Omron E5CJ-R2 - User Manual

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.
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Brian EvansNov 8, 2025
Why doesn't the Omron E5CJ-R2 Temperature Controller reach the set point?
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  Jenny FriedmanNov 8, 2025
  The temperature might not reach the set point because the dead time measured was longer than the actual value, leading to inappropriate PID constants. This can occur if the load (like a heater) was turned on after the Temperature Controller started. To resolve this, execute SRT again by setting the control mode to advanced PID with a proportional band of 0.1°C, then set the control mode to advanced PID with fuzzy self-tuning again. Wait until the control system's temperature is stable, then turn on the Temperature Controller and the load simultaneously, or turn on the load first for SRT. Another reason could be that the PID constants were changed from the ideal value because HT is continuously ON when there was a periodic temperature change larger than the stable range due to an external d...

Summary

Introduction to Thermac E5 J Temperature Controller

1-1 Features

1-3 Specifications

Details technical specifications for E5J, E5AJ, E5EJ, and E5CJ models.

Sensor and Mode Settings

2-2 Output Units

2-3 Internal Switch Settings

Details various internal switch settings like alarm mode, input type, key protection, standby sequence, and function selector.

Fuzzy Self-tuning

4-1 Fuzzy Self-tuning Operation

Explains the three features: Step Response Tuning (SRT), Disturbance Tuning (DT), and Hunting Tuning (HT).

4-2 Troubleshooting

Provides troubleshooting steps for when fuzzy self-tuning operation is not smooth.

Installation and Wiring

5-1 Installation

Guides on where and how to install the E5J Temperature Controller.

5-2 Wiring

Provides wiring precautions and methods for connecting the controller.

5-3 Terminal Arrangement

Troubleshooting

6-1 Error Display and Output

6-2 Troubleshooting

Provides a table for troubleshooting common operational issues and their solutions.

Heater Burnout Detection

8-1 Heater Burnout Detection

Describes the mechanism for detecting heater burnout using a current transformer.

8-2 Heater Burnout Procedures

Outlines steps for heater burnout detection and resetting the alarm.

8-4 Heater Burnout Alarm Value

Explains how to set and obtain the heater burnout alarm value, including setting examples.

Engineering Level Settings

9-1 Engineering Level

9-2 Engineering Level Parameter List

9-3 Engineering Level Parameters

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