Sabroe UNISAB III 4209-001 Main Control Unit

Product Brief Description

The Sabroe UNISAB III 4209-001 is the core main controller unit (MCU) for Johnson Controls Sabroe industrial refrigeration compressors. It works paired with the 4214-001 HMI display panel, executing compressor sequence logic, safety protection, sensor data acquisition and bus communication for screw and reciprocating refrigeration compressors. It serves as a spare replacement part for UNISAB III control systems in ammonia and CO₂ refrigeration plants.

Product Features

• Main processing board for UNISAB III system, paired with 4214-001 operator display
• Built-in multi-channel analog and digital I/O for pressure, temperature, oil level and motor status monitoring
• CAN bus internal communication between main unit and local HMI panel
• Modbus RTU / TCP communication interface for SCADA and BMS integration
• Full safety interlock logic: high discharge pressure, low suction pressure, oil temperature, oil pressure and motor overload protection
• Onboard fault logging, event history and compressor runtime data storage
• 24V AC/DC power supply input, designed for refrigeration machine room environments
• Supports Sabroe SMC, SAB and CMO series screw and reciprocating compressors
• Separated HMI and main controller design, convenient for maintenance and part replacement

Application Scenarios

• Industrial ammonia and CO₂ refrigeration systems with Sabroe screw compressors
• Cold storage, food freezing plants, beverage and chemical process refrigeration stations
• Marine refrigeration and offshore platform cooling compressor packages
• Integration with plant SCADA, BMS and remote asset monitoring platforms
• Retrofit and spare replacement for existing UNISAB III control systems
• Large logistics low-temperature warehouses and industrial process cooling facilities

FAQ

Q1: What is the difference between 4209-001 and 4214-001?

A1: 4209-001 is the main control CPU unit; 4214-001 is the HMI display panel, they must work together as a set.

Q2: Can 4209-001 work without the 4214-001 display?

A2: The compressor can run with pre-configured program, but local parameter setup and readout require the 4214-001 HMI.

Q3: What communication protocols does it support?

A3: Internal CAN bus for HMI, Modbus RTU and Modbus TCP for upper control systems.

Q4: Which compressor models are compatible?

A4: It is designed for Sabroe SMC, SAB and CMO series screw and reciprocating refrigeration compressors.

Q5: Can it replace UNISAB II controller directly?

A5: No, UNISAB II and UNISAB III have different hardware architecture and program logic, whole system upgrade is needed.