Troubleshooting - Omron E5CN User Manual

Troubleshooting

Checking Problems
If the Temperature Controller is not operating normally, check the following points before requesting repairs. If
the problem persists, contact your OMRON representative for details on returning the product.
Timing Status
Turning ON the Temperature unit
power for the (°C/°F) is flashing.
first time
Temperature error is
large.
Input error (S.Err dis-
play)
Communications are
not possible.
During opera- Overshooting
tion Undershooting
Hunting
Temperature is not
rising
262
Meaning
ST (self-tuning) is in This is not a product fault. The temperature
progress (default unit (°C/°F) flashes while ST (self-tuning) is
setting: ON). being performed
Input type mismatch Check the sensor type and reset the input
type correctly.
Thermometer is not Check the thermometer installation location
installed properly. and polarity and install correctly.
Non-recommended Make sure that the connected device is not
adapter is being faulty.
used.
ON/OFF control is Select PID control and execute either ST
enabled (default: (self-tuning) or AT (auto-tuning).
ON/OFF control When using self-tuning, turn ON the power
selected). supply to the Temperature Controller and
load (heater, etc.) at the same time, or turn
ON the load power supply first. Accurate
self-tuning and optimum control will not be
possible if the power supply to the load is
turned ON after turning ON the power sup-
ply to the Temperature Controller.
Control cycle is Shorten the control cycle. A shorter control
longer compared cycle improves control performance, but a
with the speed of cycle of 20 ms minimum is recommended in
rise and fall in tem- consideration of the service life of the
perature relays.
Unsuitable PID con- Set appropriate PID constants using either
stant of the following methods.
• Execute AT (autotuning).
• Set PID constants individually using man-
ual settings.
HS alarm operation Use breeder resistance if the problem is
fault due to leakage current. Also investigate the
errors detected by the HS alarm function.
Specified operation Select either forward or reverse operation
is unsuitable for depending on the required control. Reverse
required control operation is used for heating operations.
(default: Reverse
operation)
Heater is burnt out or Check whether heater burnout or deteriora-
deteriorated. tion have occurred. Also investigate the
errors detected by the heater burnout
alarm.
Insufficient heater Check whether the heater's heating capac-
capacity ity is sufficient.
Cooling system in Check whether a cooling system is operat-
operation. ing.
Peripheral devices Set the heating prevention temperature set-
have heat preven- ting to a value higher than the set tempera-
tion device operat- ture of the Temperature Controller.
ing.
Countermeasures
Appendix
Page
52
40
25
Section 1 of
Communi-
cations
Manual
50
42
50
42
42
42
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