Autonics TZN4L Посібник - Сторінка 11

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TZN/TZ Series

Functions

Auto tuning [ AtT ]

PID auto tuning function automatically measures the

thermal characteristics and response of the control system

and then executes its value under high response & stability

after calculating the time constant of PID required to control

optimum temperature.

● Execute the auto tuning function at initial time after

connecting the controller & the sensor.

● Execution of auto tuning is started when pressing AT key

for 3 sec. or more.

● When the auto tuning is started, AT lamp will flash, and

when the lamp is OFF, this operation will stop.

● While the auto tuning function is executing, it is stopped

by pressing AT key for 5sec. or more.

● When the power turns off or the stop signal is applied

while auto tuning function is executing, time constant of

PID is not changed and it remembers the value before

power turns off.

● Time constant of PID selected by auto tuning function

can be changed in parameter 1 group.

● It has two kinds of auto tuning mode auto tuning

operation is executed at setting value(SV) in TUN1 mode

which is factory default. Auto tuning operation in TUN2

mode is executed in 70% of setting value(SV). Mode

change is available in

(tun 1 mode)

℃

(tun 2 mode)

℃

70% of SV

● Execute the auto tuning function again periodically,

because the thermal characteristics for the control object

can be changed when the controller is used continuously

for a long time.

Sub output [ EU-1 , EU-2 ]

Sub output can execute as main control output and sub

function as well. There is one sub output in this unit.

● This sub output is relay "1a" contact output.

● 1 mode can be selected among 7 kinds of alarm mode or

LBA operated when the heater line is cut, SBA operated

when the sensor line is cut.

● The Sub output can be latched ON or automatically reset

depending on the alarm option mode selected.

● When the sensor line or the heater line is cut, SBA or

LBA output turns on. This "Output on" status must be

reset by turning the power off.

H-82

of the parameter 2 group.

AtT

Auto tuning time

Time(t)

Auto tuning time

Time(t)

Sensor Break Alarm [ SBA ]

This function causes the sub output to turn on when the

sensor line is cut or open. It is easier to check that whether

the sensor line is cut or not through buzzer or etc by

exterior sub output (relay contact).

● For using SBA function, set SBA at EU-1 or EU-2 in

parameter 2 group and SBA output operates as EV1 OUT

or EV2 OUT contact.

Loop Break Alarm [ LBA ]

LBA function is to diagnose an abnormal temperature of

the control system. If the temperature of the control system

is not changed within ±2℃ during setting time of LBA, the

LBA output will be ON.

Ex) When setting value(SV) is 300℃, process value(PV) is

50℃, this unit controls 100%. In this time if there is no

change of system temperature, it recognizes Heater is

cut off then LBA output will be ON.

● LBA output can be selected at EV1 of the parameter 2

group.

● If LBA output is not selected at event output, it will not be

displayed in parameter 1 group.

● Set range of LBA: 1 to 999 sec.

● If thermal response of the control system is slow, LBA

value should be set to a high value.

● LBA output operates when the manipulated value of the

controller is 0% and 100%.In case the LBA output is ON,

please check the following;

① Short-circuit or cutting of the temp. sensor.

② Abnormal condition of the equipment

(magnet, sub-relay, etc.)

③ Abnormal condition of the load(heater, cooler)

④ Wrong-wiring or cutting of the other cables.

● Once SBA is ON due to broken sensor, it will not reset,

although sensor is connected. In this case, turn off the

power then turn on again.

Error

If error is occurred while the controller is operating,it will be

displayed as follow.

● LLLL is flashing when measured input temperature is

lower than input range of the sensor.

● HHHH is flashing when measured input temperature is

higher than input range of the sensor.

● OPEN is flashing when the input sensor is not connected

or its wire is cut.