Omron E5CZ User Manual page 182

Timing Status
During opera- Overshooting
tion Undershooting
Hunting
Temperature is not
rising
Output will not turn
ON
Temperature Con-
troller will not oper-
ate
Meaning
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 rise cycle of 20 ms minimum is recommended in
and fall in tempera- consideration of the service life of the
ture 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 direct 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 prevention ting to a value higher than the set tempera-
device operating. ture of the Temperature Controller.
Set to STOP Set the RUN/STOP mode to RUN. If STOP
(default: RUN) is lit on the display, control is stopped.
Specified operation Select either direct or reverse operation
is unsuitable for depending on the required control. Reverse
required control operation is used for heating operations.
(default: Reverse
operation)
A high hysteresis is Set a suitable value for the hysteresis.
set for ON/OFF
operation (default:
1.0°C)
Set to STOP Set the RUN/STOP mode to RUN. If STOP
(default: RUN) is lit on the display, control is stopped.
Countermeasures
Appendix A
Page
43
36
43
50
36
50
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