GE 239-RTD-AN Digital I/O Module

Product Detailed Description

• Core Functionality: The primary function of the 239-RTD-AN is to protect AC motors from various damaging conditions, extending their lifespan and ensuring operational continuity. It continuously monitors critical motor parameters and takes protective actions (tripping the breaker, issuing alarms) when abnormal conditions are detected.

• Protection Features: It offers a wide array of protection functions, including but not limited to:

• Thermal Overload Protection: Utilizes thermal modeling to accurately calculate the motor's thermal capacity, protecting against overheating due to sustained overcurrents.

• RTD Temperature Monitoring: Connects to up to 3 RTDs (Pt, Ni, Cu types are programmable) to directly monitor stator and bearing temperatures, providing early warning and trip based on overtemperature.

• Phase Short Circuit Protection: Detects and trips on phase-to-phase short circuits.

• Ground Fault Protection: Detects earth/ground faults, which can lead to severe damage or safety hazards.

• Locked Rotor Protection: Protects the motor from damage if the rotor is stalled while power is applied.

• Undercurrent Protection: Can be used to detect conditions like pump dry run or loss of load (e.g., broken belt on a conveyor).

• Unbalance/Single-Phasing Protection: Detects phase current unbalance or loss of a phase, which can cause severe motor overheating.

• Breaker Failure Protection: Monitors the associated circuit breaker to ensure it trips correctly after a fault.

• Motor Start Supervision: Features like "Time Between Starts" and "Starts per Hour" protect the motor from excessive starting cycles.

• Monitoring and Diagnostics:

• Features a 40-character backlit LCD display for viewing status messages, fault conditions, measured values (current, temperature), and setpoints.

• Six LED status indicators provide quick visual feedback.

• Stores records of the last five trips, including cause and associated electrical/thermal data, aiding in fault diagnosis.

• Includes a dust-tight, splash-proof keypad for configuration, often protected by a cover.

• Communication: Equipped with an RS485 serial port, supporting Modbus RTU protocol for remote communication with SCADA systems, PLCs, or other control devices.

• Output Capabilities:

• Multiple trip/alarm/auxiliary/service outputs (relay contacts) for signaling and control.

• A single, isolated analog output (programmable to represent thermal capacity, % full load, or phase current) for continuous monitoring by external systems.

• Design: Compact in size, allowing it to fit into most motor starters and control panels. UL and CSA approved. Optional conformal coating for harsh environments.

Product Parameters

(Note: Specific values may vary slightly based on the exact firmware revision and manufacturing date. Always refer to the official GE Multilin 239 series manual, typically GEK-106613C or 1601-0067-DC, for definitive specifications.)

• Input Power Supply: Typically 70-265 VAC or 90-300 VDC (auto-sensing).

• Current Inputs: Designed for use with Current Transformers (CTs) with 1A or 5A secondary ratings.

• RTD Inputs: 3 programmable RTD inputs.

• Supported RTD Types: Pt (Platinum), Ni (Nickel), Cu (Copper).

• Lead Resistance Compensation: 3-wire (for RTDs).

• Temperature Range (Alarm/Trip): ~0 to 200 °C.

• Accuracy: ±2 °C.

• Analog Output:

• Type: Isolated, single analog output.

• Programmable for: Thermal Capacity (%), Full Load (%), Phase Current (A).

• Digital Outputs (Relay Contacts): Multiple configurable relay outputs (trip, alarm, auxiliary, service).

• Communication Port: RS485 (Modbus RTU).

• Display: 40-character backlit LCD.

• Operating Temperature Range: -10 °C to +60 °C (14 °F to 140 °F).

• Storage Temperature Range: -40 °C to +70 °C (-40 °F to +158 °F).

• Humidity: 95%, non-condensing.

• Insulation Voltage: 300 V.

• Fuse Rating: 5 x 20 mm, 250 V, 2.5 A.

• Mounting: Panel mount, typically with eight #6 self-tapping screws.

• Dimensions (approx.): 11.2cm (H) x 6.5cm (W) x 11cm (D) or 330 mm x 243 mm x 64 mm (varies based on specific packaging/version).

• Weight (approx.): 0.7 kg (1.5 lbs) to 2.3 kg (5 lbs) depending on packaging.

• Certifications: UL and CSA approved, ISO9001 manufactured.

Product Advantages

• Comprehensive Motor Protection: Offers a wide range of protection functions against electrical and thermal faults, preventing costly motor damage and downtime.

• Direct Temperature Monitoring (RTD): The RTD inputs provide direct, accurate measurement of motor winding and bearing temperatures, allowing for more precise thermal protection and predictive maintenance.

• Enhanced Diagnostics: Detailed trip records and real-time display of parameters facilitate quick troubleshooting and fault analysis.

• Analog Output for SCADA/DCS: The isolated analog output allows for continuous monitoring of critical motor health parameters by higher-level control systems.

• Compact Design: Its small footprint makes it easy to integrate into existing motor control centers (MCCs) and starter panels.

• Flexible and Programmable: Multiple setpoint groups and programmable outputs allow for adaptation to various motor types and application requirements.

• Harsh Environment Capability: Designed for industrial use, with optional conformal coating for added resilience in demanding conditions.

• Communication Capabilities: RS485 Modbus RTU enables easy integration into plant-wide automation systems for remote monitoring and control.

Precautions

• Correct Selection: Ensure the relay's current and voltage ratings, along with its protection features, are suitable for the specific 3-phase AC motor it will protect. Consider the number and type of RTDs required.

• Proper Installation: Follow the GE Multilin installation manual (GEK-106613C) strictly. Ensure correct wiring of CTs, RTDs, power supply, and control outputs. Proper grounding is essential.

• CT Sizing and Connections: Correctly size and connect the Current Transformers (CTs) to the relay's current inputs. Ensure no open circuits on the secondary of current transformers.

• RTD Wiring: Use appropriate shielded cables for RTDs to minimize noise, and ensure correct 3-wire compensation where applicable.

• Parameter Settings: Carefully configure all protection setpoints and operational parameters according to the motor's nameplate data and application requirements. Incorrect settings can lead to nuisance tripping or inadequate protection.

• Power Supply: Verify the power supply voltage is within the specified range (70-265 VAC or 90-300 VDC).

• Environmental Conditions: Install the relay within its specified operating temperature and humidity ranges. If applicable, ensure the "H" (conformal coating) option is selected for very harsh or humid environments.

• Safety: Always de-energize circuits before installation, wiring, or maintenance. Follow all local and national electrical safety codes.

• Firmware and Software: Utilize the appropriate EnerVista Setup software (version 2.7x or newer) for configuration and monitoring. Keep firmware updated if recommended by GE.

• Discontinued Status: Be aware that the 239 series has been largely discontinued by GE. While still available from surplus suppliers, consider long-term support and availability of spare parts. Newer alternatives like the Multilin 339, 859, 869, or P24 Agile relays are often recommended for new installations.

Product Applications

The GE Multilin 239-RTD-AN motor protection relay is widely used in various industrial sectors for protecting critical AC motors.

• Pumps: Protecting pumps in water/wastewater treatment, oil & gas, and process industries from overload, dry running (undercurrent), and bearing overheating.

• Fans/Blowers: Ensuring reliable operation of industrial fans and blowers by protecting against thermal overloads and bearing issues.

• Conveyors: Protecting conveyor motors from mechanical jams (locked rotor), overloads, and broken belts (undercurrent).

• Compressors: Monitoring and protecting large compressors against a range of electrical and thermal faults.

• Mills/Crushers: Providing robust protection in heavy industrial applications.

• HVAC Systems: Protecting large fan motors and compressor motors in commercial and industrial HVAC systems.

• General Industrial Drives: Any application involving 3-phase AC motors that require comprehensive protection and temperature monitoring.

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