A - 9
A Appendices
Digital Temperature Controllers (Simple Type) User’s Manual (H211)
A-4 Troubleshooting
A
A-4 Troubleshooting
Checking Problems
If the Digital 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.
* Refer to the E5CC/E5EC Digital Temperature Controllers Communications Manual (Cat. No. H175) for details.
Timing Status Meaning Countermeasures
Turning ON
the power for
the first time
The TUNE indicator will
flash.
ST (self-tuning) is in progress
(default setting: ON).
This is not a product fault.
The TUNE indicator flashes during self-tuning.
Temperature error is
large.
Input error (S.Err display)
Input type mismatch Check the sensor type and reset the input type correctly.
Thermometer is not installed
properly.
Check the thermometer installation location and polarity and
install correctly.
Communications are not
possible.*
Non-recommended adapter
is being used.
Make sure that the connected device is not faulty.
During
operation
Overshooting
Undershooting
Hunting
ON/OFF control is enabled
(default: ON/OFF control
selected).
Select PID control and execute either ST (self-tuning) or AT
(auto-tuning).
When using self-tuning, turn ON the power supply to the Digital
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 supply to the Digital
Controller.
Control period is longer
compared with the speed of
rise and fall in temperature.
Shorten the control period. A shorter control period improves
control performance, but a cycle of 20 ms minimum is
recommended in consideration of the service life of the relays.
Unsuitable PID constant Set appropriate PID constants using either of the following
methods.
• Execute AT (autotuning).
• Set PID constants individually using manual settings.
SSR operation fault Use bleeder resistance if the problem is due to leakage
current. Also investigate the errors detected by the HS alarm
function.
Temperature is not rising Specified operation is
unsuitable for required
control (default: Reverse
operation).
Select either forward or reverse operation depending on the
required control. Reverse operation is used for heating
operations.
Heater is burnt out or
deteriorated.
Check whether heater burnout or deterioration have occurred.
Also investigate the errors detected by the heater burnout
alarm.
Insufficient heater capacity Check whether the heater's heating capacity is sufficient.
Cooling system in operation. Check whether a cooling system is operating.
Peripheral devices have heat
prevention device operating.
Set the heating prevention temperature setting to a value
higher than the set temperature of the Digital Controller.
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