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Description
The General Electric Multilin 489-P5-HI-A20-E is a microprocessor-based generator management relay engineered for the comprehensive protection, control, and monitoring of small to medium-sized generators. As a key component of the SR family, it provides advanced features such as generator stator differential protection and detailed diagnostic logging to minimize troubleshooting time. This unit features a draw-out construction, allowing for efficient maintenance and reduced system downtime.
Features
- Comprehensive generator protection including stator differential, reverse power, overexcitation, and inadvertent energization.
- Enhanced display unit for improved local monitoring and setpoint management.
- Supports RTD and analog inputs for monitoring critical parameters like bearing temperature and vibration.
- Integrated waveform capture, event recording, and data logging capabilities.
- Communication support via RS232, RS485, and Modbus protocols.
- Built-in waveform simulation tools for setpoint verification.
Applications
- Primary and backup protection for industrial power generation systems.
- Synchronization and protection management in cogeneration plants.
- Critical monitoring for high-demand industrial power environments.
- Stator and bearing temperature monitoring for generator health diagnostics.
Technical Specifications
| Model |
SR489-CASE 489-P5-HI-A20-E |
| Manufacturer |
General Electric (GE Multilin) |
| Phase Current Inputs |
5 Amp |
| Control Power |
90-300 VDC / 70-265 VAC (48-62 Hz) |
| Analog Outputs |
4-20 mA |
| EFT Standard |
IEEE/ANSI C37.90.1 |
| Impulse Voltage Withstand |
5 kV |
| 3rd Harmonic Timing Accuracy |
+/- 3.0 s |
Installation Guidelines
- Ensure the device is installed in a clean, dry environment protected from excessive vibration and extreme temperatures.
- Verify that the control power supply matches the 90-300 VDC or 70-265 VAC rating before energizing.
- Use shielded communication cables for RS485 connections to minimize EMI interference.
- The unit utilizes a draw-out design; ensure the chassis is properly seated and locked to maintain electrical continuity.
- Always power down the system before inserting or removing the relay module from the rack to prevent electrical arcing or damage to internal components.
- Follow standard ESD (Electrostatic Discharge) precautions when handling the module internals.
FAQs
What is the 489-P5-HI-A20-E?
The GE Multilin 489-P5-HI-A20-E is a microprocessor-based generator management relay designed for protecting, controlling, and monitoring small to medium-sized generators.
What is the function of the 489-P5-HI-A20-E?
It offers complete generator protection, including stator thermal protection, bearing over-temperature monitoring, and negative sequence overcurrent for rotor protection.
How do I view metered values?
Metered values (voltage, current, power) are available on the front panel display or via communication ports.
Does the relay support 4-wire RS485?
No, the 489-P5-HI-A20-E communicates only in 2-wire half-duplex mode.
What are the analog output ranges?
The analog outputs are 4 to 20 mA.
