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- SR489-CASE 469-P5-HI-A20-E
- Generator Management Relay
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- 252 × 216 × 224 mm
- 7.7 kg
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Product Overview
The GE SR489-CASE 469-P5-HI-A20-E is associated with the GE Multilin 469 Motor Management Relay platform. The 469 monitors medium- and large-motor operating conditions, evaluates configured protection elements, and coordinates protective actions through assigned output relays. It is used in motor control and protection panels where electrical measurements, thermal supervision and fault diagnostics are required.
This configuration combines 5 A phase current transformer inputs, high-range auxiliary power, four 4–20 mA analog outputs and an enhanced display. The P5 option is intended for phase CT secondary circuits rated at 5 A. The HI option accepts a high-range AC or DC auxiliary supply, while A20 identifies the 4–20 mA analog output configuration. The E option adds a larger LCD and enhanced local keypad interface.
In a motor protection installation, the relay can evaluate current, voltage, thermal and other configured operating signals. Its protection functions include motor overload and overtemperature protection, current imbalance monitoring, and additional configurable electrical and mechanical protection functions. Event records, metering and diagnostic information support fault investigation and maintenance planning.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE |
| Model / Order Number | SR489-CASE 469-P5-HI-A20-E |
| Product Family | GE Multilin 469 |
| Product Type | Motor Management Relay |
| Phase CT Input Option | P5 |
| Phase CT Secondary Rating | 5 A |
| Control Power Option | HI |
| DC Control Power Input | 90–300 V DC |
| AC Control Power Input | 70–265 V AC |
| AC Control Power Frequency | 48–62 Hz |
| Analog Output Option | A20 |
| Analog Output Range | 4–20 mA |
| Analog Output Channels | 4 |
| Display Option | E — Enhanced display with larger LCD |
| Temperature Monitoring | Supports up to 12 RTD inputs |
| Communication Interfaces | RS232 and RS485 |
| Communication Protocols | Modbus RTU, DNP 3.0 |
| Protection Functions | Motor overload, overtemperature, current imbalance and other configurable protection functions |
| Construction | Drawout relay and case arrangement |
| Dimensions | 252 × 216 × 224 mm |
| Weight | 7.7 kg |
Product Features
- 5 A phase CT inputs: Matches motor protection installations using current transformers with 5 A secondary circuits.
- High-range auxiliary power: Supports AC or DC control supplies within the HI option’s specified input range.
- Four analog output channels: Provides 4–20 mA signals for transmitting selected measurements to compatible monitoring equipment.
- Enhanced operator display: Offers a larger LCD and improved keypad for viewing relay information and accessing settings.
- Motor thermal protection: Uses the configured thermal model and associated measurements to evaluate motor heating conditions.
- RTD temperature monitoring: Supports temperature monitoring through connected RTD sensors for configured motor locations.
- Current imbalance protection: Helps detect abnormal phase-current distribution that may affect motor operation.
- Electrical metering: Provides operating measurements for monitoring motor loading and electrical conditions.
- Event and diagnostic records: Assists maintenance personnel in identifying the protection element associated with a trip and reviewing preceding conditions.
- Serial communications: Supports integration with compatible control and monitoring systems through supported communication interfaces.
Working Principle
The 469 receives phase-current signals from connected current transformers and voltage signals from voltage transformers. It processes these measurements and evaluates them against the motor ratings, configuration parameters and protection settings entered during commissioning. For the P5 configuration, the phase CT secondary circuits must be rated at 5 A, and the programmed CT ratios must match the installed instrumentation.
The relay’s thermal model estimates motor heating using the configured operating data and measured current. Depending on the enabled functions, the relay can also monitor current imbalance, electrical faults, temperature inputs and other abnormal conditions. When a protection element meets its operating criteria, the relay activates the assigned output to initiate a trip or alarm through the motor control circuit.
The A20 option provides four 4–20 mA analog output channels. These can be assigned to supported measurements so that a PLC, recorder or monitoring device can display selected motor operating values. The E option improves local access to relay information through its larger display and keypad.
Correct motor nameplate data, CT and VT ratios, thermal settings, trip assignments and auxiliary supply connections are essential to protection performance. Commissioning tests should verify both the relay’s internal settings and its response through the complete motor trip circuit.
Role in a Motor Protection and Control Architecture
The GE Multilin 469 serves as the local motor protection and monitoring device between electrical measurement circuits, temperature sensors, motor starter or breaker controls, and the plant supervisory system. It evaluates the connected signals and operates configured outputs when the programmed protection logic requires action.
| System Component | Function | Relationship to the Relay |
|---|---|---|
| Phase Current Transformers | Measure motor phase currents | Supply 5 A secondary signals matching the P5 configuration |
| Voltage Transformers | Provide motor supply voltage measurements | Supply voltage signals for enabled protection and metering functions |
| RTD Temperature Sensors | Measure motor temperatures | Provide thermal information for configured monitoring and protection |
| Motor Contactor or Circuit Breaker | Connects or isolates the motor | Responds to the assigned trip output through the control circuit |
| Motor Starter Control Circuit | Coordinates starting and stopping | Interfaces with configured relay outputs and external control logic |
| 4–20 mA Receiving Device | Displays or records operating measurements | Receives selected signals from the A20 analog outputs |
| Plant PLC or SCADA System | Supervises motor operation | Uses supported communication data or external analog signals |
| Auxiliary Control Power Supply | Powers the relay | Must meet the HI option’s AC or DC input requirements |
| Engineering Computer | Supports setup and diagnostic review | Connects through a supported interface and compatible software |
Industrial Applications
| Application | Operating Requirement | Role of the Relay |
|---|---|---|
| Industrial Pump Motors | Monitor motor loading and abnormal electrical conditions | Applies configured motor protection and thermal monitoring |
| Compressor Drive Motors | Supervise motor current, thermal condition and fault status | Coordinates configured protection responses with the motor control circuit |
| Fan and Blower Motors | Detect overload and phase-current abnormalities | Monitors electrical conditions and operates assigned trip outputs |
| Conveyor Drive Motors | Protect motors under changing mechanical loads | Evaluates configured overload and other protection elements |
| Process Plant Motors | Integrate motor protection with plant monitoring | Supplies operating measurements, status and diagnostic information |
| Large Industrial Motor Control Centers | Centralize protection for critical motor circuits | Connects measurement inputs, trip outputs and supervisory interfaces |
Installation and Maintenance
- Verify the complete order code: Confirm that the supplied unit matches the required P5 current input, HI control power, A20 analog outputs and E enhanced display configuration.
- Inspect the case and relay assembly: Check the case identification, terminals, connectors and drawout mechanism before installation.
- Confirm auxiliary power: Verify that the supply falls within 90–300 V DC or 70–265 V AC at 48–62 Hz.
- Check phase CT secondary ratings: Ensure the installed phase CTs provide 5 A secondary signals and that the programmed ratios match the motor installation.
- Verify phase assignment and polarity: Compare CT wiring with the motor protection drawings to prevent incorrect measurements or unintended protection operation.
- Review motor nameplate data: Confirm the motor’s rated current and other required nameplate values before configuring the thermal model and overload protection.
- Inspect voltage input wiring: Check voltage-transformer ratios, phase relationships and input connections for functions that use voltage measurements.
- Test analog output loops: Confirm that receiving equipment supports 4–20 mA signals and that channel assignments and scaling correspond to the selected measurements.
- Check RTD sensor circuits: Verify supported sensor types, terminal assignments and wiring for each configured motor temperature point.
- Validate trip and alarm assignments: Check output logic, contact ratings and the motor starter or breaker interface before returning the motor to service.
- Test communications and display operation: Verify the enhanced display, keypad and required serial interfaces during commissioning.
- Document the protection configuration: Record motor settings, CT and VT ratios, thermal parameters, output assignments, communication settings and test results for future maintenance.
Compatible System Components
| Component | Function | Compatibility Consideration |
|---|---|---|
| 5 A Phase Current Transformers | Supply motor phase-current measurements | Match the P5 input rating and configured CT ratios |
| Voltage Transformers | Provide voltage measurement signals | Verify secondary ratings, connection arrangement and programmed ratios |
| RTD Temperature Sensors | Measure motor temperature | Confirm sensor type and wiring against the configured RTD inputs |
| Motor Contactor or Circuit Breaker | Disconnects the motor after a trip command | Verify coil ratings and the complete trip-control circuit |
| Motor Starter Control Circuit | Coordinates motor control actions | Check the assigned relay outputs and interlocking logic |
| 4–20 mA Analog Input | Receives selected relay measurements | Match signal range and scaling to the configured output channels |
| RS485 Serial Network | Carries supported communication data | Configure compatible protocol, addressing and serial settings |
| Plant PLC or SCADA System | Displays motor status and operating data | Verify supported data mapping and communication configuration |
| Engineering Computer | Provides access to setup and diagnostics | Use compatible setup software and a supported connection method |
Recommended Related Models
| Model | Product Type | Relationship | Selection Consideration |
|---|---|---|---|
| GE Multilin 469-P5-HI-A20 | Motor Management Relay | Same phase CT, control power and analog-output options with the basic display | Consider when the enhanced display is not required |
| GE Multilin 469-P1-HI-A20-E | Motor Management Relay | Related configuration with 1 A phase CT inputs, HI power, A20 outputs and enhanced display | Select when the connected phase CT secondary rating is 1 A |
| GE Multilin 469-P5-LO-A20-E | Motor Management Relay | Related configuration with 5 A phase CT inputs and low-range control power | Compare the LO input range with the available auxiliary supply |
| GE Multilin 469-P5-HI-A1-E | Motor Management Relay | Related configuration with 5 A phase CT inputs and 0–1 mA analog outputs | Consider when the receiving equipment requires the A1 output range |
Key Advantages
- Matches motor protection installations using 5 A phase CT secondary circuits.
- Accepts high-range AC or DC auxiliary power.
- Provides four configurable 4–20 mA analog outputs for external monitoring.
- Combines motor thermal protection, electrical protection and metering.
- Supports RTD-based temperature monitoring for configured motor locations.
- Offers an enhanced local display and diagnostic information for maintenance work.
Technical FAQs
How does the P5 input configuration affect CT selection for the 469?
P5 specifies 5 A phase CT secondary inputs. The connected CT rating and programmed ratio must match the motor’s measurement circuit. Using an incorrect CT ratio can affect displayed current, thermal calculations and protection thresholds.
How should the thermal model be configured for a motor with frequent starts?
The thermal settings should reflect the motor’s nameplate data, starting characteristics and permitted thermal limits. Review the motor’s starting duty and configured overload parameters during commissioning, then validate the protection response using an approved test procedure.
When is it useful to connect RTD sensors to this relay?
RTD inputs provide direct temperature measurements from supported motor locations, such as stator windings or bearings when those sensors are installed. They can supplement current-based thermal estimation and help identify temperature conditions that warrant an alarm or trip.
What should be verified when integrating the A20 outputs with a plant PLC?
Confirm that the PLC analog input accepts 4–20 mA signals, then match the selected relay measurement to the intended input channel and engineering-unit scaling. Test the loop across its expected range and compare PLC readings with the relay’s local measurements.