Atlas Copco 1626850005 Controller Panel (1626‑8500‑05)

The Atlas Copco 1626850005, also designated 1626‑8500‑05, is a complete controller panel engineered for Atlas Copco air compressors. This panel provides all the necessary control, monitoring, and protection functions for both stationary and portable compressor units. It features a user‑friendly operator interface, a powerful microcontroller for logic and regulation, and a comprehensive set of inputs and outputs to interface with sensors, actuators, and external systems. The panel is designed to ensure optimal compressor performance, energy efficiency, and operational safety.

Panel Design and Construction

The panel is housed in a sturdy sheet‑metal enclosure with a powder‑coated finish, rated to IP54 for protection against dust and water ingress. The front face includes a backlit LCD display with a resolution of 128x64 pixels, accompanied by a tactile membrane keypad with 16 keys for navigation and data entry. The display is readable in a wide range of ambient light conditions. Internal components are arranged on a modular backplane, simplifying wiring and maintenance. All terminal connections are clearly labelled and accessible after opening the front door.

Display and User Interface

The graphical LCD shows key operational parameters in real time: discharge pressure, air temperature, motor current, oil pressure (if applicable), and running hours. It also presents alarm messages, maintenance reminders, and historical event logs in plain text. The keypad enables operators to adjust pressure setpoints, change operating modes (auto/manual/remote), set timers for scheduled start/stop, and configure communication parameters. The interface supports multiple languages and can be customised via a configuration tool.

Technical Specifications

• Supply Voltage: 24 VDC (derived from internal transformer or external power supply)

• Digital Inputs: 8 isolated (24 VDC, sink/source selectable)

• Digital Outputs: 6 relay (2 A @ 250 VAC, 1 A @ 30 VDC)

• Analog Inputs: 4 channels (configurable for 0‑10 V, 4‑20 mA, or Pt100)

• Analog Outputs: 2 channels (0‑10 V, max 10 mA)

• Communication: RS‑485 Modbus RTU (standard), optional Ethernet module for Modbus TCP

• Display: Graphic LCD, 128x64, adjustable backlight

• Memory: 4 MB flash for firmware and 2 MB for data logging

• Operating Temperature: -10 °C to +55 °C

• Storage Temperature: -20 °C to +70 °C

• Protection: IP54 (front), IP20 (rear)

• Dimensions: 240 x 180 x 75 mm (W x H x D)

Control Logic and Regulation

The panel's microcontroller runs a real‑time executive that executes a comprehensive control algorithm. It manages load/unload cycles based on pressure feedback, implements soft‑start and soft‑stop of the motor, and controls solenoid valves for inlet and blow‑down. For multi‑compressor installations, the panel can act as a master or slave, coordinating the sequencing of up to 4 compressors to balance runtime and energy consumption. It also features a sleep mode that automatically stops the compressor during extended no‑demand periods and restarts when needed.

Protection and Safety Features

The controller panel includes extensive protection mechanisms to safeguard the compressor and its operator:

• High discharge temperature shutdown

• Low oil pressure alarm and shutdown (for oil‑flooded units)

• Motor overload protection (via external thermal relay or internal current monitoring)

• Phase loss and phase sequence detection

• Emergency stop input with immediate power cut

• Over‑pressure safety valve control (electronic monitoring)

• Sensor fault detection (open/short circuit) and fallback modes

All alarms are displayed with a clear message and can be acknowledged via the keypad. An alarm relay output is provided for remote signalling.

Data Logging and Maintenance Support

The panel logs a history of all alarms, events, and parameter changes, with a capacity of 1000 entries. It also stores daily averages of pressure, temperature, and motor load, enabling trend analysis for predictive maintenance. A maintenance scheduler can be programmed to alert the operator when service intervals (e.g., oil change, filter replacement) are due. The logs can be exported via the RS‑485 port to a PC using Atlas Copco’s service software.

Installation and Commissioning

The panel is designed for panel‑mounting in a control cabinet. It requires a cut‑out of 220 x 160 mm and is secured with four screws. Wiring connections are made to the terminal blocks on the rear; all inputs and outputs are clearly marked. Commissioning involves entering the compressor’s specific parameters (motor size, pressure transducer range, temperature sensor type) through a step‑by‑step wizard accessible via the keypad. A built‑in diagnostic test mode verifies each I/O channel and sensor before starting the compressor.

Compatibility

This controller panel is compatible with Atlas Copco GA, GA+, GR, and Z series compressors, as well as portable XA and XR models. It can replace earlier 1900 series panels (such as 1900‑0700‑xx) with minimal rewiring, as it uses the same connector pin assignments. The panel’s firmware can be updated to support new compressor variants or additional features.

Communication and Remote Monitoring

Standard RS‑485 Modbus RTU allows connection to a building management system or remote telemetry unit. Optional Ethernet module (sold separately) provides Modbus TCP and enables web‑based monitoring via a built‑in web server. The panel can also be integrated with Atlas Copco’s SMARTLINK platform for cloud‑based performance analysis and alerting.

Reliability and Service Life

The panel uses automotive‑grade components and conformally coated circuit boards to resist humidity and corrosive gases. Mean time between failures is rated at over 100,000 hours at 40 °C. No internal batteries are used, eliminating periodic replacement. The keypad is rated for 1 million actuations, and the display backlight has a lifespan of 50,000 hours.

Applications

This controller is found in diverse industries: automotive manufacturing, mining, construction, food and beverage, pharmaceuticals, and general industrial plants. It ensures that compressed air systems run efficiently, safely, and with minimal downtime.

Benefits for End Users

Operators gain clear, immediate insight into system status, enabling proactive intervention. Energy‑saving features reduce power costs, while protection functions extend compressor life. The intuitive interface lowers operator training requirements, and the diagnostic capabilities speed up troubleshooting.

Conclusion

The Atlas Copco 1626850005 controller panel (1626‑8500‑05) is a robust, feature‑rich control solution that enhances the performance and reliability of Atlas Copco air compressors. Its comprehensive functionality, ease of use, and integration options make it an essential component for effective compressed air management.