1. Introduction
The SINOTIMER STVP-932 is an advanced three-phase intelligent voltage protector designed to provide comprehensive protection for electrical equipment against various power supply anomalies. This device features a digital display for real-time voltage monitoring and offers adjustable parameters for over-voltage, under-voltage, voltage unbalance, phase sequence, zero line break, and phase failure protection. Its self-resetting capability ensures continuous operation and enhanced system reliability.
2. Safety Information
- Installation and maintenance should only be performed by qualified electricians.
- Ensure the main power supply is disconnected before any installation, wiring, or maintenance work.
- Verify that the voltage and current ratings of the protector match your application requirements.
- Do not operate the device if it shows signs of damage.
- Always follow local electrical codes and regulations.
3. Product Overview
3.1 Features
- Over-voltage protection
- Under-voltage protection
- Voltage display (separate ABC phase volt measurement)
- Three-phase voltage unbalance protection
- Phase sequence protection (reverse phase protection)
- Zero line break protection
- Phase failure protection
- Adjustable over-voltage protection value
- Adjustable over-voltage recovery value
- Adjustable over-voltage protection action time
- Adjustable under-voltage protection value
- Adjustable under-voltage recovery value
- Adjustable under-voltage protection action time
- Adjustable 3-phase voltage unbalance protection value
- Adjustable 3-phase voltage unbalance protection action time
- Adjustable delay time after power-on
- Adjustable fault recovery delay time
- Reset mode selection
- Fault inquiry function
- Factory data reset function
3.2 Components
The STVP-932 features a clear digital display, control buttons for setting parameters, and robust terminals for secure wiring.
4. Specifications
| Parameter | Value |
|---|---|
| Model Number | STVP-932 |
| Power Supply | 3*230V / 400V AC 50/60Hz |
| Max. Loading Power | 50A, 63A, or 80A (model dependent) |
| Over-voltage Protection Range | 221V~300V-OFF (Adjustable, Default: 280V) |
| Over-voltage Recovery Range | 220V~299V (Default: 250V) |
| Over-voltage Action Time | 0.1~10 seconds (Adjustable, Default: 0.2s) |
| Under-voltage Protection Range | 150V~219V-OFF (Adjustable, Default: 160V) |
| Dimensions (L x W x H) | 72 x 65 x 80mm |
| Material | ABS + Electronic Components |
| Color | White |
5. Setup and Installation
The STVP-932 is designed for DIN rail mounting within an electrical enclosure. Ensure proper ventilation and clearance around the device.
5.1 Mounting
Attach the protector to a standard 35mm DIN rail by snapping the clips on the back of the device onto the rail. Ensure it is securely fastened.
5.2 Wiring Diagram
Follow the wiring diagram carefully to connect the STVP-932 to your three-phase electrical system. The device has 'IN' terminals for incoming power (L1, L2, L3, N) and 'OUT' terminals for protected outgoing power (L1, L2, L3, N).
Connection Steps:
- Connect the incoming three-phase power supply (L1, L2, L3, N) to the 'IN' terminals of the STVP-932.
- Connect the 'OUT' terminals (L1, L2, L3, N) of the STVP-932 to the load or downstream circuit protection devices (e.g., air circuit breaker).
- Ensure all connections are tight and secure to prevent loose contacts and overheating.
6. Operating Instructions
6.1 Digital Display
The digital display shows real-time voltage readings for each phase (A, B, C). In normal operation, it cycles through these readings or displays the current status.
6.2 Setting Parameters
Use the 'SET' button to enter the parameter setting mode. The 'Up' and 'Down' arrow buttons are used to navigate through parameters and adjust their values. Press 'SET' again to confirm a setting and move to the next parameter, or to exit the setting mode.
Adjustable parameters include:
- Over-voltage protection value (Uvo)
- Over-voltage recovery value
- Over-voltage protection action time
- Under-voltage protection value (Uve)
- Under-voltage recovery value
- Under-voltage protection action time
- Three-phase voltage unbalance protection value
- Three-phase voltage unbalance protection action time
- Delay time after power-on
- Fault recovery delay time
6.3 Reset Mode Selection
The device supports different reset modes. Consult the English manual included in the package for detailed instructions on selecting the appropriate reset mode for your application.
6.4 Fault Inquiry and Factory Reset
The device allows for fault inquiry to review past protection events. A factory data reset option is also available to restore all parameters to their default settings.
7. Troubleshooting
This section provides guidance on common issues you might encounter with the STVP-932.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device trips frequently | Voltage fluctuations (over/under voltage), phase unbalance, incorrect settings. | Check power supply stability. Adjust protection thresholds (Uvo, Uve) and action times. Verify load balance across phases. |
| No display/No power | No input power, incorrect wiring, internal fault. | Ensure main power is on. Check input wiring (L1, L2, L3, N). If wiring is correct and power is present, contact support. |
| Device does not reset | Continuous fault condition, incorrect reset mode setting. | Ensure the fault condition has cleared. Check the configured reset mode and recovery delay time. |
| Incorrect voltage readings | Loose connections, sensor issue. | Verify all wiring connections are secure. If the issue persists, contact support. |
8. Maintenance
- Regularly inspect the device for any physical damage or signs of overheating.
- Keep the device clean and free from dust and debris. Use a dry, soft cloth for cleaning.
- Periodically check all wiring connections to ensure they remain tight and secure.
- Do not attempt to open or repair the device yourself, as this may void any warranty and pose a safety risk.
9. User Tips
Based on common usage and feedback, here are some tips for optimizing your experience with the STVP-932:
- Initial Setup: When first installing, set the protection values slightly wider than your expected normal operating range to avoid nuisance tripping, then fine-tune as needed.
- Monitoring: Regularly check the digital display to understand the typical voltage behavior of your system, which can help in setting optimal protection parameters.
- Recovery Delay: Utilize the fault recovery delay time setting to prevent rapid on/off cycling of equipment during intermittent power issues, protecting sensitive loads.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your original point of purchase or the SINOTIMER customer service department. Keep your purchase receipt and product model number handy for faster assistance.
