in green or red color.

LED display unit (for SP)

Displays setpoints (SP), output values,

or setting items/values of parameters.

Operation keys

Increase/decrease the setting data (쑶,쑴).

Select parameter/Enter the setting data (SET/ENT).

Select Auto/Manual operation mode (A/M).

Communication port for light loader

Parameters are set via communication

from a personal computer.

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