Eliwell Sb655 C - Manual

| Alarm Code | Meaning | Likely Cause & Solution | | :--- | :--- | :--- | | | Internal EEPROM error | Faulty controller; replace unit. | | E1 | Probe 1 faulty (open circuit) | Broken probe, loose wire at terminals 2/3, or wrong S1P setting. | | E2 | Probe 1 short circuit | Moisture in probe tip, damaged probe, or short across terminals 2-3. | | HA | High temperature alarm | Temperature above ALU (alarm upper limit). Check compressor, refrigerant, fans. | | LA | Low temperature alarm | Temperature below ALL (alarm lower limit). Check setpoint, probe placement. | | PFA | Probe failure alarm – output forced | Controller is running a timed cycle because E1/E2 is active. Check probe wiring. |

This article serves as a complete digital handbook. We will cover everything from the technical specifications and terminal functions to step-by-step programming, parameter lists, alarm codes, and common wiring diagrams. The Eliwell SB655 C is a microprocessor-based digital temperature controller with an onboard relay output. It is part of Eliwell’s “Easy” series, known for its simplicity and robustness. The device is typically panel-mounted and features a bright 3-digit LED display, four buttons for navigation, and a user-friendly interface. eliwell sb655 c manual

A: ELIWELL NTC 10kΩ at 25°C (probe type: NTC103AT) is standard. PTC probes (PtC) are also supported if you change parameter S1P to “PtC.” Do not use PT100 (RTD) probes; they are incompatible. 10. Conclusion The Eliwell SB655 C is a workhorse of the refrigeration industry. Whether you are building a new cold room or repairing a frozen display case, understanding its manual is key to a long, trouble-free service life. | Alarm Code | Meaning | Likely Cause

| Terminal | Label | Function | Typical Connection | | :--- | :--- | :--- | :--- | | 1 | 12V | +12 Vdc output for probe (power supply) | Connect to probe + | | 2 | GND | Ground reference for probe | Connect to probe - | | 3 | PTC/NTC | Analog input for temperature probe (Probe 1) | Signal wire (typically white or yellow) | | 4 | N | Neutral (Power supply input) | 230V Neutral Line | | 5 | L | Live (Power supply input) | 230V Live Line | | 6 | NO | Normally Open output relay contact | Compressor contactor coil (L1) | | 7 | COM | Common output relay contact | Compressor contactor common | | 8 | NC | Normally Closed (rarely used) | Alarm circuit or unused | | | HA | High temperature alarm |