OMRON E5EC-QR2ASM-820 Controller

Desglose del código del modelo

E5EC QR 2 A S M 820

1. E5EC: Serie, DIN panel mount digital PID temperature controller, dimension 48 milímetros(h) × 96 milímetros(W.)
2. QR: Dual control outputs

q: OUT1 = Voltage pulse output (12 V CC., for SSR drive)

R: OUT2 = SPST relay contact output (1a)

✅ Supports Heating + Cooling dual control

3. 2: 2 auxiliary alarm outputs
4. A: Power supply AC 100～240 V (50/60 Hz)
5. S: Screw terminal block
6. METRO: Universal multi-input

Supports K/J/T/S/R/B/N thermocouples, Pt100/Pt1000 RTD, 4~20 mA / 0~10 V analog signal

7. 820: Function option code

Comunicación Modbus RS485 incorporada

No heater burnout detection (entrada CT), no external event input

Distinción:

800 = No communication; 820 = With RS485; 808/828 = With CT heater current detection

2. Key Electrical Specifications

3. Simplified Terminal Definition

1, 2: AC Power Input

3, 4: OUT1 SSR voltage drive output

5, 6: OUT2 Relay control output

7, 8 / 9, 10: Two groups of auxiliary alarm outputs

Sensor terminals: Universal connection for thermocouple / Pt100 RTD

4. Escenarios de aplicación típicos

Mold Temperature Controllers (TCU), Hot Air Ovens, Industrial Ovens, extruder heating & cooling control

Applications requiring SSR for heating + relay for cooling fan / cooling water valve

Automated production lines where PLC reads temperature and writes setpoint via RS485

5. Cross-Series Alternative Models

E5EC-QR2ASM-800: Sin comunicación RS485 (hardware identical otherwise)

E5EC-RR2ASM-820: Dual relay outputs, not suitable for high-frequency SSR control

E5EC-QX2ASM-820: Second output is 4~20 mA linear analog output

6. Selección & Precauciones de operación
7. QR configuration is ideal: SSR for heating, relay for cooling loads;
8. Relay output is NOT suitable for frequent switching (contact burnout risk); high-frequency loads must adopt Q voltage pulse output;
9. Do not reverse A/B polarity of RS485 wiring; terminate resistor can be installed on demand;
10. When enabling heating/cooling function, activate 2-PID heating-cooling control in parameters.

Practical Application Cases for OMRON E5EC-QR2ASM-820 Temperature Controller

Recap of core hardware strengths for this model:

✅ OUT1: DC12V voltage pulse output (drives SSR, suitable for high-frequency heating)

✅ OUT2: Relay contact output (drives fan / cooling water valve for cooling control)

✅ 2 independent alarm relay outputs

✅ Built-in RS485 Modbus-RTU (sufijo -820)

✅ Universal input: Pt100 RTD, K/J/T thermocouple, 4~20 mA analog signal

👉 Best fit: Calefacción & Cooling 2-PID control + PLC network communication

Caso 1: Injection Mold Temperature Controller (Most Common Industry Solution)

Working Requirements

Stable mold temperature 40～120°C; cooling water valve activates above set temperature, electric heater turns on below set temperature; PLC remotely reads process temperature & punto de ajuste; overtemperature alarm.

Hardware Layout

Sensor: Immersion Pt100 RTD

OUT1(q) → SSR Solid State Relay → Electric heating tube

OUT2(R) → Intermediate Relay → Cooling water solenoid valve (cooling circuit)

ALM1: Absolute high overtemperature alarm; ALM2: Sensor breakage alarm

RS485 connected to Siemens S7-1200 / Mitsubishi FX5U PLC

Critical Controller Parameter Settings

1. Modo de control: HEAT/COOL 2-PID
2. Action type: Heating Reverse Action, Cooling Direct Action
3. Enable AT auto-tuning to auto-calculate heating & cooling gain
4. Comunicación: Modbus RTU, 9600, 8, norte, 1

Project Benefits

Contactless SSR supports frequent cycling and extends heater service life; relay dedicated to cooling water valve; centralized collection of temperature data for multiple TCUs via PLC, production curve monitoring on HMI/SCADA.

Caso 2: Constant-Temperature Circulating Hot Air Oven / Food Baking Oven

Working Requirements

Temperature range 30～220°C; electric heating for temperature rise, exhaust fan activates for overheat ventilation; local panel operation + remote setpoint via HMI; audible & visual alarm when temperature exceeds limit.

Hardware Layout

Sensor: Type K Thermocouple

OUT1(q) → SSR → Heating elements

OUT2(R) → Relay → Heat exhaust fan

Dual alarms: High absolute limit alarm, deviation alarm

RS485 directly connected to Weinview / Kunlun Tongtai HMI (PLC not mandatory)

Operation Tips

Ovens feature large thermal inertia; appropriately increase derivative time parameter. Set cooling dead band to prevent frequent toggle between heater and exhaust fan.

Caso 3: Auxiliary Zone Temperature Control for Plastic Extruder Barrel

Working Requirements

Thermal holding of extruder barrel section; cooling water jacket enabled when temperature rises excessively; unified communication management via machine main PLC.

Hardware Layout

Type K thermocouple mounted on outer barrel surface

OUT1: SSR control for heating bands

OUT2: Cooling water solenoid valve

RS485 integrated into machine Modbus bus; PLC reads zone process temperatures

Selection Advantage vs RR model

E5EC-QR2ASM-820 outperforms RR type: Contactless SSR on heating channel supports 24/7 continuous production and avoids relay contact ablation.

Caso 4: Small High-Low Temperature Test Chamber / Thermostatic Water Bath

Working Requirements

Precise temperature control ±0.5°C; heating compensation at low temperature, refrigeration activated at high temperature; support simple programmable temperature ramp/soak profile.

Disposición

Immersion Pt100 RTD probe

OUT1 = Heating SSR; OUT2 = Refrigeration compressor / chilled water circulation pump

Built-in 2-PID heating-cooling balance suppresses minor temperature fluctuations.

Nota: Frequent compressor start-stop should be avoided; add start-stop delay logic in PLC program.

Caso 5: Lithium Battery Formation & Aging Thermostatic Cabinet (Nueva industria energética)

Working Requirements

Constant aging temperature 45°C; heater turns on when temperature drops, cooling fan activates for overheat; multiple controllers networked, MES system collects temperature data for traceability.

Arquitectura

Daisy-chain RS485 wiring for multiple E5EC units

PLC acts as Modbus master to poll PV(process value), SV(set value) and alarm status of each controller.

Two alarm outputs wired into safety circuit; overtemperature triggers overall equipment shutdown protection.

Caso 6: Small Rubber Curing Mold Heating Device

Working Requirements

Constant curing temperature 150~170°C; forced water cooling triggered on overtemperature; temperature adjustable locally, recipe parameters downloadable remotely.

Typical Fault Prevention

Cooling channel uses relay output, not suitable for ultra-frequent switching. PID buffering mitigates temperature fluctuation to prevent rapid cycling of cooling water valve.

Universal Wiring Logic (Applicable to all above cases)

1. Fuente de alimentación: Terminal 1, 2 → AC100~240 V
2. OUT1 (3,4): SSR drive → Heating load
3. OUT2 (5,6): Relay output → Cooling valve / ventilador de refrigeración
4. 11(A), 12(B): RS485 communication wires
5. Sensor terminals: Wiring for Pt100 RTD / Thermocouple

Adecuado & Unsuitable Application Summary

✅ Recommended to select E5EC-QR2ASM-820

1. Systems requiring Heating + Cooling bidirectional control
2. High-frequency switching heating loads driven by SSR
3. RS485 Modbus communication required with PLC/HMI
4. Demand for two independent alarm outputs

❌ Not recommended for this model

1. Only heating function required, no cooling (choose E5EC-QX2ASM-800 for cost saving)
2. Continuous 4~20 mA analog output required (select QX series)
3. Heater burnout detection via CT current transformer required (choose suffix -828 modelos)