The **E5AZ-R3HML** is a digital temperature controller from Omron’s E5AZ series. This specific model is designed for industrial process control, featuring high-speed sampling and a variety of input/output configurations. ### 1. Key Technical Specifications The model name "E5AZ-R3HML" provides specific details about its electronic capabilities: | Component | Specification | Description | |:---|:---|:---| | **Control Output** | Relay Output | SPST-NO, 250 VAC, 3 A (resistive load) | | **Input Type** | Multi-input | Supports Thermocouples, Platinum Resistance Thermometers, or Analog (V/mV/mA) | | **Alarms** | 3 Points | Provides three independent alarm relay outputs | | **Heater Burnout** | HB Feature | Includes Heater Burnout detection (requires a Current Transformer) | | **Voltage Supply** | 100 to 240 VAC | Wide range AC power supply input | | **Size** | 1/8 DIN | 48 x 96 mm front panel dimensions | --- ### 2. Core Electronic Features #### A. Multi-Input Sensor Support The internal circuitry includes a high-precision A/D converter that allows the controller to interface with various sensors without hardware changes. * **Thermocouples:** Types K, J, T, E, L, U, N, R, S, B, W, or PL II. * **RTDs:** Pt100 or JPt100. * **Analog:** 4 to 20 mA, 0 to 20 mA, 1 to 5 V, 0 to 5 V, or 0 to 10 V. #### B. PID Control with 2-PID Tuning The electronic "brain" uses an advanced 2-PID control algorithm. Unlike standard PID, this prevents overshoot when the setpoint (SP) changes while maintaining high-speed response to external disturbances. #### C. Heater Burnout Detection (HB) This model includes dedicated circuitry to monitor the current flowing to the heater. * It requires an external **Current Transformer (CT)**. * The electronics compare the measured current against a threshold; if the heater fails, the "HML" portion of the model indicates it can trigger an alarm. #### D. Relay Output (R) The **"R"** in the model name signifies a mechanical relay output. * **Pros:** Electrically isolated and capable of switching AC loads directly (up to 3A). * **Cons:** Limited mechanical lifespan compared to SSR (Solid State Relay) drivers; not suitable for very high-frequency switching. --- ### 3. Connection Terminal Map (Electronic Interface) ```text [ Power Supply ] --- Pins 1 & 2 (100-240 VAC) [ Relay Output ] --- Pins 3 & 4 (Control Load) [ Alarm Output ] --- Pins 5, 6, 7, 8 (Auxiliary Alarms) [ Input Sensor ] --- Pins 10, 11, 12 (TC/RTD/Analog Input) [ CT Input ] --- Pins 14 & 15 (Heater Burnout Detection) ``` --- ### 4. Safety and Protection * **Non-volatile memory:** Uses EEPROM to store parameters so settings are not lost during power failures. * **Isolation:** High dielectric strength between power terminals and I/O terminals to protect the internal logic from surges. ---