VIVW MORE

Description

Technical Specifications

Brand

GE
Model

489‑P5‑LO‑A20‑E
Product Name

Generator Management Relay
Place of Origin

Canada
Customs HS Code

85362000
Power Supply

20‑60 VDC
Dimensions

229 mm × 254 mm × 254 mm
Weight

8.6 kg
Operating Temperature

‑20 °C to +60 °C
Storage Temperature

‑40 °C to +85 °C
Warranty

1year
Product Status

new and original

GE 489-P5-LO-A20-E

Inputs

Analog Current Inputs: 5 A phase CT secondary inputs

Analog Voltage Inputs: Phase VT secondary up to 200 V AC, neutral VT 100 V AC

RTD Inputs: Up to 12 RTD inputs (100 Ω Pt, 100 Ω Ni, 120 Ω Ni, 10 Ω Cu) for temperature monitoring

Digital Inputs: 8 opto-isolated digital inputs, 24 V DC sinking type with 6 mA nominal operating current

Power Supply Input: 20-60 V DC or 20-48 V AC (48-62 Hz), for LO low-power variant

Outputs

Relay Outputs: 8 Form-C relay contacts, rated 5 A @ 250 V AC and 0.5 A @ 30 V DC, configurable for trip, alarm and control applications

Analog Outputs (A20 option): 4 programmable 4-20 mA analog outputs with ±1% full-scale accuracy, assignable to current, voltage, power, frequency and temperature signals

Communication Ports: Front-panel RS232 port, two isolated RS-485 ports, 10 Mbps 10Base-T Ethernet (RJ45)

Supported Communication Protocols

Modbus RTU, Modbus TCP/IP, DNP 3.0

Compatible Software

GE Vernova EnerVista 489 Setup Software: Supports device configuration, metering data viewing, COMTRADE oscillography analysis, and sequence-of-events log review.

Interoperable with third-party SCADA and DCS systems via the above-mentioned communication protocols.

Compatible Operating Systems & Host Systems

PC host: Windows XP, Windows 7, Windows 10 (32-bit / 64-bit) for running EnerVista software.

Field integration: Generic DCS / SCADA platforms supporting Modbus RTU, Modbus TCP/IP or DNP 3.0; compatible with GE Multilin SR-series protection devices.

Commissioning Procedure for GE 489-P5-LO-A20-E

Safety Notes:

All high-voltage wiring must be completed with power removed.

Use a secondary injection test set to verify relay functions.

Do NOT apply primary high voltage to the relay during commissioning.

1. Pre-Power Inspection

Verify mechanical mounting, ventilation, and cabinet grounding.

Confirm wiring per schematic:

Power supply: LO model 20-60 VDC / 20-48 VAC, polarity and insulation.

CT secondary: shorted before power-on; ratio and polarity verified.

VT secondary: voltage range correct; no short circuit.

RTD wiring: 2-wire / 3-wire / 4-wire connections.

Digital inputs (24 VDC sinking) and relay outputs (trip/alarm).

4-20 mA analog outputs (A20 option) and communications: RS232, isolated RS-485, Ethernet RJ45.

Ensure all terminals are tight; no shorts or loose connections.

2. Power Up & Self-Test

Apply auxiliary power only; keep CT/VT primary de-energized.

Observe front panel LEDs; confirm successful self-diagnosis with no hardware faults.

Record firmware version and model identification.

3. Connect to EnerVista 489 Setup Software

Connect PC via front RS232, rear RS-485 (with F485 converter), or 10Base-T Ethernet.

Open EnerVista 489 Setup, add device, and configure communication settings: baud rate, address, IP.

Establish online connection, read existing setpoints, and save the original configuration as backup.

4. Basic System Configuration

Set parameters per motor/generator nameplate and project requirements:

System: CT primary/secondary, VT ratio, nominal frequency.

RTD channels: type (Pt100, Ni100, Ni120, Cu10) and assigned functions.

Digital inputs: mapping to breaker status, remote trip, external alarms, etc.

Relay outputs: assign 8 Form-C contacts to trip, alarm, and control logic.

Analog outputs (A20): assign 4-20 mA sources (current, voltage, power, temperature) and full-scale ranges.

Communications: Modbus RTU/TCP, DNP3.0 addressing, baud rate, IP, subnet, gateway.

Protection settings: thermal overload, overcurrent, over/undervoltage, loss of field, negative sequence, earth fault, start-up protection. Enter thermal model: FLC, cold/hot ratio, allowed starts.

Logic: interlocks, breaker control, alarm schemes.

Write settings to the relay, verify values, and save the commissioning file.

5. Static I/O Testing (Secondary Injection Recommended)

Digital Inputs: Activate each input; confirm status updates on the HMI and software.

Relay Outputs: Use software force commands (safe offline mode) to operate each output; verify contact action and indication.

Analog Inputs: Inject simulated CT/VT signals; compare measured values. Simulate RTD resistance; validate temperature accuracy.

Analog Outputs (A20): Verify 4-20 mA outputs with a multimeter; confirm ±1% FS accuracy.

Protection Elements: Inject test signals to trigger each function; verify pickup, operating time, trip/alarm outputs, LEDs, event logs, and COMTRADE records.

6. Communication Testing

Test Modbus RTU/TCP: read measurements, statuses, and events; confirm stability and data integrity.

Test DNP3.0 (if used): verify point mapping and event reporting.

Confirm DI/DO status, analog values, and alarms upload correctly to DCS/SCADA.

7. On-Site Live Verification (Primary Energized)

Perform only after all static tests pass and following site safety procedures.

Energize primary equipment; verify real-time current, voltage, power, frequency, and temperature.

Confirm alarms, event logs, and thermal model status.

Validate breaker position feedback and remote interlock logic.

Check 4-20 mA analog outputs to DCS under actual operating conditions.

8. Final Backup & Documentation

Save final setpoints, event logs, and COMTRADE files.