E5CNH E5AN-H E5EN-H Digital Controllers User's Manual - OMRON

Troubleshooting
Appendix
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 Meaning Countermeasures Page
Turning ON the
power for the
first time
During operation
Temperature unit
(°C/°F) is flashing.
Temperature error is
large.
Input error (S.Err display)
Communications are
not possible.
Overshooting
Undershooting
Hunting
Temperature is not
rising
ST (self-tuning) is in
progress (default
setting: ON).
This is not a product fault. The temperature
unit (°C/°F) flashes while ST (self-tuning) is
being performed
Input type mismatch Check the sensor type and reset the input
type correctly.
Thermometer is not
installed properly.
Non-recommended
adapter is being
used.
ON/OFF control is
enabled
Control cycle is
longer compared
with the speed of
rise and fall in temperature
Unsuitable PID constant
HS alarm operation
fault
Specified operation
is unsuitable for
required control
(default: Reverse
operation)
Heater is burnt out or
deteriorated.
Insufficient heater
capacity
Cooling system in
operation.
Peripheral devices
have heat prevention
device operating.
Check the thermometer installation location
and polarity and install correctly.
Make sure that the connected device is not
faulty.
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 selftuning
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.
Shorten the control cycle. A shorter control
cycle improves control performance, but a
cycle of 20 ms minimum is recommended in
consideration of the service life of the
relays.
Set appropriate PID constants using either
of the following methods.
Execute AT (autotuning).
Set PID constants individually using manual
settings.
Use breeder resistance if the problem is
due to leakage current. Also investigate the
errors detected by the HS alarm function.
Select either forward or reverse operation
depending on the required control. Reverse
operation is used for heating operations.
Check whether heater burnout or deterioration
have occurred. Also investigate the
errors detected by the heater burnout
alarm.
Check whether the heater’s heating capacity
is sufficient.
Check whether a cooling system is operating.
Set the heating prevention temperature setting
to a value higher than the set temperature
of the Digital Controller.
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Section 1 of
Communications
Manual
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