Athena 2000 Series Manuel d'utilisation - Page 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
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