GE SR469 469-P5-HI-A20-E | Motor Management Relay 5A CT Input In Stock

Description

Key Technical Specifications

Product Introduction

If you are running medium-voltage motors in a plant, you know that a simple overload trip isn’t enough to save a multi-million dollar asset from melting down. That is exactly why the GE SR469 469-P5-HI-A20-E became an industry standard. It isn’t just a trip relay; it is a full-blown motor management system that uses a dynamic thermal model to track the motor’s exact heat capacity in real-time. It factors in positive and negative sequence currents, RTD feedback, and even ambient conditions to predict failures before they happen.Field engineers trust this specific model (469-P5-HI-A20-E) because it is built for the harsh reality of industrial power grids. It handles a wide control power range (90-300V DC) and comes with a draw-out chassis, meaning you can swap the unit in minutes during an emergency without rewiring the whole panel. With four 4-20mA analog outputs and Modbus communication, it plays nicely with older DCS systems and modern SCADA setups alike.

Quality SOP & Tech Pitfalls (The Reality Check)

The Lab Report (SOP)
Every GE SR469 relay goes through a rigorous checkout before it ships. We start with a physical inspection of the draw-out chassis pins to ensure they aren’t bent (a common shipping issue). We then rack the unit into a test block and apply the 90-300V DC control power to verify the LCD boots up correctly. We simulate a 5A CT input to test the thermal overload curve accuracy and verify the trip contacts close as expected. Finally, we check the RS232/RS485 ports to ensure they are communicating properly before sealing it up.The Engineer’s Warning (Pitfalls)
Here is the number one headache with the SR469: The Thermal Model Settings. If you just slap this relay in and use the default settings, it will nuisance trip or, worse, fail to protect the motor. You must accurately input the motor’s Full Load Amps (FLA), Service Factor, and especially the “Cold vs. Hot Safe Stall Time.” I once saw a perfectly good compressor motor get wrecked because the technician ignored the RTD bias settings, causing the relay to underestimate the stator temperature. Also, always check the phase CT ratio—if your field CTs are 400:5 but the relay is set to 200:5, your protection logic is completely useless.

Installation & Configuration Guide

1. Pre-Installation Safety: Lock out and tag out the motor control center (MCC). Verify zero energy on the control power lines. ⚠️
2. Removal: If replacing an existing unit, carefully pull the handle to disengage the draw-out chassis. Take a photo of the rear terminal wiring and the current DIP switch/settings if applicable.
3. Installation: Inspect the backplane connector for debris. Slide the new 469-P5-HI-A20-E into the chassis until it seats firmly. Ensure the locking mechanism engages.
4. Wiring Check: Verify the 5A CT secondary wiring is tight and grounded at only one point to prevent ground loops. Double-check the control power polarity (90-300V DC).
5. Power-On & Programming: Apply control power. The LCD should light up. Immediately go into the S2 Setup pages to program the motor nameplate data (FLA, Voltage, CT Ratio) and communication settings (Modbus ID, Baud Rate).

Compatible Replacement Models

Frequently Asked Questions (FAQ)

What does the “P5” in the model number actually mean?
The “P5” specifically indicates that this relay is configured for a 5 Ampere Phase CT (Current Transformer) secondary input. If your plant uses 1A CTs, this unit will not read the current correctly without external interposing CTs.Can I use this relay on a low-voltage motor?
Technically yes, but it is overkill. The SR469 is optimized and priced for medium-voltage motor applications. If you are protecting a standard 480V motor, you are better off with a simpler relay like the GE 369 or 269 unless you specifically need the advanced thermal modeling and RTD inputs.How do I connect this to my computer for programming?
The front panel has a dedicated RS232 port. You will need a standard serial cable (often a null-modem cable) to connect it to a laptop running the GE Multilin EnerVista software. The default baud rate is usually 9600, but it can be programmed up to 19200.Does this unit support RTDs for bearing temperature?
Yes. The 469-P5-HI-A20-E supports up to 12 RTD inputs. You can configure these to monitor stator windings, bearings, or ambient temperature, and the relay will use this data to bias the thermal overload model for better accuracy.My relay is showing a “Loss of Load” alarm. What does that mean?
This isn’t necessarily a fault with the relay. “Loss of Load” means the motor is running, but the current draw is significantly lower than expected (like a pump running dry or a coupling shearing off). Check your mechanical equipment first before blaming the electronics.Is the draw-out chassis included with the relay?
Typically, yes. The SR469 is sold as a complete unit with the chassis. However, if you are buying just the “module” as a spare, verify that you already have a chassis installed in your panel. The module will not work without the backplane connector.