Athena 2000 Series Manual de instrucciones - Página 11
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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
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