Omron E5CJ-R2

Questions and Answers:

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Sandra BurtonAug 16, 2025
Why does hunting not stop on my Omron E5CJ-R2?
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  Lori ParkAug 16, 2025
  Hunting might not stop because the control period is too long for the controlled device's characteristics, causing hunting in sync with the control period. Shorten the control period to resolve this. Alternatively, continuous external disturbances may affect the temperature before a previous disturbance has stabilized. In this case, a 100% improvement may not be possible, but you can widen the stable range to exceed the temperature change so that HT will not be ON.
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josephsamuelAug 25, 2025
How to fix the fluctuating response of Omron E5CJ-R2 Temperature Controller?
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  Alexander BoothAug 25, 2025
  A fluctuating response, alternating between good and bad, may occur if there is a heater or cooling device not controlled by the Temperature Controller's control output (e.g., forced heating or cooling is executed using alarm outputs). In this case, fuzzy self-tuning may not work. Set the control mode to advanced PID and adjust the PID constants manually.
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John EvansAug 31, 2025
What to do if Omron E5CJ-R2 response fails to reach operational requirements?
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  Colleen HarveySep 1, 2025
  If the response fails to reach operational requirements, it could be due to continuous characteristics changes. To address this, you can either adjust the stable range so that fuzzy self-tuning will not be turned ON, or set the control mode to the advanced PID and manually adjust the PID constants. Another reason could be that the response speed of the controlled device is too fast for a sampling period of 500 ms. Note that the Thermac E5 J Temperature Controller cannot support a sampling period of less than 500 ms. Finally, the temperature may be affected by nearby devices. Fuzzy self-tuning does not support countermeasures against interference, so set the control mode to the advanced PID and manually adjust the PID constants.

Omron E5CJ-R2 Specifications

General

Type	Digital Temperature Controller
Size	48 x 48 mm
Dimensions	48 x 48 x 78 mm
Input Type	Thermocouple, RTD
Control Output	Relay, Voltage
Power Supply	100-240 VAC
Communication	RS-485
Control Method	PID
Output Type	Relay
Number of Control Outputs	1 or 2
Setting Resolution	0.1 °C
Ambient Operating Temperature	0 to 55°C