1. Introduction
The GEYA GRI8-05 Current Monitoring Relay is designed for monitoring AC or AC/DC current in various applications. This manual provides essential information for the safe and efficient installation, operation, and maintenance of the device.
1.1. Product Variants
- GRI8-05A: Designed for AC Current Measurement.
- GRI8-05B: Designed for AC/DC Current Measurement.
1.2. Applications
This device is suitable for monitoring heating in rail-switches, heating cables, and the consumption of single-phase motors. It effectively indicates current flow and can be used in various industrial and domestic settings.
1.3. Key Features
- Through-Center Design: Allows for convenient installation without needing to disconnect the current circuit.
- Monitoring Modes: Supports both over-current and under-current monitoring, configurable via jumper settings.
- Universal Testing: Available in specifications for both AC and AC/DC universal testing.
- Expandable Range: Incorporates an isolation current transformer, allowing connection of an external current transformer to expand the monitoring current range.
- Universal Supply: Operates with a wide supply voltage of AC/DC 24 - 240 V.
- Status Indication: Relay status is clearly indicated by an LED.
- Compact Design: 1-MODULE size, suitable for DIN rail mounting.
2. Specifications
The following table details the technical specifications for the GEYA GRI8-05 Current Monitoring Relay:
| Parameter | GRI8-05A (AC Measurement) | GRI8-05B (AC/DC Measurement) |
|---|---|---|
| Function | AC measurement | AC/DC measurement |
| Supply terminals | A1-A2 | A1-A2 |
| Rated supply voltage | AC/DC 24-240V | AC/DC 24-240V |
| Rated supply frequency | 50/60Hz, 0 | 50/60Hz, DC |
| Burden | max 25VA | max 25VA |
| Supply voltage tolerance | -15%; +10% | -15%; +10% |
| Current range | 2A-20A | 2A-20A |
| Current frequency | AC 50Hz | AC 50Hz, DC |
| Setting accuracy | potentiometer | potentiometer |
| Supply indication | green LED | green LED |
| Setting accuracy | 10% | 10% |
| Hysteresis | 5% | 5% |
| Output | 1×SPDT | 1×SPDT |
| Current rating | 10A/AC1 | 10A/AC1 |
| Switching voltage | 250VAC/24VDC | 250VAC/24VDC |
| Min. breaking capacity DC | 500mW | 500mW |
| Output indication | red LED | red LED |
| Mechanical life | 1×107 | 1×107 |
| Electrical life (AC1) | 1×105 | 1×105 |
| Operating temperature | -20°C ~ +55°C | -20°C ~ +55°C |
| Storage temperature | -35°C ~ +75°C | -35°C ~ +75°C |
| Mounting/DIN rail | DIN rail EN/IEC 60715 | DIN rail EN/IEC 60715 |
| Protection degree | IP20 | IP20 |
| Operating position | any | any |
| Max. cable size (mm2) | 1x2.5 or 2x1.5, 0.4N·m | 1x2.5 or 2x1.5, 0.4N·m |
| Dimensions (mm) | 90 x 18 x 64 | 90 x 18 x 64 |
| Weight | 61g | 61g |
| Certification | CE, CB, ROHS | |
3. Setup and Installation
The GEYA GRI8-05 Current Monitoring Relay is designed for easy installation on a DIN rail.
3.1. Dimensions and Panel Diagram
Refer to the diagram below for the physical dimensions and panel layout of the GRI8-05 series.
The diagram shows the front panel with the GEYA logo, Un (green LED), R (red LED), and the current setting potentiometer (2A-20A). Dimensions are provided in millimeters, indicating a height of 95mm, width of 18mm, and depth of 64mm for GRI8-05A, and 88mm depth for GRI8-05B.
3.2. Wiring Diagram
Proper wiring is crucial for the safe and correct operation of the current monitoring relay. Follow the diagrams below carefully.
The wiring diagram illustrates the connections for the supply terminals (A1, A2), output contacts (11, 12, 14), and the current monitoring path. For monitored currents ≤ 20A, the load wire passes directly through the relay's current transformer. For monitored currents > 20A, an external CT (Current Transformer) is required for transformation.
Wiring Steps:
- Connect the power supply (AC/DC 24-240V) to terminals A1 and A2.
- For direct current monitoring (≤ 20A), pass the load wire directly through the integrated current transformer of the relay.
- For higher current monitoring (> 20A), connect an external current transformer (CT) and pass the load wire through the external CT. Connect the output of the external CT to the relay's monitoring input.
- Connect the controlled device (LOAD) to the output contacts 11, 12, and 14 as required (11-14 for normally open, 11-12 for normally closed).
- Ensure all connections are secure and correctly insulated.
4. Operation
The GEYA GRI8-05 relay monitors current flow and activates its output based on configured over-current or under-current thresholds.
4.1. Setting Current Thresholds
- Use the potentiometer on the front panel to set the desired current monitoring range (2A-20A).
- The setting accuracy is 10% with a hysteresis of 5%.
4.2. Monitoring Modes
The relay can be configured for either over-current or under-current monitoring using internal jumpers (refer to the product's internal diagram or specific model instructions for jumper settings).
4.3. Status Indicators
- Green LED (Un): Indicates the presence of supply voltage.
- Red LED (R): Indicates the status of the output relay (ON/OFF).
4.4. Function Diagram
The function diagram illustrates the behavior of the relay's output contacts (11-14) in response to the monitored current (I) relative to the set threshold (Iset) and hysteresis.
This diagram shows how the output (Y1-Y2) changes state when the monitored current (I) crosses the set threshold (Iset), taking into account the hysteresis. For example, in over-current mode, the output might activate when current exceeds Iset and de-activate when it falls below Iset minus hysteresis.
5. Maintenance
The GEYA GRI8-05 Current Monitoring Relay is designed for long-term, reliable operation with minimal maintenance. However, periodic checks can help ensure optimal performance and longevity.
5.1. General Care
- Keep the device clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Ensure proper ventilation around the device to prevent overheating.
- Regularly check terminal connections for tightness to prevent loose contacts, which can lead to intermittent operation or damage.
5.2. Environmental Conditions
- Operate the device within the specified operating temperature range of -20°C to +55°C.
- Store the device within the specified storage temperature range of -35°C to +75°C.
- Avoid exposing the device to excessive moisture or corrosive environments.
6. Troubleshooting
If you encounter issues with your GEYA GRI8-05 Current Monitoring Relay, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Green LED (Un) is OFF | No supply voltage or incorrect connection. | Check the supply voltage to terminals A1-A2 and ensure correct wiring. Verify the voltage is within AC/DC 24-240V. |
| Red LED (R) is not changing state | Incorrect current setting, faulty load, or incorrect monitoring mode. | Verify the current setting on the potentiometer. Check the load for proper operation. Ensure the correct over/under current monitoring mode is selected (if applicable via jumpers). |
| Inaccurate current reading/monitoring | Improper calibration, external CT issues, or interference. | Ensure the potentiometer is set correctly. If using an external CT, verify its specifications and connection. Check for strong electromagnetic interference near the device. |
| Relay not activating/deactivating | Output contact wiring error, relay failure, or current not reaching threshold. | Check the wiring to the output contacts (11, 12, 14). Confirm the monitored current is actually crossing the set threshold (considering hysteresis). If all else fails, the relay might be faulty and require replacement. |
If the problem persists after attempting these solutions, please contact GEYA customer support for further assistance.
7. User Tips
- Energy Flow Monitoring: The GRI8-05 can be effectively used to monitor both energy injection into and consumption from a grid. By setting appropriate over-current and under-current thresholds, you can detect deviations from normal energy flow, which is useful for identifying system imbalances or unexpected loads/sources.
- Optimizing Settings: When setting the current range, consider the normal operating current of your system and add a buffer for the hysteresis. This prevents nuisance tripping or missed events.
- External CT for High Currents: Always use an appropriately rated external Current Transformer (CT) when monitoring currents exceeding the relay's direct measurement capacity (20A) to ensure accurate and safe operation.
8. Frequently Asked Questions (FAQ)
- Q: Can this relay be used to monitor both energy injection and consumption in a grid?
- A: Yes, the GEYA GRI8-05 Current Monitoring Relay can be configured to detect both over-current (indicating consumption or injection above a threshold) and under-current (indicating consumption or injection below a threshold). By carefully setting the current range and monitoring mode, it can help identify if energy is being injected into or consumed from the grid beyond expected levels.
- Q: What is the difference between GRI8-05A and GRI8-05B?
- A: The GRI8-05A model is designed specifically for AC current measurement, while the GRI8-05B model supports both AC and DC current measurement, offering more versatility.
- Q: Do I need an external current transformer?
- A: The GRI8-05 can directly monitor currents up to 20A. If your application requires monitoring currents greater than 20A, an external current transformer (CT) must be used to expand the monitoring range.
- Q: What do the green and red LEDs indicate?
- A: The green LED (Un) indicates that the device is receiving power supply. The red LED (R) indicates the status of the output relay, typically illuminating when the monitored current crosses the set threshold and the relay activates.
9. Warranty and Support
GEYA products are manufactured to high-quality standards and come with a standard warranty against defects in materials and workmanship. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official GEYA website.
For technical support, troubleshooting assistance, or inquiries regarding product service, please contact GEYA customer service through their official channels. Ensure you have your product model and any relevant purchase information ready when contacting support.
Contact Information:
- Web: www.geya.net
- E-mail: sale@cngeya.com
10. Product Overview Video
Watch this video for a general overview of GEYA's manufacturing process and product range, including relays.
11. Additional Resources
For more detailed information and guides, you may refer to the official user manual PDF: