GEYA GRI8 Series Current Monitoring Relay Instruction Manual

1. Introduction

The GEYA GRI8 Series Current Monitoring Relay is designed for reliable monitoring of current flow in various electrical systems. This device is essential for protecting equipment from both overcurrent and undercurrent conditions, ensuring stable operation and preventing damage. It is suitable for applications such as monitoring heating in rail-switches, heating cables, and the consumption of single-phase motors.

The GRI8 series offers different models for specific monitoring needs:

• GRI8-01: Overcurrent Protection
• GRI8-02: Undercurrent Protection
• GRI8-03: Overcurrent or Undercurrent Protection
• GRI8-04: Overcurrent and Undercurrent Protection

2. Product Overview

The GEYA GRI8 Current Monitoring Relay is a compact, 1-module device designed for DIN rail mounting. It features flexible adjustment options and clear status indicators for ease of use and monitoring.

Key Features:

• Adjustable Delay: A time delay of 0.5 - 10 seconds can be set to eliminate short current peaks, preventing nuisance tripping.
• Flexible Current Range Adjustment: Six selectable current ranges (0.05-0.5A, 0.1-1A, 0.2-2A, 0.5-5A, 0.8-8A, 1.6-16A) are available via a potentiometer for precise application matching.
• Universal Supply: Compatible with AC 24 - 240 V or DC 24 V power supplies.
• Output Contact: Equipped with 1 SPDT (Single Pole Double Throw) 10A/AC1 output contact.
• Status Indication: Relay status is clearly indicated by a green LED for supply and a red LED for relay status.
• DIN Rail Mounting: Easy installation on standard DIN rails.
• Current Scanning: Possible to use for current scanning from a current transformer.

Figure 2.1: GEYA GRI8-04 Current Monitoring Relay (Front View)

Figure 2.2: GEYA GRI8-04 Current Monitoring Relay (Side View with Function Diagram)

Figure 2.3: Adjustable Current Ranges (0.05A to 16A)

Figure 2.4: Monitoring Current (AC) of Loading Equipment - GRI8 Models

3. Specifications

Figure 3.1: Technical Parameters

Model and Connotation:

Figure 3.2: Model and Connotation

The model number indicates the series, design number, and current range:

• GRI8 Series: Base product series.
• Design Number:
  • 01: Overcurrent
  • 02: Undercurrent
  • 03: Overcurrent or Undercurrent
  • 04: Over/Undercurrent in windows mode
• Current Range (AC):
  • 0.5: 0.05-0.5A
  • 1: 0.1-1A
  • 2: 0.2-2A
  • 5: 0.5-5A
  • 8: 0.8-8A
  • 16: 1.6-16A

4. Installation and Setup

Dimensions:

Figure 4.1: Dimensions (mm)

Mounting:

The GRI8 series relays are designed for 1-MODULE DIN rail mounting. Ensure the DIN rail is securely installed in your electrical panel before mounting the relay.

Panel Diagram:

Figure 4.2: Panel Diagram (GRI8-01, GRI8-02, GRI8-03, GRI8-04)

The front panel includes:

• Un (Green LED): Supply Indication
• R (Red LED): Relay Status Indication
• Iset / Imax / Imin / Func: Potentiometers for setting current thresholds and function (depending on model).
• Tt: Potentiometer for Time Delay Setting (0.5-10s).
• Tr: Potentiometer for Power Up Delay Setting (0.1-10s).

Figure 4.3: Detailed Control Panel (GRI8-01 and GRI8-03)

5. Operation

The GRI8 series relays continuously monitor the current in the connected circuit. When the monitored current exceeds or falls below the set thresholds (depending on the model and settings), the relay will activate its output contact after the configured time delay.

Setting Current Thresholds:

Use the 'Iset', 'Imax', or 'Imin' potentiometer on the front panel to set the desired current threshold for overcurrent or undercurrent detection. Refer to the model-specific diagrams for precise settings.

Setting Time Delays:

• Tt (Tripping Delay): Adjust this potentiometer to set the delay (0.5 - 10 seconds) before the relay trips once a fault condition is detected. This helps to ignore momentary current fluctuations.
• Tr (Power Up Delay): Adjust this potentiometer to set the delay (0.1 - 10 seconds) after power-up before the monitoring function becomes active.

Status Indication:

• The Green LED (Un) indicates that the device is powered on.
• The Red LED (R) indicates the status of the output relay. It will illuminate when the relay is active due to a detected current anomaly.

Function Diagrams:

Figure 5.1: Functions Diagram for GRI8 Models

These diagrams illustrate the behavior of each GRI8 model under different current conditions, including hysteresis and time delays (Tr: Power up delay, Tt: Tripping delay).

6. Wiring Diagrams

Proper wiring is crucial for the safe and correct operation of the current monitoring relay. Always ensure power is disconnected before performing any wiring.

General Wiring:

Figure 6.1: General Wiring Diagram

Terminal Connections:

• A1-A2: Supply Voltage Terminals (Un)
• B1-B2: Monitoring Current Terminals (for AC current monitoring)
• 11-12-14: 1 SPDT Output Contact

GRI8-01 Wiring Example:

Figure 6.2: GRI8-01 Wiring Case Example

In this example, the GRI8-01 is used to monitor the current of a cooker and water heater. The output contacts behave as follows:

• 11-14: Normally Open (NO). After an overcurrent event, this contact will close.
• 11-12: Normally Closed (NC). After an overcurrent event, this contact will disconnect.

7. Troubleshooting

If the current monitoring relay is not functioning as expected, consider the following general troubleshooting steps:

• No Power Indication (Green LED off): Check the supply voltage connections (A1-A2) and ensure the power supply is active and within the specified voltage range (AC 24-240V or DC 24V).
• Relay Not Activating/Deactivating:
  • Verify the current monitoring connections (B1-B2) are correct and the load current is flowing through them.
  • Check the set current thresholds (Iset/Imax/Imin) to ensure they are appropriate for the monitored load.
  • Review the time delay settings (Tt, Tr) as these can affect when the relay responds.
  • Ensure the correct GRI8 model is being used for the desired overcurrent/undercurrent function.
• Intermittent Tripping: Adjust the 'Tt' (Tripping Delay) to a slightly longer duration to prevent tripping from momentary current spikes that are not actual fault conditions.
• Incorrect Current Reading: Ensure the current transformer (if used) is correctly installed and matched to the relay's current range.

If issues persist, consult a qualified electrician or contact GEYA technical support.

8. User Tips

Based on common inquiries, here are some tips for using your GEYA Current Monitoring Relay:

• Understand Your Needs: Before installation, clearly identify whether you need overcurrent, undercurrent, or both types of protection. This will help in selecting the correct GRI8 model (e.g., GRI8-01 for overcurrent, GRI8-02 for undercurrent, GRI8-04 for both).
• Accurate Current Range Selection: Use the potentiometer to select the current range that best matches your application's normal operating current. This ensures optimal sensitivity and protection.
• Time Delay Adjustment: Experiment with the 'Tt' (Tripping Delay) setting to find the right balance between immediate fault detection and avoiding false trips due to transient current changes.
• Not a Power Controller: Please note that this device is a current monitoring relay for protection, not a phase angle power controller. It does not regulate power output but rather detects current anomalies to trigger an alarm or shut-off.

9. Maintenance

The GEYA GRI8 Current Monitoring Relay is designed for long-term, maintenance-free operation. However, periodic checks are recommended:

• Visual Inspection: Periodically inspect the device for any signs of physical damage, loose connections, or discoloration.
• Connection Integrity: Ensure all wiring connections remain tight and secure.
• Functionality Test: If possible and safe to do so, periodically test the relay's tripping function by simulating an overcurrent or undercurrent condition to ensure it responds correctly.
• Cleaning: Keep the device clean and free from dust and debris to ensure proper ventilation and operation of indicators. Use a dry, soft cloth for cleaning.

Always disconnect power before performing any maintenance or inspection.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the official GEYA website or contact your authorized GEYA distributor. Ensure you have your product model number and purchase details available when seeking support.

11. About GEYA

GEYA Electric, established in 2007, is a private-owned enterprise specializing in the research, manufacture, and sales of low voltage electrical and automatic controlling products. The company is located in Wenzhou City and is committed to top quality and constant innovation. GEYA products are certified to required industry standards, including CCC, CE, CB, SAA, SEMKO, TUV, and RoHS.