Athena 2000 Series Instrukcja obsługi - Strona 13

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Symptom.

Temperature overshoots, or

oscillates

Probable Cause.

Process overpowered

Bandwidth too narrow

Process or sensor lag

Symptom.

Process control temperature

stabilizes above or below set- point as

read on deviation meter

Probable Cause.

- Offset (manual reset) incorrectly adjusted

- Partial short to ground in heater when

used on 240 V line

- No output from suspect control

- Controller reading other zones of multi-

controlled process

- Full output from suspect control

- Apparent stabilization from other zones of

multi-controlled process

- Improperly sized heater

Check -

Check bandwidth

Loose heater or sensor fit. Poor relative location.

Corrective Action

- Reduce total heater power

- Widen band

- Improve fit, locate closer together

Check -

Offset (manual reset) Heater to ground resistance.

Design parameters for process heat required

Corrective Action

- Adjust (+) to increase controlled temp. (-) to decrease temp.

- Replace defective heater