UNI-T UT321 Manual do Utilizador descarregar pdf (Página 2)

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GS 05D01D12-02E 4th Edition Mar. 01, 2005-00

“SUPER2” function:

The function stabilizes the state of control that

is unstable due to hunting, etc. without

requiring any change in PID constants, when

the load and/or gain varies greatly, or when

there is a difference between the characteris-

tics of temperature zones.

Control Parameters Setting Range

Proportional band = 0.1 to 999.9%

0.0 to 999.9% for heating/cooling control,

0.0% for ON/OFF control

Integral time = 1 to 6000 s, or OFF (manual reset)

Derivative time = 1 to 6000 s, or OFF

Manual reset value = –5.0 to 105.0% of output range

(Functions when integral time is off.)

ON/OFF control hysteresis = 0.0 to 100.0% of PV input

range span (0.1 to 0.5% for heating/cooling

control)

Setpoint rate-of-change setting = OFF, or 0.0 to 100.0%/h

or min of PV input range span

A PV tracking function operates automatically

when the setpoint is changed, the power is

turned on, or the mode is changed from

manual to automatic.

Direct/reverse action:

The output increase/decrease direction can be

defined corresponding to a positive or

negative deviation.

For heating/cooling control, it is fixed; reverse

for the heating-side output, direct for the

cooling- side output.

Anti-reset windup:

When controller output is limited, normal

integration is superseded by an anti-reset

windup computation to suppress over-

integration.

Control output cycle time = 1 to 1000 s for Time-

proportional PID control (The cooling-side

output cycle time is also the same when

heating/cooling control is used.)

Preset output value = –5.0 to 105.0% of output range

Output tracking=Whether the output bump is provided or

not can be selected by changing the PID

control mode.

Output limiter

Upper limit = Lower limit to 105.0% of output

range

Lower limit = –5.0% of output range to upper

limit

Heating/cooling dead band = –100.0 to 50.0% for output

range

● Signal Computation Functions

PV input computation:

Bias addition (–100.0 to 100.0% of PV input

range span), and first-order lag filter (time

constant OFF or 1 to 120 s)

Contact input function:

Target setpoint selection, Auto/Man operating

mode switching, key lock parameter show/

hide switching

Target setpoint selection can be done for

either a 2-setpoint or 4-setpoint selection.

• If the 2-setpoint selection is set, Auto/Man

mode switching can be used as well.

• If the 4-setpoint selection is set, Auto/Man

switching and key lock parameter show/hide

switching cannot be used together.

If key lock parameter show/hide switching is used, target

setpoint selection and Auto/Man mode

switching cannot be used.

● Alarm Functions

Twenty-four types of alarm functions are provided. The

alarm status is indicated by the alarm lamp on the front

panel. Also, three points among them can be output as relay

contact outputs.

Alarm types:

PV high limit, PV low limit, Deviation high

limit, Deviation low limit, De-energized on

deviation high limit, De-energized on

deviation low limit, Deviation high and low

limits, High and low limits within deviation,

De-energized on PV high limit, De-energized

on PV low limit, SP high limit, SP low limit,

Output high limit, Output low limit, Deviation

high limit for target setpoint, Deviation low

limit for target setpoint, De-energized on

deviation high limit alarm for target setpoint,

De-energized on deviation low limit alarm for

target setpoint, Deviation high and low limits

fot target setpoint, Deviation within high and

low limits for target setpoint, Heater burnout

alarm, Sensor grounding alarm, Fault

diagnostic alarm, and FAIL output.

Alarm output:

3 points. Any three points among the above

alarms can be output as contact outputs . For

heating/cooling control, if cooling-side output

is output as a relay contact, up to two alarm

outputs can be used.

Setting ranges for PV, deviation, setpoint and output alarms:

PV/setpoint alarm:

–100.0 to 100.0% of PV input range

Deviation alarm:

–100.0 to 100.0% of PV input range span

Output alarm:

–5.0 to 105.0% of output range

Alarm hysteresis:

0.0 to 100.0% of PV input range span

Delay timer:

0.00 to 99.59 (minute, second)

An alarm is output when the delay timer

expires after the alarm setpoint is reached.

Setting for each alarm is possible.

Stand-by action:

Stand-by action can be set to make PV/

deviation alarm OFF during start-up or after

SP change until SP reaches the normal region.

Heater burnout alarm (optional):

Two circuits incorporated.

A heater burnout alarm is output if the heater

current consumption is the burnout detection

value or less. This alarm can be used for

Relay ON/OFF control or time-proportional

PID control.

Heater current setting range: 0.0 to 50.0 A

Heater current measuring accuracy: ±5% of span ± 1

digit

Heater current detecting resolution: 0.5 A

Time required until burnout detection is on: 0.13 s

minimum

Burnout sensor model: CTL-6-S-H (URD Co. Ltd.)

Burnout sensor is provided separately.

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