SABROE UNISAB II Panel

SABROE UNISAB II Compressor Control Panel (Fully Tested & Inspected)

The SABROE UNISAB II is a control and surveillance panel engineered to automate and protect industrial and marine refrigeration compressors. Designed for heavy-duty marine duty cycles, the UNISAB II executes precise capacity control, process limit monitoring (suction/discharge pressures, oil differential, and motor current), and automated safety shutdown sequences.

Every UNISAB II panel supplied undergoes rigorous multi-stage bench and signal testing by marine electronics engineers. All digital inputs, relay outputs, RTD PT100 temperature channels, 4–20 mA transducer loops, communication buses, and the backlit alphanumeric display are fully verified under simulated operating loads to guarantee immediate drop-in functionality aboard ocean-going vessels, offshore rigs, and industrial cooling plants.

Model Details

• Manufacturer: SABROE Refrigeration / Johnson Controls (originally developed with Lanng & Stelman A/S)
• Model Name: UNISAB II Control and Regulating System
• Controller Type: Standalone / Multi-unit Chiller & Compressor Controller
• Display Interface: 4-line x 20-character backlit LCD with membrane push-button keypad
• Hardware Architecture: Modular backplane system with integrated power supply module, CPU/display board, and high-isolation terminal connection blocks

Manufacturer Part Numbers & Cross-References

• Primary System MPN: UNISAB II (Standard Panel Assembly)
• Internal / Board Level Numbers: 1606-002, 1606-001, 1606-003 Series
• Associated Sabroe Engineering Documentation:
  • 0178-511-ENG (UNISAB II Ver 202.04 Engineering Manual)
  • 0178-449-ENG (UNISAB II Instruction & Operating Manual)
  • 0178-445-ENG (UNISAB II Engineering Manual)
• Sub-Assembly References: Lanng & Stelman 1606 series power & CPU PCBs

Features

1. Comprehensive Engine Room Surveillance: Automatically tracks suction, discharge, and intermediate pressures alongside multiple temperature points to maintain safe operational envelopes.
2. Dynamic Capacity & Slide Control: Manages step-unloading on piston units or high-resolution hydraulic slide positioning on screw compressors for optimal COP and reduced power draw.
3. Built-In Compressor Safeguards: Features pre-programmed interlocks for low oil differential pressure, high discharge pressure, motor overload, and superheat warnings.
4. Multisab Multi-Compressor Coordination: Capable of interconnecting up to 14 compressors via RS-485 network to balance running hours and automate plant staging.
5. Ruggedized Maritime Construction: Purpose-built to endure continuous engine room vibration, electromagnetic interference from main switchboards, and marine ambient temperatures.

Applications

• Marine cargo refrigeration plants (Reefer vessels, LPG/LEG reliquefaction systems)
• Shipboard provision refrigeration and air conditioning (HVAC) systems
• Offshore platform process cooling and chiller packages
• Industrial cold storage facilities, abattoirs, and blast freezing tunnels
• Food and beverage production and process chilling plants

Frequently Asked Question

Can I replace an existing UNISAB II with this unit without rewiring my compressor skid?

Yes. As long as your existing installation uses a standard UNISAB II panel, this unit is a direct form, fit, and functional replacement. Simply match your terminal plugs, set the correct supply voltage selector plug, and enter your compressor parameters via the keypad menu.

How do I configure the panel for a reciprocating compressor versus a screw compressor?

The UNISAB II firmware supports both configurations. During setup in the Engineering/Configuration menu, selecting the compressor model (e.g., SMC or SAB) automatically configures the software logic to handle either reciprocating unloader solenoid steps or hydraulic slide valve control.

What causes a “Motor Guard Error” or “Compr. Motor Error” on startup?

This fault typically indicates that the safety chain loop (emergency stop circuit or external motor protection relay) is open. Inspect the high-pressure mechanical cutout, motor thermal protection relay, and manual emergency stop push-buttons to confirm continuity across the safety loop before resetting the alarm.

Does the panel retain programmed parameters if main power is lost?

Yes. Configuration parameters, calibration offsets, and alarm history are retained in non-volatile memory on the CPU board, preventing parameter loss during vessel blackouts or seasonal shutdowns.

How is the panel tested prior to shipping?

Each unit is connected to our dedicated workshop test bench where power rails are monitored for ripple, input loops receive calibrated mA/resistance signals, output relays are checked under load, and the display and keypad are cycled to verify total responsiveness. A certified bench test checklist accompanies the panel.