1. Introduction
The GEYA GRV8-05 series is a sophisticated 3-phase voltage monitoring relay designed to protect equipment and personnel from various electrical anomalies. It provides comprehensive protection against overvoltage, undervoltage, phase asymmetry, phase sequence errors, and phase failure, incorporating an adjustable delay time function. This manual provides essential information for the safe and effective installation, operation, and maintenance of your GRV8-05 relay.
2. Safety Information
WARNING: Electrical shock hazard. Installation and servicing should only be performed by qualified personnel.
- Always disconnect power before installing or servicing the device.
- Ensure proper grounding according to local electrical codes.
- Verify all connections are secure before applying power.
- Do not operate the device if it appears damaged.
3. Product Variants
The GRV8-05 series offers different models based on voltage range and output contact configuration:
- GRV8-05 M460: 10A, 1SPDT output contact. Designed for 3-phase 3-wire systems with Phase-Phase (P-P) voltage range: 220V, 230V, 240V, 380V, 400V, 415V, 440V, 460VAC.
- GRV8-05 M265: 10A, 1SPDT output contact. Designed for 3-phase 4-wire systems with Phase-Neutral (P-N) voltage range: 127V, 132V, 138V, 220V, 230V, 240V, 254V, 265VAC.
- GRV8-05D M460: 8A, 2SPDT output contacts. Designed for 3-phase 3-wire systems with Phase-Phase (P-P) voltage range: 220V, 230V, 240V, 380V, 400V, 415V, 440V, 460VAC.
- GRV8-05D M265: 8A, 2SPDT output contacts. Designed for 3-phase 4-wire systems with Phase-Neutral (P-N) voltage range: 127V, 132V, 138V, 220V, 230V, 240V, 254V, 265VAC.
4. Setup and Installation
The GRV8-05 relay is designed for 1-MODULE DIN rail mounting.
4.1 Mounting
- Ensure the power supply is disconnected.
- Snap the relay onto a standard 35mm DIN rail.
4.2 Wiring
Refer to the specific wiring diagram for your model (3-wire or 4-wire system). Ensure all connections are tight and correct.
4.3 Initial Configuration
The device controls its own supply voltage using True RMS measurement. Set the rated operating voltage using the knob on the front panel. The GRV8-05 allows setting 8-level rated operating voltages.
5. Operation
The GRV8-05 relay provides protection functions including overvoltage, undervoltage, phase asymmetry, phase sequence, and phase failure, with an adjustable delay time.
5.1 Front Panel Controls and Indicators
The front panel typically features:
- Un Knob: To set the rated operating voltage.
- U> Knob: To set the overvoltage threshold (2% to 20% above Un).
- U< Knob: To set the undervoltage threshold (-20% to -2% below Un).
- Asy Knob: To set the phase asymmetry threshold (8%).
- Tt Knob: To set the delay time (0.1s to 10s).
- LED Un (Green): Indicates the status of the supply voltage.
- LED R (Red): Indicates the relay output status.
5.2 Function Diagrams
The relay operates based on the configured parameters. The following diagrams illustrate the behavior of the relay under different fault conditions:
- Phase Failure and Phase Sequence Function: The relay monitors the presence and correct sequence of all three phases. If a phase is lost or the sequence is incorrect, the relay will trip after the set delay time.
- Overvoltage and Undervoltage Function: The relay continuously monitors the voltage levels. If the voltage exceeds the upper threshold (U>) or drops below the lower threshold (U<) for the set delay time (To/Tu), the relay will trip.
- Asymmetry Function: The relay monitors the voltage balance between phases. If the asymmetry exceeds the set threshold (Asy) for the set delay time (Ta), the relay will trip.
6. Maintenance
The GEYA GRV8-05 Voltage Protection Relay is designed for long-term, maintenance-free operation under normal conditions. However, periodic checks are recommended:
- Visual Inspection: Regularly inspect the device for any signs of physical damage, discoloration, or loose connections.
- Terminal Tightness: Ensure all wiring terminals remain tight to prevent overheating or intermittent operation.
- Environmental Conditions: Verify that the operating environment remains within the specified temperature and humidity ranges.
- Cleaning: If necessary, gently clean the exterior of the device with a dry, soft cloth. Do not use solvents or abrasive cleaners.
7. Troubleshooting
If the relay is not functioning as expected, consider the following:
- No Power (LED Un Off): Check the main power supply to the relay. Ensure all phases are present and correctly connected.
- Relay Tripped (LED R Off, or flashing):
- Overvoltage/Undervoltage: Check the line voltage. Adjust U> or U< settings if necessary.
- Phase Asymmetry: Check the voltage balance across phases. Ensure loads are balanced. Adjust Asy setting if necessary.
- Phase Sequence/Failure: Verify the phase sequence is correct and all phases are present. Correct any wiring errors.
- Incorrect Delay Time: Check the Tt knob setting.
- Intermittent Operation: Inspect all wiring connections for looseness or corrosion.
If the issue persists after basic troubleshooting, contact qualified technical support.
8. Specifications
| Feature | Specification |
|---|---|
| Brand Name | GEYA |
| Model Number | GRV8-05 Voltage Relay |
| Theory | Voltage relay |
| Power Source | AC |
| Voltage (M460) | 220V-460VAC (Phase-Phase) |
| Voltage (M265) | 127V-265VAC (Phase-Neutral) |
| Rated Frequency | 50/60Hz |
| Output Contact (GRV8-05) | 1SPDT (10A) |
| Output Contact (GRV8-05D) | 2SPDT (8A) |
| Overvoltage Threshold (U>) | 2% to 20% of Un |
| Undervoltage Threshold (U<) | -20% to -2% of Un |
| Asymmetry Threshold (Asy) | 8% |
| Delay Time (Tt) | 0.1s to 10s |
| Voltage Measurement Accuracy | <1% |
| Mounting | 1-MODULE, DIN rail |
| Dimensions (approx.) | 18mm (width) x 95mm (height) x 64mm (depth) |
| Protection Feature | Sealed |
| Certification | CE, RoHS, CB |
9. Warranty and Support
GEYA products are manufactured to high-quality standards and are certified to required industry standards, including CE, CB, and RoHS. For specific warranty terms and conditions, please refer to your purchase documentation or contact GEYA customer support. Technical assistance is available through authorized distributors or the manufacturer's official channels.
10. User Tips
- Optimal Settings: When setting the over/undervoltage and asymmetry thresholds, consider the typical voltage fluctuations in your electrical system to avoid nuisance tripping while ensuring adequate protection.
- Delay Time: Utilize the adjustable delay time (Tt) to prevent immediate tripping during momentary voltage dips or surges, which can be common in some industrial environments.
- Regular Checks: Periodically test the functionality of the relay if your application allows, to ensure it responds correctly to simulated fault conditions.
