Omron E5AC-T

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Table of Contents

Questions and Answers:

B
Blake CaldwellAug 17, 2025
Why is my Omron E5AC-T overshooting, undershooting, or hunting?
- S
  Steven WatsonAug 18, 2025
  If your Omron Temperature Controller is showing overshooting, undershooting or hunting, it could be due to several reasons. First, if ON/OFF control is enabled, select PID control and perform autotuning. Second, if the control period is too long compared to the temperature's rise and fall speed, shorten the control period. Third, unsuitable PID constants can cause this issue; execute AT (autotuning) or manually set appropriate PID constants. Finally, an HS alarm operation fault may be the cause; use breeder resistance if leakage current is the problem and investigate errors detected by the HS alarm function.
E
Elizabeth BarnettAug 22, 2025
What to do if Omron Temperature Controller shows a large temperature error (S.Err)?
- S
  simmonsbarryAug 22, 2025
  If your Omron Temperature Controller displays a large temperature error or an input error (S.Err), check the sensor type and reset the input type correctly. Also, ensure the thermometer is installed properly, checking its installation location and polarity. Make sure that the connected device is not faulty.
Q
qperryAug 25, 2025
Why is the temperature not rising in my Omron E5AC-T?
- A
  Ashley DicksonAug 26, 2025
  If the temperature is not rising on your Omron Temperature Controller, first, ensure that the specified operation (forward or reverse) is suitable for the required control. Check for heater burnout or deterioration and verify the heater's heating capacity is sufficient. Also, check if a cooling system is in operation. Finally, ensure that any peripheral devices with heat prevention are set to a value higher than the set temperature of the Digital Controller.
T
Tina GreerAug 27, 2025
Why won't my Omron E5AC-T Temperature Controller operate?
- A
  Alyssa GarciaAug 28, 2025
  If your Omron Temperature Controller will not operate, ensure the Run/Reset parameter is set to Run. Check whether the thermometer has burnt out or short-circuited. Ensure thermometer lead wires and power lines are in separate conduits, or wired using a more direct path. The connection between the Digital Controller and thermocouple should use the thermocouple’s lead wires directly, or compensating conductors suitable for the thermocouple. Verify the thermometer's installation location is suitable and set a suitable input shift, or set the input shift value to 0.0 if not required.
K
Kenneth KingAug 30, 2025
Why won't the output turn on in my Omron E5AC-T?
- H
  Hannah Barnes MDAug 30, 2025
  If the output of your Omron Temperature Controller will not turn ON, ensure the Run/Reset parameter is set to Run. Select either forward or reverse operation depending on the required control. Set a suitable value for the hysteresis. Supply the specified power from the terminals, as the output will not turn ON while the Digital Controller is being operated with power supplied through the USB-Serial Conversion Cable.
J
Jonathan MolinaSep 1, 2025
Why is the control unstable on my Omron E5AC-T?
- J
  Johnny JonesSep 1, 2025
  If the control is unstable on your Omron Temperature Controller, retighten terminal screws to a torque of 0.43 to 0.58 N·m. If the internal components have reached the end of their service life, replace the Digital Controller and all other Digital Controllers purchased in the same time period.
S
Susan TaylorSep 4, 2025
How to unlock Omron E5AC-T Temperature Controller keys?
- D
  david95Sep 4, 2025
  If the keys on your Omron Temperature Controller will not operate, turn OFF setting change protect.
E
eugene02Sep 6, 2025
Why can't I shift levels on my Omron E5AC-T Temperature Controller?
- M
  Matthew PorterSep 7, 2025
  If you cannot shift levels on your Omron Temperature Controller, set the operation/adjustment protect, initial setting/communications protect, and setting change protect values as required.
K
kimberlyjohnsonSep 9, 2025
Why isn't the SP changing as programmed on my Omron E5AC-T Temperature Controller?
- S
  spencebrianaSep 9, 2025
  If the SP (Set Point) does not change as programmed on your Omron Temperature Controller, set Program SP Mode.
M
Marcus JohnsonSep 12, 2025
Why isn't the segment advancing on my Omron Temperature Controller?
- J
  Jason FrederickSep 12, 2025
  If the segment does not advance on your Omron Temperature Controller, set the wait band correctly.

Omron E5AC-T Specifications

General

Model	E5AC-T
Type	Temperature Controller
Number of Inputs	1
Number of Outputs	1
Ambient Operating Temperature	0 to 55 °C
Input Type	Thermocouple, RTD
Output Type	Relay, Voltage, Current
Control Method	PID Control
Power Supply	100 to 240 VAC
Weight	200 g
Communication	RS-485

Summary

Introduction

1-1 Appearance, Features, and Functions of the E5@C-T

Provides an overview of the controller's appearance, features, and main functions.

1-2 IO Configuration and Model Number Legend

Details the controller's I/O configuration and explains the model number legend.

Preparations

2-1 Installation

Covers instructions and considerations for installing the digital temperature controllers.

2-2 Using the Terminals

Explains how to connect and use the controller's various terminals for wiring.

2-4 Using the Setup Tool Port

Details the procedure for connecting and using the setup tool port for configuration.

Part Names and Basic Procedures

3-1 Basic Application Flow

Outlines the fundamental steps and flow for using the digital controller.

3-2 Power ON

Explains the procedure for turning on the digital controller and initial display.

3-3 Part Names, Part Functions, and Setting Levels

Identifies controller parts, their functions, and the various setting levels.

3-4 Procedures after Turning ON the Power Supply

Details the basic steps to follow after the controller is powered on.

Basic Operation

4-1 Moving between Setting Levels

Explains how to navigate through different setting levels of the controller.

4-2 Initial Setup Examples through Starting Program Operation

Provides examples for initial setup and starting program operations.

4-3 Setting the Input Type

Guides users on how to configure the correct input type for the controller's sensor.

4-5 Selecting PID Control or ONOFF Control (Not Supported for Position-proportional Models.)

Details how to select between PID and ON/OFF control methods.

4-7 Setting Programs

Explains how to create and set up programs for temperature control.

Advanced Operations

5-1 Shifting Input Values

Describes how to adjust input values for sensor compensation.

5-4 Using Event Inputs

Explains how to utilize event inputs for various control functions.

5-11 Performing Manual Control

Guides users on how to perform manual control operations.

5-13 Using PID Sets

Details how to manage and use multiple PID sets for different control scenarios.

Parameters

6-1 Conventions Used in this Section

Explains conventions and icons used within the Parameters section.

6-3 Operation Level

Describes the operation level for performing control operations and monitoring values.

6-5 Adjustment Level

Provides access to basic controller parameters like PID constants and heating/cooling settings.

6-9 Initial Setting Level

Covers setting basic controller specifications like input type and alarm modes.

User Calibration

7-1 User Calibration

Explains the process and considerations for user calibration of inputs and outputs.

7-3 Thermocouple Calibration

Provides steps for calibrating thermocouple inputs, including group 1 and 2.

7-4 Resistance Thermometer Calibration

Guides on calibrating resistance thermometer inputs using a precision resistance box.

7-5 Calibrating Analog Input

Explains the calibration procedure for current and voltage analog inputs.

7-7 Checking Indication Accuracy

Describes how to verify the controller's indication accuracy after calibration.

Appendices

A-1 Specifications

Lists the detailed specifications and ratings of the digital temperature controllers.

A-4 Error Displays

Explains common error codes and their corresponding meanings and actions.

A-5 Troubleshooting

Offers solutions for common problems encountered during operation.

A-6 Parameter Operation Lists

Provides comprehensive lists of parameters within different setting levels.

A-8 Setting Levels Diagram

Illustrates the navigation path between different setting levels.

A-9 Parameter Flow

Shows the flow and relationships between various parameters.

Index

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