1. Introduction
The GEYA GRV8-SV is a single-phase LCD digital display voltage relay designed for monitoring and protecting electrical systems against overvoltage and undervoltage conditions. This device provides reliable control for various applications, ensuring the safe operation of connected equipment.
1.1 Applications
- Control for connection of moving equipment (site equipment, agricultural equipment, refrigerated trucks).
- Normal/emergency power supply switching.
2. Safety Information
Please read this manual carefully before installation and operation. Failure to follow these instructions may result in equipment damage or personal injury. Installation and maintenance should only be performed by qualified personnel.
- Ensure the power supply is disconnected before any installation or wiring work.
- Verify that the voltage and current ratings of the relay match your application requirements.
- Protect the device from moisture, dust, and extreme temperatures.
- Do not open or attempt to repair the device; refer to qualified service personnel.
3. Product Overview
3.1 Features
- Controls its own supply voltage (True RMS measurement).
- Integrated LCD display for real-time voltage monitoring and settings.
- Measuring frequency range: 45Hz-65Hz.
- High voltage measurement accuracy: <1%.
- Compact 2-MODULE design for DIN rail mounting.
- Overvoltage and undervoltage protection with adjustable delay times.
- Two SPDT (Single Pole Double Throw) output contacts.
3.2 Components and Display
The GRV8-SV features a clear LCD and intuitive control buttons on its front panel, along with standard terminal connections.
Figure 1: Front View of GRV8-SV Voltage Relay
Figure 2: Angled View with Transparent Cover Open
Front Panel Controls:
- LCD Display: Shows current voltage, status (e.g., NORMAL), and parameter settings.
- R/T Button: Reset/Test button.
- MD Button: Mode button for navigating settings.
- Up (▲) Button: Increases parameter values.
- Down (▼) Button: Decreases parameter values.
- R LED: Indicates relay status.
Terminal Connections:
- A1(+), A2(-): Power supply input terminals.
- 11, 12, 14: First SPDT output contact.
- 21, 22, 24: Second SPDT output contact.
4. Setup
4.1 Mounting
The GRV8-SV is designed for DIN rail mounting (EN/IEC 60715). Ensure it is securely clipped onto the DIN rail in a suitable enclosure, protected from environmental factors.
Figure 3: DIN Rail Mounting Mechanism
4.2 Wiring Diagram
Connect the GRV8-SV according to the following diagram. Ensure all connections are tight (tightening torque: 0.4Nm) and use appropriate cable sizes (solid wire max. 1x2.5mm² or 2x1.5mm²; with sleeve max. 1x2.5mm² (AWG 12)).
Figure 4: GRV8-SV Wiring Diagram and Technical Parameters
Wiring Instructions:
- Connect the AC/DC 110V~240V power supply to terminals A1(+) and A2(-).
- Connect the monitored line (L and N) to the appropriate terminals as shown in the diagram for voltage sensing.
- Connect the load (KM - Contactor Coil) to the output contacts. For example, use 11 and 14 for Normally Open (NO) control, or 11 and 12 for Normally Closed (NC) control. Similarly for the second contact (21, 22, 24).
5. Operation
5.1 Initial Power-Up
Once wired, apply power to the A1-A2 terminals. The LCD will illuminate and display the current voltage. The relay will undergo a power-up delay before entering normal operation.
5.2 Parameter Setting
To adjust the protection parameters, use the MD, Up (▲), and Down (▼) buttons. Refer to the table below for parameter ranges and factory settings.
| Parameter | Range | Step Value | Factory Settings |
|---|---|---|---|
| Over voltage value | 65V-300V, OFF | 1V | 253V |
| Over voltage recovery value | 60V-295V | 1V | 248V |
| Under voltage value | OFF, 65V-300V | 1V | 187V |
| Under voltage recovery value | 70V-305V | 1V | 192V |
| Voltage fault action time | 0.1s-20s | 0.1s | 2s |
| Power on delay time | 0.5s-300s | 0.1s | 0.5s |
| Reset time | 0.5s-300s | 0.1s | 1s |
| Fault reset | ON-OFF | — | ON |
5.3 Operation Description
The relay continuously monitors the input voltage. If the voltage deviates from the set overvoltage or undervoltage thresholds for the configured action delay time, the output relays will trip to protect the connected equipment.
Testing Relay Action: A short press (0.5s) of the R/T button can test the relay action. This function is only available when the power supply is normal.
Figure 5: Functions Diagram (Timing for Over/Undervoltage Protection)
The diagram illustrates the timing sequences for various events:
- To: Overvoltage tripping delay.
- Tu: Undervoltage tripping delay.
- Tr: Reset delay.
- Tp: Power up delay.
6. Maintenance
The GRV8-SV voltage relay is designed for long-term, maintenance-free operation. However, periodic checks are recommended:
- Ensure all wiring connections remain secure and free from corrosion.
- Keep the device clean and free from dust and debris.
- Periodically verify the functionality of the relay using the test button.
7. Troubleshooting
If the device is not functioning as expected, consider the following:
- No display/No power: Check the power supply to A1-A2 terminals. Ensure connections are correct and secure.
- Relay not tripping: Verify the set overvoltage/undervoltage thresholds and delay times. Ensure they are appropriate for the monitored voltage. Check the wiring to the load.
- Relay tripping unexpectedly: Check for unstable power supply or transient voltage fluctuations. Adjust delay times if necessary to avoid nuisance tripping.
- Incorrect voltage reading: Ensure the input voltage is within the specified operating range.
8. Specifications
Figure 6: GRV8-SV Dimensions (mm)
| Parameter | Value |
|---|---|
| Function | Over voltage, under voltage |
| Rated supply voltage (Un) | AC/DC110V~240V |
| Rated supply frequency | 50/60Hz (45~65Hz) |
| Operation voltage range | 50V~350V |
| Burden | AC max. 3VA |
| Over operation value | 65V-300V, OFF |
| Under operation value | OFF, 65V-300V |
| Over/under voltage action delay | 0.1s~20s |
| Power-up delay | 0.5s~300s |
| Reset time | 0.5s~300s |
| Measurement error | <1% |
| Output | 2xSPDT |
| Current rating | 8A/AC1 |
| Switching voltage | 250VAC/24VDC |
| Electrical life (AC1) | 1x105 |
| Mechanical life | 1x106 |
| Operating temperature | -20°C ~ +60°C |
| Storage temperature | -35°C ~ +75°C |
| Mounting | DIN rail EN/IEC 60715 |
| Protection degree | IP40 for front panel/IP20 terminals |
| Overvoltage category | III |
| Pollution degree | 2 |
| Max. cable size | Solid wire max.1x2.5 or 2x1.5 / with sleeve max.1x2.5 (AWG 12) |
| Tightening torque | 0.4Nm |
| Dimensions (H x W x D) | 90mm x 36mm x 70mm |
| Weight | 100g |
| Standards | EN 60255-1, IEC60947-5-1 |
| Certification | CE, RoHS, CCC |
9. User Tips
- For critical applications, consider using a backup protection device or regularly testing the relay's functionality.
- When setting delay times, balance between immediate protection and avoiding false trips due to minor fluctuations.
- Always ensure proper ventilation around the device to prevent overheating, especially in enclosed panels.
10. Warranty & Support
For warranty information, technical support, or service inquiries, please contact GEYA customer service or your local distributor. Keep your purchase receipt for warranty claims.
A detailed user manual in PDF format is available for download. Please refer to the official GEYA website or the product page for the document titled "User manual (PDF)" (e.g., https://manuals.plus/m/f4936ebe510342ec7a46acec4bf699f5adba28aa6778c19786a632213c9e2342).
