Athena 3020 Series 사용 설명서 - 페이지 11

{카테고리_이름} Athena 3020 Series에 대한 사용 설명서을 온라인으로 검색하거나 PDF를 다운로드하세요. Athena 3020 Series 20 페이지. Analog temperature controllers

Adjustments

wise (- direction) for high temperature as indicated by the

deviation meter.

NOTE: If close control cannot be obtained after carefully

repeating the above procedures, check to see if the thermo-

couple probe is in good contact with the heated process, and

if the heaters are correctly sized for the application.

Applications involving large changes in setpoint operating

temperature, or large load changes, will require readjustment

of the proportional band and offset (manual reset) pots.

How to Set the Alarm

Deviation alarms are triggered when the temperature devi-

ates from the setpoint by a predetermined amount. Units can

be ordered with either high, low, or high/low alarms.

1. Turn the adjustment clockwise to widen the span

between the process setpoint and the alarm, or

counterclockwise to narrow it. (Full clockwise

should be about 50 °F (30 °C) from setpoint. Full

counterclockwise should be only 5 °F (3 °C) from

setpoint.

2. To check the actual alarm point, simply change

the setpoint until the deviation meter reads zero.

Then move it downward (for high alarm) or

upward (for low alarm). When the alarm is trig-

gered, check the deviation meter -- it will show

deviation in the amount you've set on the alarm.

Optional 3-Mode (PID)

How to Set Reset, Proportional Band, and Rate

Auto reset action automatically, but slowly, corrects droop

error in proportionally controlled processes. Ideal reset time

is one half the period of oscillation of the process. Slower set-

tings are safe, but sluggish. Faster settings will cause contin-

uous oscillation.

1. For slow processes, move switches 1 and 2 off,

set rate slow, proportional band wide, and go to

Step 4. Otherwise:

2. Set reset time (internal switches are indicated on

automatic reset switch chart below). Use the

fastest time (0.8 minutes) for very fast processes,

1 minute for most others, as a first try.

3. Set the proportional band to full wide (270°

clockwise). Make sure rate is full fast, turned full

clockwise, as well.)

4. Plug controller in, turn your process on.

5. Observe warm-up. If the process overshoots set-

point and cycles in continually decreasing waves