Troubleshooting - Omron E5C User Manual

A-5 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.
Timing Status
Turning The TUNE indicator will
ON the flash.
power for
the first
Temperature error is
time
large.
Input error (S.Err display)
Communications are not
possible.
During Overshooting
operation Undershooting
Hunting
Temperature is not rising
@
* Also refer to the E5 C Digital Controllers Communications Manual (Cat. No. H175) for details.
E5@C Digital Temperature Controllers User's Manual (H174)
Meaning
ST (self-tuning) is in This is not a product fault.
progress (default setting: The TUNE indicator flashes during self-tuning.
ON).
Input type mismatch Check the sensor type and reset the input type correctly.
Thermometer is not Check the thermometer installation location and polarity
installed properly. and install correctly.
Non-recommended Make sure that the connected device is not faulty.
adapter is being used.
ON/OFF control is Select PID control and execute either ST (self-tuning) or
enabled (default: ON/OFF AT (auto-tuning).
control selected). 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 Shorten the control period. A shorter control period
compared with the speed improves control performance, but a cycle of 20 ms
of rise and fall in minimum is recommended in consideration of the service
temperature. 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.
HS alarm operation fault Use breeder resistance if the problem is due to leakage
current. Also investigate the errors detected by the HS
alarm function.
Specified operation is Select either forward or reverse operation depending on
unsuitable for required the required control. Reverse operation is used for heating
control (default: Reverse operations.
operation).
Heater is burnt out or Check whether heater burnout or deterioration have
deteriorated. occurred. Also investigate the errors detected by the
heater burnout alarm.
Insufficient heater Check whether the heater's heating capacity is sufficient.
capacity
Cooling system in Check whether a cooling system is operating.
operation.
Peripheral devices have Set the heating prevention temperature setting to a value
heat prevention device higher than the set temperature of the Digital Controller.
operating.
A Appendices
Countermeasures Page
4-26
4-12
2-13,
2-21,
2-26
*
4-24
4-15
4-24
4-41
4-15
A
4-39
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