Athena 4000 Series Kullanım Kılavuzu - Sayfa 13

Sıcaklık Kontrolörü Athena 4000 Series için çevrimiçi göz atın veya pdf Kullanım Kılavuzu indirin. Athena 4000 Series 16 sayfaları. Temperature/process controller

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Symptom.
No output.
Probable Cause.
- Open thermocouple or T/C wiring
Symptom
Full output, no control. Power
light stays on
Probable Cause.
- Thermocouple connections reversed
- T/C lead wires shorted between T/C and
control
Symptom. Full output, no control.
Power light goes off.
Probable Cause.
- Relay contacts welded closed
Symptom
Process control temperature
differs from setpoint when read with an
external pyrometer. Display agrees with
setpoint.
Probable Cause.
- T/C lead wires shorted close to process
- Wrong type of T/C being used, etc.
- Standard electrical wiring being used in
place of T/C wire
- Gradient error.
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 display.
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 -
T/C continuity. Disconnect T/C connections from
instrument. Measure T/C circuit resistance. Ohmmeter should
read 100 ohms or less.
Corrective Action
- Replace T/C. Correct defective wiring
Connection polarity. T/C wires are color-coded. Red
Check -
is the negative (-) lead. (for U.S.A.) T/C lead wiring.
Corrective Action
-
Connect correctly
-
Repair or replace
Check -
Disconnect power and load. Measure resistance
between pins 12 and 13. Should read infinity.
Corrective Action -
If resistance reading is near 0 ohms,
replace relay.
Check T/C lead wires at back of probe Wire color
Check -
indicates type of T/C
- Verify type of wire
Corrective Action
- Replace defective wiring
- Install correct T/C for temperature range of instrument. See
instrument serial number tag for T/C type.
- Run only T/C wire between process and controller.
- Use electronic indicator in parallel with suspect instrument's
T/C input
Compare "on time" to "off time"...short on to off time
Check -
indicates too much heater capacity for the process.
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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