Harris Stellar Dynamics 8800-00002-02 PLC Power Control Center (135890)

The Harris Stellar Dynamics 8800-00002-02 is a PLC‑based power control center designed for broadcast transmission systems. Part of the Harris Stellar Dynamics product line, this unit provides remote monitoring and control of high‑power RF amplifiers, cooling systems, and auxiliary equipment. It integrates a programmable logic controller (typically a custom Harris module) with power contactors, circuit breakers, and communication interfaces. The unit is used in AM/FM radio transmitters and television transposers to manage power distribution and fault handling. The secondary part number 135890 may refer to a specific configuration or revision.

Functional Description

The 8800-00002-02 monitors mains voltage, phase currents, and heat exchanger status. It controls the sequencing of high‑voltage contactors for transmitter power supplies, ensuring proper warm‑up and cool‑down cycles. The PLC executes safety interlocks (door switches, flow switches, temperature sensors) and provides alarm outputs (relays) to remote control systems. The unit typically communicates via RS‑232 or RS‑485 using a serial protocol (e.g., Modbus RTU or Harris proprietary).

Technical Features

• Input Power: 208/240V AC, 3‑phase, 60 Hz

• Control Voltage: 24V DC (internal PLC) and 120V AC (for contactors)

• PLC Type: Harris‑branded or Allen‑Bradley MicroLogix (specific variant)

• Digital Inputs: 16 opto‑isolated, 24V DC

• Digital Outputs: 16 relay outputs, 2A at 250V AC

• Analog Inputs: 4 channels (0‑10V or 4‑20mA) for temperature and pressure

• Communication: RS‑232 and RS‑485 ports

• User Interface: Membrane keypad with LCD display (on front panel)

• Protection: Overcurrent, overvoltage, phase loss, undervoltage

• Dimensions: 19‑inch rack mount, 4U height (178 mm)

Applications

This unit is used in broadcast studios and transmitter sites to manage power to solid‑state RF amplifiers. It can also be found in industrial radar and high‑power RF heating systems. The 8800-00002-02 is a spare part for legacy Harris equipment and may be replaced by newer models in modern installations.

Maintenance and Diagnostics

Periodic inspection of contactors and cooling fans is recommended. The PLC program can be backed up using a programming terminal. Diagnostic LEDs on the front panel indicate power, CPU run, and fault conditions. The unit stores the last 50 alarm events with timestamps.

Conclusion

The Harris Stellar Dynamics 8800-00002-02 power control center provides reliable, automated power management for broadcast transmission systems, ensuring safe operation of high‑power RF equipment.